Article in PDF |
"Peremennye Zvezdy", Prilozhenie, vol. 13, N 16 (2013) |
ISSN 2221–0474 |
Received: 12.04.2013; accepted: 5.12.2013
(E-mail for contact: khruslov@bk.ru)
|
Comments:
1. MinII = 12m.37: (1SWASP). From ROTSE-I/NSVS data, 12m.18–12m.37, MinII = 12m.31 in the R band.
2. MinII = 14m.96 (CV). From 1SWASP data, 14m.4–15m.6 (1SWASPmag); from ROTSE-I/NSVS data, 14m.5–15m.3 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
3. D = 0.07 P. 13m.6–14m.0 (R, NSVS). Combined brightness of three stars: GSC 2956-00357 (= var), USNO-A2.0 1275-06820889, and USNO-A2.0 1275-06820690 was measured in NSVS and 1SWASP data, the measured amplitudes are considerably underestimated.
4. J–K = 1.195 (2MASS). The SWASP data confirm the irregular variability of this variable (1SWASP J071431.54+462026.4).
5. MinII = 13m.83 (CV). From 1SWASP data, 13m.8–14m.05; from ROTSE-I/NSVS data, 13m.85–14m.05 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
6. D = 0.16 P. MinII = 14m.01 (CV). From 1SWASP data, 14m.0–14m.45; from ROTSE-I/NSVS data, 13m.95–14m.45 in the R band.
7. MinII = 13m.08 (1SWASP). From ROTSE-I/NSVS data, 12m.95–13m.1 in the R band; from CSS data, 12m.75:–12m.9: in the CV band.
8. MinII = 13m.2 (R). From 1SWASP data, 13m.2–13m.4, MinII = 13m.3 .
9. MinII = 13m.69 (CV). From 1SWASP data 13m.7–14m.2; from ROTSE-I/NSVS data, 13m.55–13m.95 in the R band.
10. J–K = 0.687 (2MASS), B–V = 1.453 (Tycho2). 1RXS J072141.1+493257. From ROTSE-I/NSVS data, 11m.1–11m.3 in the R band. According to NSVS data, the light elements are: JD(max) 2451500.695 + 0.44867×E. The light curve shape possibly varies.
11. MinII = 13m.71 (CV). From 1SWASP data, 13m.70–13m.80; from ROTSE-I/NSVS data, 13m.5–13m.6 in the R band. Combined brightness of two stars, USNO-A2.0 1275-06888047 and USNO-A2.0 1275-06887689, was measured in the NSVS.
12. MinII = 13m.69 (CV). From 1SWASP data, 13m.43–13m.66; from ROTSE-I/NSVS data, 13m.05–13m.15 in the R band. Combined brightness of two stars, GSC 2965-01569 (=var) and GSC 2965-01608, was measured in the NSVS and 1SWASP, the tabulated amplitudes are considerably underestimated. The star has a faint close companion 2MASS 07231301+4233386, unresolved in the CSS.
13. MinII = 12m.52 (1SWASP). From ROTSE-I/NSVS data, 12m.56–12m.75, MinII = 12m.74 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
14. MinII = 14m.21 (CV). From 1SWASP data, 14m.15–14m.5; from ROTSE-I/NSVS data, 14m.2–14m.7: in the R band.
15. MinII = 13m.15 (CV). From 1SWASP data, 13m.48–13m.62; from ROTSE-I/NSVS data, 13m.25–13m.4 in the R band. According to NSVS data, the light elements are: JD(min) 2451500.578 + 0.34062×E. The ROTSE data with photometric correction flags were kept for the analysis.
16. J–K = 1.303 (2MASS). IRAS 07235+5134. The ROTSE data with photometric correction flags were kept for the analysis. Type SR is also not excluded.
17. MinII = 13m.24 (CV). From 1SWASP data, 12m.87–12m.98, MinII = 12m.95; from ROTSE-I/NSVS data, 12m.95–13m.05 in the R band.
18. D = 0.13 P. MinII = 13m.40 (CV) From 1SWASP data, 13m.75–14m.1, MinII = 13m.85; from ROTSE-I/NSVS data, 13m.6–13m.95 in the R band. According to NSVS data, the light elements are: JD(min) 2451501.870 + 0.74707×E. The ROTSE data with photometric correction flags were kept for the analysis.
