Peremennye Zvezdy (Variable Stars) 27, No. 2, 2007 Received 2 December; accepted 20 March.
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Institute of Astronomy, Bulgarian Academy of Sciences, Sofia, Bulgaria
E-mail: dinko@astro.bas.bg, vaspop@mail.bg
One of the most extensive sky surveys in the recent years is the Northern Sky Variability Survey (NSVS, Wozniak et al., 2004a). Light curves of about 14000000 objects with instrumental magnitudes between 8 and 15.5 are included in the database of that survey, for the period April 1999 - March 2000, covering all of the Northern hemisphere and reaching in the South.
Usually, search for new variables follows a standard procedure: a sample of stars from other sources (IR, X-ray surveys) is selected by some characteristics and then this selection is checked for variability in the NSVS database. This procedure does not reflect the whole variety of variable stars in the NSVS.
Several studies based on NSVS data have been published. Preliminary results of ROTSE-I (Akerlof et al., 2000) identified 1781 periodic variables of different types. The catalogue of red variables (Wozniak et al., 2004b) contains the greatest number so far: 8678 variable stars, 6474 of them newly discovered. Kinemuchi et al. (2006) studied 1188 RR Lyr stars, Wils, Lloyd and Bernhard (2006) identified 785 variables of the same type. The catalogue of Gettel et al. (2006) contains 1022 contact binaries. Otero et al. (2004, 2005a, 2005b, 2006a, 2006b) give information about new eclipsing variables from the NSVS. The NSVS database is also used for confirmation and determination of parameters of the objects from the GCVS and NSV catalogues (Kazarovets et al., 2005; Antipin et al., 2005).
Akerlof et al. (2000) estimate the total number of variables to be discovered using the NSVS as 32000, Samus (2006) gives an estimate of tens of thousands expected variables. One of the aims of our research is to estimate the total number of variables which can be extracted from the NSVS database.
As mentioned above, the search procedure adopted to create earlier catalogues makes use of data external to the NSVS to preselect variability candidates.
To look for different types of variables, we rely only upon internal NSVS data. We select an area on the sky and check for variability in the NSVS database. Our test area covers 46 deg in Andromeda, its coordinates are: 23 and (2000.0). The galactic latitude is in the range. The total number of NSVS light curves in this area is and every star has between 1 and 4 light curves, the mean value being 1.875 light curves per star. Our search is based on the variability parameter :
(1) |
where is the scatter of measurements in the light curve and is the median value of the error of a single measurement. Both values are present in the on-line distribution of NSVS data in Sky Database for Objects in Time-Domain - the SkyDOT pages.
There are light curves in the selected field with , at which we cut off our manual examination. As our detection threshold, we accepted the amplitude for long-period or irregular variability and the amplitude plus the period for periodic variables.
Period analysis was performed with the PERANSO code (http://www.peranso.com) by the ANOVA method, most suitable for light curves with two minima. Table 1 summarizes the data for detected variables. Its first column presents ordinal numbers of variables detected in our search, the next two columns are identification numbers of the variables' light curves in the NSVS and the variability parameter of the respective light curves.
Examination of all light curves revealed curves with variability, corresponding to variable stars (Table 2). In Table 2, the first column presents the number of the star from Table 1. We identified the variables with the Tycho/Tycho2 (for brighter stars) or USNO B1.0 (for fainter stars) catalogues, the identifications are presented in the second column. Coordinates from the 2MASS catalogue (USNO coordinates, if the 2MASS identification is not reliable) are in the third and fourth columns. As a consequence of low angular resolution of the observations in the NSVS database ( per pixel), some of the objects are blended and this makes it difficult to exactly determine to which star a certain light curve belongs. In such cases, NSVS coordinates may be considerably different from 2MASS coordinates. Next columns contain the instrumental stellar magnitude in maximum , the amplitude of variations in the light curve, the period , and the variability type. The NSVS data do not allow a detailed classification of the GCVS level of detail, so we adopted the somewhat simplified classification of Akerlof et al. (2000) and Wozniak et al. (2004b). The last column contains star names from the GCVS, NVS catalogues and those from Wozniak et al. (2004b) if they exist. A star number in column 1 marked with an asterisk refers to additional remarks following the Table.
Variables revealed in our search are distributed as follows:
The light curves of new variable stars are presented in Fig. 1 (irregular or semiregular variables), Fig. 2 (eclipsing binaries), and Fig. 3 (other periodic variables).
We subdivide all the light curves into 19 subsets for different ranges of (Table 3). The first column of Table 3 contains the range for the subset. The next column is the number of light curves, , belonging to the subset. Columns 3 and 4 contain the cumulative number of light curves, , and . The number of light curves with variability, , cumulative number, , and its logarithm, , are presented in the next three columns. The last column shows the predicted number of light curves with variability, , for the respective subset. The data from Table 3 are graphically presented in Fig. 4, as the function:
Diamonds in Fig. 4 represent data for subsets with . Some of the light curves of variable stars with multiple light curves have , such data are displayed as crosses.The relation (2) for lower values of can be linearly approximated as:
(3) |
Its extrapolation to gives an estimate for the expected number of light curves with variability in the selected field. Thus, the predicted total number of curves with detectable variability is . This number correspond to variable stars, i.e. 23 variables can be detected if the search covers the rest of the range. Thus, the concentration of variables per light curve in the field appears to be:
(4) |
If we assume this approximation to be valid for all NSVS data, and the concentration to be uniform for the survey, then an estimate of the total number of variable stars can be made. There are about light curves in the NSVS, and the total number of variable stars that can be expected to be extracted from the survey is:
(5) |
If we take into consideration only really detected variables, i.e. , then , and this number corresponds to the total number of variables , which may be considered a lower limit to the total number of variables detectable in the NSVS.
100 - 200 | 11 | 11 | 1.041 | 1 | 1 | 0.000 | |
50 - 100 | 25 | 36 | 1.556 | 6 | 7 | 0.845 | |
20 - 50 | 71 | 107 | 2.029 | 14 | 21 | 1.322 | |
10 - 20 | 121 | 228 | 2.358 | 21 | 42 | 1.623 | |
8 - 10 | 88 | 316 | 2.500 | 19 | 61 | 1.785 | |
6 - 8 | 123 | 439 | 2.642 | 31 | 92 | 1.964 | |
5 - 6 | 130 | 569 | 2.755 | 23 | 115 | 2.061 | |
4 - 5 | 271 | 840 | 2.924 | 28 | 143 | 2.155 | |
3 - 4 | 682 | 1522 | 3.182 | 30 | 173 | 2.238 | |
2.6 - 3 | 470 | 1992 | 3.299 | 10 | 183 | 2.262 | |
2.2 - 2.6 | 1019 | 3011 | 3.479 | 19 | 202 | 2.305 | |
1.8 - 2.2 | 2543 | 5554 | 3.745 | 26 | 228 | 2.358 | 228 |
1.6 - 1.8 | 2082 | 7636 | 3.883 | 9 | 237 | 2.375 | 237 |
1.5 - 1.6 | 1447 | 9083 | 3.958 | 5 | 242 | 2.384 | 242 |
1.3 - 1.5 | 4030 | 13113 | 4.118 | 5 | 247 | 2.393 | 253 |
1.1 - 1.3 | 8560 | 21673 | 4.336 | 7 | 254 | 2.405 | 269 |
0.9 - 1.1 | 16665 | 38338 | 4.584 | 1 | 255 | 2.407 | 288 |
0.7 - 0.9 | 11956 | 50294 | 4.702 | 0 | 255 | 2.407 | 298 |
0.4 - 0.7 | 1661 | 51955 | 4.716 | 0 | 255 | 2.407 | 299 |
Total : | 51955 | 255 | 299 |
This publication makes use of the data from the Northern Sky Variability Survey created jointly by the Los Alamos National Laboratory and University of Michigan. The NSVS was funded by the Department of Energy, the National Aeronautics and Space Administration, and the National Science Foundation. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research also has made use of the SIMBAD database, operated at CDS, Strasbourg, France, NASA's Astrophysics Data System Abstract Service, and the USNOFS Image and Catalogue Archive operated by the United States Naval Observatory, Flagstaff Station (http://www.nofs.navy.mil/data/fchpix/). The authors thank Dr. N. Samus for critically reviewing the manuscript.
References:
Akerlof, C., Amrose, S., Balsano, R., et al. 2000, Astron. J., 119, 1901
Antipin, S., Pastukhova, E., and Samus, N., 2005, IBVS, No. 5613
Dahlmark, L., 1999, IBVS, No. 4734
Gettel, S., Geske, M., and McKay, T., 2006, Astron. J., 131, 621
Kazarovets, E., Pastukhova, E., and Samus, N., 2005, PZ, 25, 2
Kazarovets, E., Samus, N., Durlevich, O. et al., 2006, IBVS, No. 5721
Khruslov, 2005, PZS, 5, 6
Kinemuchi, K., Smith, H., Wozniak, P., and McKay, T., 2006, Astron. J., 132, 1202
Otero, S., Hoogeveen, G., and Wils, P., 2006a, IBVS, No. 5674
Otero, S., and Wils, P., 2005a, IBVS, No. 5630
Otero, S., Wils, P., and Dubovsky, P., 2004, IBVS, No. 5570
Otero, S., Wils, P., and Dubovsky, P., 2005b, IBVS, No. 5586
Otero, S., Wils, P., Hoogeveen, G., and Dubovsky, P., 2006b, IBVS, No. 5681
Samus, N., 2006, ASPC, 349, 3
Samus, N., Durlevich, O. et al., 2004, Combined General Catalogue of Variable Stars
Wils, P., Lloyd, Ch., and Bernhard, K., 2006, MNRAS, 368, 1757
Wozniak, P., Vestrand, P., Akerlof, C. et al., 2004a, Astron. J., 127, 2436
Wozniak, P., Williams, S., Vestrand, W., and Gupta, V., 2004b, Astron. J., 128, 2965
No | ID | No | ID | No | ID | No | ID | ||||
1 | 6186115 | 3.167 | 43 | 3547609 | 5.000 | 69 | 6208993 | 2.133 | 95 | 6217788 | 4.667 |