19. MinII = 14m.38 (CV). From 1SWASP data, 14m.5–15m.05, MinII = 15m.0; from ROTSE-I/NSVS data, 14m.3–14m.9 in the R band.
20. MinII = 14m.26 (CV). From 1SWASP data, 14m.2–14m.8, MinII = 14m.7; from ROTSE-I/NSVS data, 14m.1–14m.7, MinII = 14m.6 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
21. MinII = 13m.36 (CV). From 1SWASP data, 13m.25–13m.5; from ROTSE-I/NSVS data, 13m.2–13m.45 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
22. MinII = 14m.34 (CV). From 1SWASP data, 14m.34–14m.66, MinII = 14m.61 (1SWASPmag). The ROTSE data with photometric correction flags were kept for the analysis.
23. MinII = 13m.63 (CV). From 1SWASP data, 13m.7–13m.95; from ROTSE-I/NSVS data, 13m.6–13m.85 in the R band. According to NSVS data, the light elements are: JD(min) 2451500.765 + 0.27194×E.
24. MinII = 11m.80 (R). In our analysis of 1SWASP data, nights with a large scatter of data points around the light curve were disregarded.
25. D = 0.22 P. MinII = 14m.17 (CV). From 1SWASP data, 13m.8–14m.05; from ROTSE-I/NSVS data, 13m.8–14m.0 in the R band. Combined brightness of two stars, GSC 2967-00227 (=var) and GSC 2967-00606, was measured in the NSVS and 1SWASP, the measured amplitudes are too low. The ROTSE data with photometric correction flags were kept for the analysis.
26. D = 0.10 P. MinII = 14m.50 (CV). From 1SWASP data, 12m.15–12m.6. No period could be derived from NSVS data because of a small number of observations and their large uncertainties. Combined brightness of two stars, GSC 2967-00061 (=var) and GSC 2967-00443, was measured in the NSVS and 1SWASP, the corresponding amplitudes are somewhat too low. It is unclear why the 1SWASP observations result in brighter magnitudes for this star, not explainable with blending, see also No. 35. Some 1SWASP observations (not plotted) give magnitudes close to those measured in the CSS survey. The median magnitude in ROTSE-I/NSVS data is 14.m1.
27. The variability of TYC 2971 1335 1 was independently discovered by Sergey (2013). B–V = 0.055 (Tycho2), J–K = 0.242 (2MASS). From 1SWASP data, 11m.25–11m.65. The ROTSE data with photometric correction flags were kept for the analysis.
28. D = 0.20 P. MinII = 13m.56 (CV). Combined brightness of two stars, GSC 3410-01017 (=var) and GSC 3410-01216, was measured in the NSVS and 1SWASP, the tabulated amplitudes are considerably underestimated.
29. MinII = 13m.26 (CV). From 1SWASP data, 13m.3–13m.55, MinII = 13m.4; from ROTSE-I/NSVS data, 13m.45–13m.7, MinII = 13m.6 in the R band.
30. The variability of GSC 2963-00184 was independently reported by I. Sergey (Astrobloknot Team) in 2013 to the http://www.aavso.org/vsx/ database, on the base of ROTSE-1/NSVS and CSS data. MinII = 13.m85 (CV). J–K = 0.427 (2MASS). From 1SWASP data, 13m.75–14m.40, MinII = 14m.35; from ROTSE-I/NSVS data, 13m.65–14m.2, MinII = 14m.15 in the R band. According to NSVS data, the light elements are: JD(min) 2451450.613 + 0.292166×E. The ROTSE data with photometric correction flags were kept for the analysis.
31. D = 0.18 P. MinII = 13m.0 (1SWASP). From ROTSE-I/NSVS data, 13m.0–13m.5, MinII = 13m.1 in the R band; from CSS data, 12m.63–13m.18 (CV).
32. MinII = 12m.24 (1SWASP). From ROTSE-I/NSVS data, 12m.21–12m.32, MinII = 12m.31 in the R band.
33. MinII = 14m.21 (CV). From 1SWASP data, 13m.85–13m.95. The star's variability was first suspected from NSVS data, but, there being too few NSVS data points, with too high uncertainties, we could not get a reasonably good NSVS light curve for this variable.