2 | 6186577 | 3.083 | 43 | 6152420 | 4.333 | 70 | 3556454 | 20.667 | 96 | 3563428 | 1.896 |
3 | 6187334 | 4.545 | 43 | 6202530 | 5.348 | 70 | 3602473 | 19.100 | 96 | 3608642 | 1.933 |
4 | 6187630 | 1.714 | 44 | 3548903 | 6.364 | 70 | 6161158 | 7.636 | 96 | 6166548 | 1.940 |
5 | 6139890 | 3.020 | 44 | 3595661 | 9.750 | 70 | 6212453 | 21.455 | 96 | 6218514 | 2.269 |
5 | 6189126 | 2.741 | 44 | 6154088 | 5.200 | 71 | 3558091 | 4.286 | 97 | 3563745 | 1.615 |
6 | 6188888 | 4.400 | 45 | 3552715 | 1.137 | 71 | 6210669 | 4.389 | 97 | 3608929 | 2.846 |
7 | 6189231 | 111.636 | 45 | 6202233 | 1.526 | 72 | 3557127 | 9.800 | 97 | 6166219 | 1.268 |
8 | 6189117 | 5.600 | 46 | 3552235 | 5.769 | 73 | 3559429 | 5.000 | 97 | 6218135 | 1.900 |
9 | 6141665 | 1.556 | 46 | 6202829 | 38.769 | 73 | 6210124 | 6.818 | 98 | 3565288 | 1.396 |
10 | 6141226 | 5.625 | 47 | 3552035 | 2.680 | 74 | 3558846 | 9.000 | 98 | 6216130 | 1.608 |
10 | 6190599 | 3.833 | 47 | 6203386 | 3.158 | 74 | 6211799 | 5.500 | 99 | 3565538 | 20.000 |
11 | 6189799 | 78.615 | 48 | 3550366 | 10.500 | 75 | 3559834 | 1.722 | 99 | 6215912 | 18.727 |
12 | 6190823 | 2.182 | 48 | 3596992 | 6.800 | 75 | 6211628 | 1.938 | 100 | 3564585 | 5.400 |
13 | 6190476 | 1.926 | 48 | 6155303 | 3.063 | 76 | 3560782 | 2.949 | 100 | 6217647 | 3.800 |
14 | 6191048 | 3.909 | 48 | 6205797 | 4.412 | 76 | 6210513 | 3.633 | 101 | 3608657 | 2.348 |
15 | 6191796 | 7.000 | 49 | 3553878 | 1.154 | 77 | 3560802 | 13.214 | 101 | 6168680 | 3.333 |
16 | 6192152 | 4.480 | 49 | 6203881 | 1.289 | 77 | 6210777 | 14.231 | 102 | 3564994 | 7.833 |
17 | 6192307 | 23.889 | 50 | 3550888 | 1.964 | 78 | 3559333 | 5.000 | 102 | 6218809 | 7.000 |
18 | 6144773 | 2.286 | 50 | 3597481 | 1.851 | 78 | 6212638 | 6.100 | 103 | 3566117 | 7.214 |
19 | 6193197 | 6.645 | 50 | 6155931 | 1.868 | 79 | 3560610 | 1.200 | 103 | 6217539 | 4.467 |
20 | 6192361 | 2.200 | 50 | 6206475 | 1.887 | 79 | 6211350 | 1.867 | 104 | 3564685 | 1.333 |
21 | 6193521 | 8.643 | 51 | 3553020 | 49.722 | 80 | 3603453 | 2.857 | 104 | 3609749 | 2.195 |
22 | 6193347 | 4.650 | 51 | 6205585 | 99.385 | 80 | 6163539 | 2.071 | 104 | 6219862 | 1.674 |
23 | 6193574 | 7.091 | 52 | 3554519 | 11.111 | 81 | 3560869 | 2.813 | 105 | 3610070 | 2.700 |
24 | 6145821 | 5.182 | 52 | 6204296 | 10.813 | 81 | 6211762 | 3.200 | 106 | 3567233 | 2.083 |
24 | 6195309 | 6.583 | 53 | 3554901 | 62.786 | 82 | 3561118 | 3.917 | 106 | 6220235 | 7.333 |
25 | 6145959 | 3.056 | 53 | 6204430 | 70.615 | 82 | 6211539 | 4.000 | 107 | 3569143 | 9.900 |
25 | 6195466 | 4.700 | 54 | 3553463 | 4.417 | 83 | 3560181 | 6.385 | 107 | 6219568 | 9.091 |
26 | 6145748 | 2.400 | 54 | 6205838 | 3.917 | 83 | 6212739 | 6.667 | 108 | 3568410 | 15.250 |
26 | 6195243 | 8.200 | 55 | 3554667 | 3.909 | 84 | 3560867 | 2.278 | 109 | 3568744 | 1.103 |
27 | 6146625 | 9.818 | 55 | 6205337 | 3.000 | 84 | 6212163 | 2.563 | 109 | 3613282 | 1.833 |
28 | 6146897 | 12.500 | 56 | 3552095 | 3.762 | 85 | 3559745 | 9.355 | 110 | 3570253 | 2.625 |
29 | 3547289 | 4.229 | 56 | 3598584 | 3.786 | 85 | 3605370 | 13.103 | 111 | 3613265 | 1.692 |
29 | 6195086 | 11.465 | 56 | 6157531 | 4.000 | 85 | 6214417 | 9.733 | 112 | 3570601 | 8.308 |
30 | 3546966 | 1.679 | 57 | 3555211 | 0.974 | 86 | 3560628 | 5.958 | 113 | 3614244 | 8.091 |
30 | 6195550 | 1.506 | 57 | 6205431 | 1.202 | 86 | 6213406 | 6.100 | 114 | 3571956 | 8.176 |
31 | 6147628 | 2.200 | 58 | 3554560 | 20.000 | 87 | 3562336 | 6.600 | 115 | 3572834 | 2.326 |
31 | 6197257 | 1.875 | 58 | 6207069 | 25.556 | 87 | 6212191 | 6.500 | 116 | 3572667 | 8.810 |
32 | 3547061 | 15.182 | 59 | 3556338 | 3.200 | 88 | 3560466 | 47.067 | 117 | 3572711 | 4.571 |
32 | 6196777 | 20.700 | 59 | 6205354 | 4.400 | 88 | 6164110 | 22.059 | 118 | 3615389 | 6.545 |
33 | 3547859 | 9.273 | 60 | 3553940 | 1.758 | 88 | 6215818 | 85.583 | 119 | 3573890 | 11.500 |
33 | 6197085 | 10.300 | 60 | 6157013 | 3.075 | 89 | 3562846 | 6.000 | 120 | 3572275 | 8.364 |
34 | 3547537 | 33.444 | 60 | 6207739 | 1.370 | 89 | 6213143 | 5.636 | 120 | 3616412 | 3.200 |
34 | 6198369 | 49.857 | 61 | 3553359 | 3.700 | 90 | 3561083 | 12.647 | 121 | 3616581 | 10.100 |
35 | 3548459 | 11.000 | 61 | 3599707 | 8.182 | 90 | 6164281 | 9.720 | 122 | 3573034 | 2.462 |
35 | 6198178 | 6.455 | 61 | 6157883 | 4.700 | 90 | 6215983 | 11.625 | 122 | 3617166 | 4.214 |
36 | 6151020 | 53.615 | 62 | 3552946 | 5.769 | 91 | 3562822 | 4.583 | 123 | 3574480 | 1.568 |
37 | 6150652 | 2.476 | 62 | 3599331 | 6.000 | 91 | 6214723 | 4.917 | 124 | 3574249 | 5.909 |
37 | 6200568 | 2.500 | 62 | 6158399 | 6.941 | 92 | 3561438 | 1.568 | 124 | 3618229 | 6.500 |
38 | 3547362 | 2.338 | 63 | 3555230 | 7.300 | 92 | 3606866 | 4.867 | 125 | 3575069 | 2.379 |
38 | 6151022 | 2.189 | 63 | 6207329 | 9.500 | 92 | 6165437 | 1.941 | 126 | 3575950 | 17.000 |
38 | 6200982 | 1.375 | 64 | 3557230 | 4.308 | 92 | 6217269 | 2.000 | 127 | 3618839 | 2.400 |
39 | 3547577 | 6.294 | 64 | 6207305 | 4.238 | 93 | 3561748 | 5.636 | 128 | 3619146 | 3.545 |
39 | 3594632 | 7.143 | 65 | 3557969 | 5.364 | 93 | 3607121 | 13.400 | 129 | 3576200 | 30.273 |
39 | 6150834 | 5.308 | 65 | 6207074 | 5.900 | 93 | 6165627 | 11.818 | 130 | 3619554 | 6.000 |
39 | 6200769 | 5.167 | 66 | 3558064 | 1.414 | 93 | 6217509 | 6.273 | 131 | 3577456 | 3.800 |
40 | 3550226 | 2.429 | 66 | 6207285 | 1.840 | 94 | 3562295 | 3.333 | 132 | 3577684 | 3.214 |
40 | 6199438 | 5.846 | 67 | 3555958 | 2.521 | 94 | 3607613 | 3.364 | 133 | 3577652 | 1.605 |
41 | 3548394 | 3.625 | 67 | 6159146 | 2.143 | 94 | 6165629 | 3.067 | 133 | 3621269 | 4.625 |
41 | 6150988 | 6.280 | 67 | 6210116 | 2.385 | 94 | 6217511 | 2.846 | 134 | 3578849 | 4.143 |
41 | 6200937 | 1.941 | 68 | 3557654 | 4.167 | 95 | 3562913 | 5.167 | 135 | 3578756 | 3.600 |
42 | 3547157 | 1.842 | 68 | 6209964 | 4.167 | 95 | 3608209 | 7.364 | 136 | 3621797 | 2.803 |
42 | 6152131 | 2.417 | 69 | 3559411 | 1.889 | 95 | 6165877 | 5.938 |
No | USNO B1.0/ | [2000] | [2000] | Type | Name | |||
Tycho2 ID | [mag] | [mag] | [days] | |||||
1 | 1387-0480726 | 23 00 04.67 | 48 47 36.1 | 12.00 | 0.31 | 195.9 | SR | |
2 | 3626-00107-1 | 23 00 23.92 | 48 18 09.7 | 10.40 | 0.28 | 19.974 | EA | |
3 | 3626-00834-1 | 23 01 02.15 | 47 53 44.0 | 10.10 | 0.15 | 52.9 | SR+L | |