34. The variability of GSC 3410-00265 was independently discovered by Palaversa et al. (2013) in the LINEAR Survey. From 1SWASP data, 13m.83–14m.18, MinII = 14m.17; from ROTSE-I/NSVS data, 14m.2–14m.6 in the R band. Combined brightness of two stars, GSC 3410-00265 (=var) and the faint neighbor USNO-A2.0 1350-07221103, was measured in the NSVS and 1SWASP, the measured amplitudes are somewhat uderestimated. According to CSS data, the depth of minima varies.
35. MinII = 13m.84 (CV). According to CSS data, the mean brightness varies. From 1SWASP data, 11m.55–11m.9, MinII = 11m.75; from ROTSE-I/NSVS data, 13m.8–14m.1 in the R band. The light curve shape possibly varies. It is unclear why the 1SWASP observations result in brighter magnitudes for this star, not explainable with blending, see No. 26. Some 1SWASP observations (not plotted) give magnitudes close to those measured in the CSS survey.
36. J–K = 0.674 (2MASS). The ROTSE data with photometric correction flags were kept for the analysis.
37. D = 0.08 P. MinII = 12m.76 (1SWASPmag). From ROTSE-I/NSVS data, 12.m2–12m.85 in the R band. A twice shorter period is not excluded.
38. MinII = 13m.43 (CV). J–K = 0.150 (2MASS). From 1SWASP data, 13m.5–13m.9, MinII = 13m.7; from ROTSE-I/NSVS data, 13m.6–14m.0 in the R band.
39. D = 0.12 P, d = 0.04 P. MinII = 11m.33: (1SWASP). From ROTSE-I/NSVS data, 11m.38–11m.63, MinII = 11m.44: in the R band.
40. D = 0.09P. MinII = 13m.38: (CV). Combined brightness of three stars: GSC 3410-01451 (=var), USNO-B1.0 1376-0227004, and GSC 3410-01895, was measured in NSVS and 1SWASP, the tabulated amplitudes are too low. Probably, the CSS did not resolve the pair consisting of GSC 3410-01451=var and USNO-B1.0 1376-0227004.
41. MinII = 13m.52 (CV). From 1SWASP data, 13m.64–13m.82, MinII = 13m.75; from ROTSE-I/NSVS data, 13m.72–13m.94 in the R band.
42. J–K = 0.710 (2MASS).
43. MinII = 13m.69 (CV). From 1SWASP data, 13m.27–13m.41; from ROTSE-I/NSVS data, 13m.3–13m.4 in the R band. Combined brightness of three stars: GSC 3407-02902 (=var), USNO-A2.0 1350-07260524, and USNO-A2.0 1350-07260699, was measured in NSVS and 1SWASP, our amplitudes are too low.
44. J–K = 0.735 (2MASS).
45. J–K = 0.721 (2MASS). From 1SWASP data, 12m.75–13m.15. The CSS data confirm the semiregular variability.
46. MinII = 13m.81 (CV). From 1SWASP data, 13m.85–14m.17, MinII = 14m.14; from ROTSE-I/NSVS data, 13m.7–14m.0 in the R band. Combined brightness of two stars, GSC 2972-00926 (=var) and GSC 2972-00725, was measured in NSVS and 1SWASP, the amplitudes we find are somewhat underestimated.
47. MinII = 12m.15 (CV) Combined brightness of two stars, TYC 2964 01200 1 (= var) and GSC 2964-01181, was measured in NSVS and 1SWASP, the amplitudes we found are considerably underestimated.
48. MinII = 12m.81 (1SWASP). From ROTSE-I/NSVS data, 12m.65–12m.85, MinII = 12m.80 in the R band.
49. MinII = 14m.42 (CV). From 1SWASP data, 14m.25–14m.65, MinII = 14m.6; from ROTSE-I/NSVS data, 14m.2–14m.6 in the R band.
50. MinII = 10m.12 (1SWASP). From ROTSE-I/NSVS data, 10m.15–10m.3 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
51. D = 0.07 P. MinII = 14m.14 (CV). From 1SWASP data, 14m.3–14m.8, MinII = 14m.75; from ROTSE-I/NSVS data, 14m.0–14m.5 in the R band.
52. MinII = 13m.49 (CV). From 1SWASP data, 13m.37–13m.72, MinII= 13m.68; from ROTSE-I/NSVS data, 13m.4–13m.75 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.