4 | 3626-00396-1 | 23 01 35.51 | 48 39 11.3 | 12.55 | 0.25 | 20.345 | EB | |
5* | 1348-0502527 | 23 01 48.63 | 44 48 29.1 | 12.91 | 0.64 | 0.73893 | EB | |
6 | 3626-01166-1 | 23 02 22.43 | 47 21 29.2 | 9.88 | 0.14 | 24.34 | SR+L | |
7* | 1368-0523132 | 23 02 33.14 | 46 49 48.4 | 9.44 | 2.78 | 265.5 | M | NSV14395 |
8 | 1381-0572277 | 23 02 52.10 | 48 06 10.1 | 11.66 | 0.46 | 52.3 | SR+L | W8401 |
9 | 1342-0511619 | 23 03 25.74 | 44 12 13.5 | 13.05 | 0.35 | 2.6670 | EA | |
10 | 3622-02298-1 | 23 03 43.68 | 46 29 15.6 | 10.87 | 0.15 | 22.46 | SR+L | |
11* | 3631-00011-1 | 23 03 50.99 | 48 51 53.5 | 9.64 | 2.57 | 198.1 | M | AZ And |
12 | 1373-0593303 | 23 04 15.60 | 47 19 51.9 | 12.45 | 0.30 | SR+L | ||
13 | 1383-0527110 | 23 04 18.55 | 48 19 48.0 | 13.00 | 0.30 | 0.20085 | RRAB | |
14 | 3627-00110-1 | 23 04 22.82 | 47 03 18.5 | 10.33 | 0.14 | 60.24 | SR+L | |
15 | 3627-00436-1 | 23 05 22.84 | 47 40 34.8 | 11.16 | 0.57 | 0.9351 | EA | AA And |
16 | 1385-0485929 | 23 06 04.06 | 48 35 24.8 | 11.70 | 0.35 | 0.23385 | RRAB | |
17 | 1382-0557956 | 23 06 06.37 | 48 15 55.5 | 11.50 | 0.30 | 61.1 | SR+L | W8420 |
18 | 1342-0512794 | 23 06 21.64 | 44 12 18.3 | 12.68 | 0.30 | 1.0974 | EA | |
19* | 1372-0594633 | 23 06 36.23 | 47 15 30.6 | 12.30 | 0.46 | 0.39678 | EW | |
20 | 1393-0484769 | 23 06 38.12 | 49 23 27.5 | 11.73 | 0.47 | 1.2121 | EA | |
21 | 1372-0594793 | 23 06 54.93 | 47 16 36.3 | 11.23 | 0.35 | 78.5 | SR+L | W8425 |
22 | 1384-0496799 | 23 07 15.07 | 48 28 41.3 | 11.80 | 0.35 | SR+L | ||
23* | 1380-0585624 | 23 07 18.40 | 48 05 36.2 | 10.62 | 0.25 | 143.4 | SR+L | |
24 | 3228-00350-1 | 23 07 29.23 | 44 29 50.0 | 10.15 | 0.25 | 37.31 | SR+L | |
25 | 1345-0502344 | 23 07 37.30 | 44 31 18.1 | 11.44 | 0.25 | L | ||
26 | 1351-0505564 | 23 07 41.88 | 45 09 31.2 | 9.04 | 0.56 | SR | ||
27 | 1341-0510466 | 23 08 07.81 | 44 10 45.7 | 10.07 | 0.36 | SR+L | W8435 | |
28 | 1340-0493850 | 23 08 19.80 | 44 00 47.9 | 11.38 | 0.76 | 98.2 | SR+L | |
29 | 1390-0488955 | 23 09 15.37 | 49 01 32.8 | 12.10 | 1.80 | 290.9 | M | W8444 |
30 | 1382-0559992 | 23 09 19.93 | 48 14 47.5 | 13.56 | 0.39 | 0.5864 | EB | |
31 | 1352-0513026 | 23 09 35.25 | 45 16 44.6 | 12.70 | 0.25 | 27.064 | C: | |
32* | 3627-01580-1 | 23 10 12.43 | 47 34 14.2 | 9.15 | 0.40 | 0.9375 | EA | |
33 | 1382-0560936 | 23 10 50.28 | 48 15 49.2 | 9.56 | 0.31 | L | ||
34* | 1370-0565053 | 23 11 30.06 | 47 02 52.6 | 10.86 | 1.44 | M | ||
35 | 3627-01393-1 | 23 11 47.20 | 48 03 18.3 | 10.20 | 0.45 | SR+L | ||
36 | 1340-0495435 | 23 12 23.52 | 44 05 33.8 | 10.70 | 0.36 | SR+L | W8461 | |
37 | 1351-0507811 | 23 12 33.59 | 45 11 58.8 | 11.97 | 0.28 | SR+L | ||
38 | 1351-0507944 | 23 12 53.26 | 45 06 03.3 | 12.73 | 0.27 | 31.1 | SR+L | |
39 | 1354-0521070 | 23 12 53.23 | 45 29 13.2 | 10.86 | 0.36 | 58.6 | SR+L | |
40 | 1386-0488556 | 23 13 20.02 | 48 39 26.6 | 12.15 | 0.58 | SR+L | W8469 | |
41* | 3623-02323-1 | 23 13 22.90 | 46 08 51.1 | 11.62 | 0.69 | 2.7676 | EA | TT And |
42 | 3229-02131-1 | 23 13 26.27 | 44 01 26.1 | 11.00 | 0.10 | 0.16878 | DS | |