53. MinII = 13m.41 (CV). From 1SWASP data, 13m.23–13.m.32, MinII = 13m.30; from ROTSE-I/NSVS data, 13m.45–13m.65 in the R band.
54. IRAS 08028+4625. J–K = 1.289 (2MASS). From 1SWASP data, 12m.55–12m.9 (1SWASP). The ROTSE data with photometric correction flags were kept for the analysis.
55. D = 0.11 P. MinII= 13m.75 (CV). From 1SWASP data, 14m.0–14m.8; from ROTSE-I/NSVS data, 14m.0–14m.7 in the R band. According to NSVS data, the light elements are: JD(min) 2451450.685 + 2.1166×E. The ROTSE data with photometric correction flags were kept for the analysis. The star has a faint close companion 2MASS 08074864+4204043.
56. IRAS 08050+4652. J–K = 1.201 (2MASS), B–V = 1.824 (Tycho2). From 1SWASP data, 10m.47–11m.36 (1SWASP). Type SR is not excluded.
57. D = 0.22 P. MinII = 13m.61 (CV). From 1SWASP data, 13m.7–14m.25, MinII = 13m.8; from ROTSE-I/NSVS data, 13m.85–14m.35, MinII = 13m.95 in the R band.
58. MinII = 13m.20 (1SWASP). From ROTSE-I/NSVS data, 13m.20–13m.30 in the R band; from CSS data, 12m.78–12m.91 (CV). DSS images show GSC 2976-01659 elongated; it is probably a close visual binary unresolved in the CSS or in the USNO A2.0, B1.0, 2MASS, GSC 2.2, GSC 2.3 catalogs. Thus, the measured amplitude can be strongly underestimated.
59. The variability of GSC 2980-01109 was independently discovered by Palaversa et al. (2013) in the LINEAR Survey. MinII = 14m.57 (CV). From 1SWASP data, 14m.35–14m.80, MinII = 14m.75; from ROTSE-I/NSVS data, 14m.4–14m.8 in the R band.
60. MinII = 13m.46 (CV). From 1SWASP data, 13m.27–13m.44, MinII = 13m.42; from ROTSE-I/NSVS data, 13m.25–13m.5 in the R band.
61. 1RXS J081531.5+512959. From ROTSE-I/NSVS data, 12m.64–12m.79 in the R band. According to NSVS data, the light elements are: JD(max) 2451500.540 + 0.29761×E. The light curve shape varies.
62. MinII = 13m.37 (1SWASP). From ROTSE-I/NSVS data, 13m.25–13m.35 in the R band; from CSS data, 13m.1–13m.3 (CV).
63. J–K = 0.655 (2MASS). From ROTSE-I/NSVS data, 12m.65–12m.85 in the R band; from CSS data, 12m.4:–12m.8: (CV).
64. MinII = 13m.15 (CV). Combined brightness of two stars, GSC 3421-01203 (=var) and GSC 3421-01228, was measured in NSVS and 1SWASP, the measured amplitudes are somewhat underestimated.
65. MinII = 13m.87 (CV). From 1SWASP data, 13m.9–14m.2, MinII = 14m.15; from ROTSE-I/NSVS data, 13m.8–14m.1 in the R band. Combined brightness of two stars, GSC 2977-01458 (=var) and faint GSC 2977-00830, was measured in NSVS and 1SWASP, the measured amplitudes are somewhat underestimated.
66. J–K = 1.151 (2MASS). The ROTSE data with photometric correction flags were kept for the analysis.
67. From 1SWASP data, 14m.2–14m.4; from ROTSE-I/NSVS data, 13m.8–14m.0 in the R band. The light elements in the table are based on 1SWASP data (JD 2454000–2454600); the period 13.46 days is also not excluded. According to NSVS data, the light elements are: JD(max) 2451507.9 + 12.98×E. CSS data did not permit us to derive a period valid for the long time span of the observarions; probably both the period and the amplitude vary. J–K = 0.747 (2MASS).
68. The variability of GSC 2978-00622 was independently reported by I. Sergey (Astrobloknot Team) in 2013 to the http://www.aavso.org/vsx/ database, on the base of ROTSE-1/NSVS and CSS data. The eclipse in MinI is total, d = 0.08 P. MinII = 13m.83 (CV). From 1SWASP data, 13m.8–14m.2, MinII = 14m.17; from ROTSE-I/NSVS data, 13m.8–14m.2 in the R band. According to NSVS data, the light elements are: JD(min) 2451500.614 + 0.29636×E.