43 | 1343-0517147 | 23 13 52.37 | 44 20 08.7 | 11.64 | 0.35 | L | ||
44 | 3229-02271-1 | 23 15 31.46 | 44 11 25.1 | 9.34 | 0.23 | L | ||
45 | 1387-0489759 | 23 16 03.21 | 48 46 35.6 | 12.70 | 0.25 | L | ||
46 | 3640-00992-1 | 23 16 09.86 | 48 01 29.9 | 10.67 | 0.20 | 0.61128 | RRAB | |
47 | 1374-0597426 | 23 16 22.09 | 47 29 09.4 | 11.80 | 0.30 | L | ||
48 | 3229-01054-1 | 23 16 52.99 | 44 29 18.3 | 11.20 | 0.46 | 0.7426 | EB | |
49 | 1385-0492074 | 23 17 26.14 | 48 33 06.1 | 12.70 | 0.15 | 0.45366 | RRAB | DE And |
50* | 1344-0510547 | 23 17 29.50 | 44 26 14.9 | 12.85 | 0.25 | 0.45559 | EW | |
51* | 1367-0520136 | 23 17 59.60 | 46 45 12.3 | 9.42 | 3.05 | 308.9 | M | AO And |
52* | 3644-02114-1 | 23 18 02.35 | 48 46 58.3 | 10.82 | 0.58 | 0.71121 | AC And | |
53 | 1389-0492848 | 23 18 18.82 | 48 57 31.4 | 8.90 | 2.86 | M | AI And | |
54 | 1368-0531134 | 23 18 20.89 | 46 53 36.3 | 10.55 | 0.18 | 43.7 | SR+L | |
55 | 3640-00047-1 | 23 18 40.26 | 48 11 21.1 | 10.13 | 0.14 | SR | DF And | |
56 | 3229-01483-1 | 23 18 58.37 | 44 05 48.5 | 11.16 | 0.19 | 44.6 | RV | |
57 | 1385-0492948 | 23 18 59.18 | 48 31 30.0 | 13.60 | 0.30 | 0.9786 | EA | V452 And |
58 | 1368-0531664 | 23 19 31.36 | 46 52 25.8 | 10.98 | 1.23 | 266.4 | SR+L | W8498 |
59* | 3644-02160-1 | 23 19 31.93 | 49 27 24.9 | 9.34 | 0.18 | SR+L | ||
60* | 3636-00729-1 | 23 19 32.55 | 45 55 32.0 | 12.22 | 0.60 | 4.279 | EA | NSV 14500 |
61 | 3229-00049-1 | 23 19 45.40 | 44 49 29.5 | 8.83 | 0.28 | L | ||
62 | 3229-00048-1 | 23 19 50.52 | 44 07 33.4 | 11.49 | 0.43 | 0.33271 | EW | |
63 | 3640-00752-1 | 23 19 58.89 | 47 14 34.6 | 9.08 | 0.30 | SR | EU And | |
64 | 1387-0492673 | 23 21 00.87 | 48 46 09.6 | 12.30 | 0.80 | 241.7 | SR+L | |
65 | 3644-00437-1 | 23 21 17.37 | 49 28 46.7 | 9.70 | 0.25 | L | ||
66 | 1394-0495072 | 23 21 27.18 | 49 25 39.4 | 11.98 | 0.12 | SR+L | ||
67 | 1358-0513837 | 23 21 45.32 | 45 52 08.6 | 12.68 | 0.46 | 1.5098 | EA | |
68 | 1372-0603608 | 23 22 32.36 | 47 15 41.3 | 10.53 | 0.20 | 50.9 | SR+L | |
69 | 1392-0493896 | 23 23 00.63 | 49 14 33.7 | 13.05 | 0.40 | 0.41255 | EW | |
70 | 1346-0505774 | 23 23 04.84 | 44 37 05.5 | 9.78 | 0.67 | SR+L | W8522 | |
71 | 1371-0592715 | 23 23 05.80 | 47 06 51.9 | 11.63 | 0.35 | 56.7 | SR+L | |
72 | 3636-00338-1 | 23 23 14.17 | 45 24 58.9 | 8.73 | 0.29 | SR | EV And | |
73 | 1384-0506412 | 23 23 33.36 | 48 27 10.7 | 9.78 | 0.45 | SRA | BT And | |
74 | 3636-01830-1 | 23 24 01.81 | 46 52 12.6 | 8.85 | 0.39 | L | NSV26077 | |
75 | 3640-01137-1 | 23 24 29.12 | 47 43 50.1 | 11.55 | 0.10 | 1.6116 | EA | |
76 | 1392-0494655 | 23 24 30.19 | 49 12 56.7 | 12.32 | 0.48 | SR+L | ||
77* | 1390-0497457 | 23 24 38.66 | 49 03 01.9 | 10.75 | 0.58 | 239.1 | SR+L | DH And |
78 | 3636-02029-1 | 23 24 41.26 | 46 38 26.3 | 9.15 | 0.21 | L | ||
79 | 3640-00731-1 | 23 24 48.92 | 48 30 07.3 | 12.45 | 0.20 | 1.2138 | EA | |
80 | 3242-00444-1 | 23 24 50.69 | 43 34 52.9 | 11.52 | 0.17 | 8.230 | C: | |
81 | 1384-0507301 | 23 25 07.63 | 48 25 02.6 | 11.35 | 0.17 | SR+L | ||
82 | 1387-0494785 | 23 25 10.66 | 48 44 44.2 | 10.70 | 0.16 | 31.1 | SR+L | |
83 | 1372-0605032 | 23 25 12.63 | 47 14 48.6 | 10.67 | 0.43 | 57.8 | SR+L | |
84 | 1381-0587069 | 23 25 19.25 | 48 07 45.7 | 11.45 | 0.18 | SR+L | ||
85* | 1357-0528214 | 23 25 41.71 | 45 42 04.6 | 12.02 | 1.42 | SR+L | V338 And | |
86 | 1370-0571459 | 23 25 44.81 | 47 05 14.0 | 11.62 | 0.49 | SR+L | W8534 | |
87 | 3644-01974-1 | 23 26 11.53 | 49 13 15.0 | 9.40 | 0.22 | 112.4 | SR+L | |
88* | 1352-0519966 | 23 26 42.58 | 45 14 56.7 | 9.26 | 2.68 | 262.2 | M | AL And |
89* | 1389-0497399 | 23 26 56.38 | 48 57 21.3 | 11.78 | 0.42 | 3.3892 | IS | DI And |
90 | 3637-00416-1 | 23 27 06.68 | 45 33 22.0 | 11.27 | 0.61 | 0.38044 | EW | LO And |
91* | 1378-0620232 | 23 27 37.99 | 47 48 01.7 | 10.60 | 0.20 | SR+L | ||
92 | 3242-00507-1 | 23 27 52.08 | 44 54 15.0 | 12.22 | 0.36 | 0.38542 | RRC | |
93 | 3242-00009-1 | 23 28 08.07 | 44 56 21.1 | 9.90 | 0.46 | SR+L | ||
94* | 3637-00396-1 | 23 28 27.49 | 45 22 40.3 | 10.63 | 0.42 | 1.7176 | EA/RS | |
95* | 1356-0529574 | 23 28 56.89 | 45 38 29.4 | 10.53 | 0.24 | SR+L | ||
96 | 1354-0527514 | 23 29 33.51 | 45 26 23.3 | 12.63 | 0.58 | 10.063 | EA | |
97 | 1359-0512348 | 23 29 33.62 | 45 59 09.4 | 12.82 | 0.32 | 0.4556 | EW | |
98 | 1386-0497150 | 23 29 43.21 | 48 36 57.8 | 12.90 | 0.40 | 0.6945 | EA | |
99* | 1389-0498655 | 23 29 47.01 | 48 57 19.0 | 9.90 | 0.57 | 193.8 | SR+L | DL And |
100 | 3641-01548-1 | 23 29 53.81 | 46 58 08.3 | 9.35 | 0.20 | L | ||
101 | 1335-0492761 | 23 30 34.31 | 43 30 42.4 | 11.71 | 0.22 | SR+L | ||
102 | 3637-01152-1 | 23 30 37.25 | 46 24 04.2 | 10.62 | 0.29 | 0.09966 | DS | |
103 | 1381-0590162 | 23 30 49.96 | 48 11 31.9 | 10.92 | 0.48 | 63.9 | SR+L | |
104 | 1352-0521597 | 23 30 55.26 | 45 16 23.5 | 13.81 | 0.67 | 3.2041 | C: | |
105 | 3243-01131-1 | 23 32 01.32 | 43 49 20.4 | 8.58 | 0.12 | 0.38956 | E | V0389 And |
106 | 3637-01335-1 | 23 32 41.34 | 46 47 57.5 | 10.67 | 0.23 | 2.84822 | EA | |
107 | 3645-02066-1 | 23 33 39.95 | 48 49 05.9 | 9.25 | 0.49 | ZAND | Z And | |
108* | 1363-0512296 | 23 34 07.67 | 46 20 02.3 | 10.63 | 2.97 | M | V339 And | |
109 | 1346-0510292 | 23 35 12.33 | 44 39 33.9 | 13.72 | 0.42 | 0.36169 | EW | |
110 | 1374-0607334 | 23 35 28.51 | 47 28 25.4 | 12.05 | 0.18 | 64.4 | SR | |
111 | 1337-0495784 | 23 35 33.34 | 43 46 56.6 | 13.30 | 0.30 | 0.36346 | EW | |
112 | 1369-0548757 | 23 36 03.75 | 46 55 46.2 | 10.87 | 0.44 | SR+L | W8573 | |
113 | 3243-00962-1 | 23 36 27.78 | 44 07 24.2 | 10.43 | 0.47 | 1.5580 | EA | |
114 | 3641-00151-1 | 23 36 45.01 | 48 40 15.6 | 11.38 | 0.57 | 0.9862 | EB | AD And |
115 | 1388-0498738 | 23 37 38.14 | 48 53 26.5 | 12.70 | 0.40 | 78.9 | SR | |
116 | 1384-0513395 | 23 37 38.48 | 48 24 11.9 | 12.20 | 1.20 | INSB | BM And | |
117 | 1382-0578479 | 23 37 45.69 | 48 13 22.9 | 11.14 | 0.24 | SR+L | ||
118* | 1336-0497796 | 23 37 55.42 | 43 36 36.5 | 10.44 | 0.48 | SR+L | ||
119 | 1392-0501449 | 23 38 40.21 | 49 12 23.4 | 10.48 | 0.55 | 121.6 | SR+L | W8586 |
120 | 3243-00348-1 | 23 38 48.75 | 44 24 45.4 | 9.27 | 0.35 | 2.0232 | EA | V392 And |
121 | 1340-0505196 | 23 39 06.29 | 44 03 06.0 | 9.40 | 0.52 | SR+L | ||