69. B–V = 2.097 (Tycho2), J–K = 1.159 (2MASS). IRAS 08274+4132.
70. MinII = 12m.68 (1SWASP). From ROTSE-I/NSVS data, 12m.46–12m.62 in the R band.
71. J–K = 0.503 (2MASS), B–V = 0.379 (Tycho2). From ROTSE-I/NSVS data, 12m.25–12m.35 in the R band. According to NSVS data, the light elements are: JD(min) 2451500.5 + 2.413×E. The ROTSE data with photometric correction flags were kept for the analysis.
72. B–V = 0.970 (Tycho2), J–K = 0.728 (2MASS). From 1SWASP data, 11m.7–11m.95 (1SWASP). The ROTSE data with photometric correction flags were kept for the analysis.
73. MinII = 13m.16 (1SWASPmag). From CSS data, 12m.65–12m.85, MinII = 12m.85 (CV); from ROTSE-I/NSVS data, 12m.94–13m.08, MinII = 13m.08 in the R band. According to NSVS data, the light elements are: JD(min) 2451500.660 + 0.34532×E.
74. The variability of GSC 3422-01397 was independently discovered by Palaversa et al. (2013) in the LINEAR Survey. MinII = 14m.97 (CV). Combined brightness of two stars, GSC 3422-01397 (=var) and GSC 3422-01612, was measured in the NSVS and 1SWASP, the amplitudes are somewhat underestimated.
75. MinII = 12m.30 (1SWASPmag). From ROTSE-I/NSVS data, 12m.28–12m.41, MinII = 12m.38 in the R band.
76. J–K = 0.686 (2MASS). Type EB is not excluded. From ROTSE-I/NSVS data, 12m.55–12m.7, MinII = 12m.65 or 12m.68–12m.8, MinII = 12m.8 in the R band. The ROTSE data with photometric correction flags were kept for the analysis.Remarks:
I present a discovery of 76 new variable stars. My search for variables was carried out in the publicly available data of the Northern Sky Variability Survey (NSVS , Woźniak et al. 2004). Besides, to improve classification and light elements, I analyzed all available observations of these stars from the Catalina Surveys (Drake et al. 2009) and SuperWASP (Butters et al. 2010). The sky area with RA between 07h 11m and 08h 45m, Dec between +40° and +52° was searched.
Many of the variables presented in this paper are close visual pairs that cannot be separated with the low resolution of the surveys like NSVS or 1SWASP. Data from the Catalina surveys, which have resolution as good as 12 arcseconds, provide a possibility to solve this problem. In these cases, combined brightness of several stars was measured in the NSVS and 1SWASP, so that the resulting amplitude is underestimated and the variable's mean brightness appears much higher than in reality; for this reason, only CV (Catalina) magnitudes are tabulated for such stars.
These observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The coordinates were drawn either from the Tycho-2 or from the 2MASS catalogs.
The SuperWASP observations are available as FITS tables, which were converted into ASCII tables using the OMC2ASCII program as described by Sokolovsky (2007).
Acknowledgements: Thanks are due to Dr. K.V. Sokolovsky for his advice concerning data retrieving. The author wishes to thank Dr. V.P. Goranskij for providing his software. This study was supported by the Russian Foundation for Basic Research (grant 13- 02-00664) and by the Program "Non-stationary Phenomena of Objects in the Universe" of the Presidium of Russian Academy of Sciences.References:
Butters, O.W., West, R.G., Anderson, D.R., et al., 2010, Astron. and Astrophys., 520, L10
Drake, A.J., Djorgovski, S.G., Mahabal, A., et al., 2009, Astrophys. J., 696, 870
Palaversa, L., Ivezić, Ž., Eyer, L., et al., 2013, Astron. J., 146, 101
Sergey, I., 2013, Perem. Zvezdy Prilozh., 13, No. 9
Sokolovsky, K.V., 2007, Perem. Zvezdy Prilozh., 7, No. 30
Woźniak, P.R., Vestrand, W.T., Akerlof, C.W., et al., 2004, Astron. J., 127, 2436