122 | 1354-0531767 | 23 39 12.43 | 45 27 51.7 | 12.85 | 0.63 | 0.33802 | EW | |
123 | 3642-02010-1 | 23 39 51.91 | 47 45 01.8 | 12.70 | 1.50 | 1.6324 | EA | EX And |
124* | 1348-0518558 | 23 40 40.76 | 44 48 55.9 | 9.26 | 0.26 | L | ||
125 | 1372-0613113 | 23 40 42.27 | 47 14 26.0 | 12.00 | 0.30 | SR+L | ||
126 | 3642-02398-1 | 23 41 29.68 | 47 35 43.8 | 8.22 | 0.40 | 95.3 | SRD | WY And |
127* | 1337-0498239 | 23 41 43.33 | 43 45 17.1 | 12.11 | 0.17 | 0.51885 | EW | |
128* | 1341-0523884 | 23 41 54.99 | 44 10 40.8 | 10.48 | 0.20 | BY | HH And | |
129 | 3638-01097-1 | 23 42 09.08 | 46 24 34.0 | 10.14 | 0.87 | SR+L | W8599 | |
130 | 3244-00262-1 | 23 42 29.52 | 43 46 01.8 | 10.27 | 0.24 | SR+L | ||
131 | 1378-0628992 | 23 42 57.30 | 47 49 20.1 | 11.14 | 0.23 | SR+L | ||
132 | 1384-0516099 | 23 42 58.31 | 48 27 16.0 | 11.15 | 0.20 | SR+L | ||
133 | 1356-0536414 | 23 43 47.32 | 45 40 45.4 | 12.23 | 0.40 | L | ||
134 | 1381-0598307 | 23 44 18.90 | 48 08 50.1 | 11.10 | 0.17 | SR+L | ||
135 | 3638-01617-1 | 23 44 53.55 | 45 41 11.5 | 11.06 | 0.39 | 23.183 | EA | WW And |
136* | 1335-0498073 | 23 44 59.42 | 43 31 25.0 | 13.20 | 1.45 | L |
5: Information in the VSX database (reported by J.S. Shaw, D. Hou).
7: NSV14395=W8400, Mira type, with and .
11: AZ And=W8405.
19: Discovered by Gettel et al. (2006).
23: Information in the VSX database (discovered by M. Nicholson).
32: The other name is SAO 52758.
34: Very big amplitude , but not found as variable by Wozniak et al. (2004b).
41: The period in the GCVS is .
50: Visual binary, separation , the other component with the 2MASS coordinates: 23172958, +442622 5. The NSVS data accuracy is insufficient to determine which component varies.
51: AO And=W8491, the period in the GCVS is .
52: A multiple-period star. The primary period in the GCVS is , but this period cannot be found in the NSVS data. The third GCVS period based on the NSVS data is .
59: The other name is SAO 52908.
60: The NSV coordinates are shifted by approximately from the NSVS position.
77: DH And=W8526.
85: V338 And=W8533.
88: AL And=W8538.
89: The GCVS describes DI And as type IS (a rapidly changing irregular variable). Khruslov (2005) found a period .
91: USNO coordinates.
94: X-ray source 1RXS J232827.5 +452242.
95: USNO coordinates.
99: DL And=W8549.
108: V339 And=W8565.
118: Information in the VSX database (discovered by M. Nicholson).
124: Information in the VSX database (discovered by M. Nicholson).
127: The NSVS coordinates are influenced by a close object of similar brightness, USNO 1337-0498237.
128: X-ray source 1RXS J234155.0 +441047.
136: Discovered by Dahlmark (1999). The NSVS coordinates are influenced by a close object of similar brightness, USNO 1335-0498064.
Fig. 1. Light curves of irregular and semiregular variable stars. Title numbers correspond to those in Table 2. |
Fig. 2. Light curves of eclipsing binaries. Title numbers and periods correspond to those in Table 2. |
Fig. 3. Light curves of periodic variable stars. Title numbers and periods correspond to those in Table 2. |