Peremennye Zvezdy

Article in PDF
"Peremennye Zvezdy",
Prilozhenie,
vol. 10, N 2 (2010)

New Variable Stars in Cygnus

T. Kryachko#1, A. Samokhvalov#2, B. Satovskiy#1, D. Denisenko#3
#1. Astrotel Observatory, Karachay-Cherkessia, Russia;
#2. Surgut, Russia;
#3. Space Research Institute (IKI), Russian Academy of Sciences, Moscow, Russia

ISSN 2221–0474

Received:   17.01.2010;   accepted:   27.01.2010
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru, denis@hea.iki.rssi.ru)

#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 USNO-A2.0 1200-1674843021 00 10.14, +33 59 43.3EW16.2016.67 0.4072455014.5297Min Comm. 101_PC-R.png01_chart.jpg01_data.txt
2 USNO-A2.0 1200-1675638521 00 18.57, +34 21 38.2EW17.3017.84 0.314532455126.2540Min Comm. 202_PC-R.png02_chart.jpg02_data.txt
3 USNO-A2.0 1200-1676227221 00 24.82, +34 09 42.8EW15.7415.88 0.376692455015.4534Min Comm. 303_PC-R.png03_chart.jpg03_data.txt
4 USNO-A2.0 1200-1677062221 00 33.71, +33 30 08.4EW15.3415.80 0.26122455126.2224Min Comm. 404_PC-R.png04_chart.jpg04_data.txt
5 USNO-A2.0 1200-1677601721 00 39.46, +33 33 30.9EW15.4215.61 0.229612455074.2447Min Comm. 505_PC-R.png05_chart.jpg05_data.txt
6 USNO-A2.0 1200-1677666521 00 40.18, +34 01 02.4EW16.6717.29 0.377272455131.2217Min Comm. 606_PC-R.png06_chart.jpg06_data.txt
7 USNO-A2.0 1200-1677680021 00 40.36, +33 56 49.3EW17.6217.92 0.465862455071.3285Min Comm. 707_PC-R.png07_chart.jpg07_data.txt
8 USNO-A2.0 1200-1677763521 00 41.26, +34 17 39.5BY:15.5415.64 10.82455024.87Max Comm. 808_PC-R.png08_chart.jpg08_data.txt
9 USNO-A2.0 1200-1677837121 00 42.05, +33 47 09.2EW17.9418.71 0.268542455071.3199Min Comm. 909_PC-R.png09_chart.jpg09_data.txt
10 USNO-A2.0 1200-1678185121 00 45.88, +33 38 01.5EB17.4517.81 0.392372455073.3822Min Comm. 1010_PC-R.png10_chart.jpg10_data.txt
11 USNO-A2.0 1200-1678473521 00 48.95, +33 31 36.5EA17.7618.85 0.76462455129.248Min Comm. 1111_PC-R.png11_chart.jpg11_data.txt
12 USNO-A2.0 1200-1678557121 00 49.87, +34 01 33.9EW17.8318.42 0.398542455073.3142Min Comm. 1212_PC-R.png12_chart.jpg12_data.txt
13 USNO-A2.0 1200-1678990421 00 54.39, +34 11 18.9EW16.9117.33 0.309442455038.3843Min Comm. 1313_PC-R.png13_chart.jpg13_data.txt
14 USNO-A2.0 1200-1679226721 00 56.92, +34 11 13.4EW17.7418.10 0.345372455129.1997Min Comm. 1414_PC-R.png14_chart.jpg14_data.txt
15 USNO-A2.0 1200-1679526421 01 00.17, +34 15 57.8DCEP:15.6616.12 8.12455018.4Max Comm. 1515_PC-R.png15_chart.jpg15_data.txt
16 USNO-A2.0 1200-1680135221 01 06.75, +34 23 57.3EA15.2915.93 0.69162455038.3487Min Comm. 1616_PC-R.png16_chart.jpg16_data.txt
17 USNO-A2.0 1200-1680667121 01 12.62, +33 42 03.3EB17.6718.71 0.438232455073.2641Min Comm. 1717_PC-R.png17_chart.jpg17_data.txt
18 USNO-A2.0 1200-1681307121 01 19.66, +33 54 11.8BY:15.9216.08 0.428512455014.4640Max Comm. 1818_PC-R.png18_chart.jpg18_data.txt
19 USNO-A2.0 1200-1681331621 01 19.96, +33 38 28.4EW13.8013.83 0.215682455132.2399Min Comm. 1919_PC-R.png19_chart.jpg19_data.txt
20 USNO-A2.0 1200-1682052021 01 27.93, +33 39 48.9EW15.2415.65 0.37832455014.4698Min Comm. 2020_PC-R.png20_chart.jpg20_data.txt
21 USNO-A2.0 1200-1682082221 01 28.20, +33 53 54.2EA17.4318.35 1.477:2455025.3309Min Comm. 2121_PC-R.png21_chart.jpg21_data.txt
22 USNO-A2.0 1200-1682571721 01 33.51, +34 20 34.2EA16.5716.78 1.15062455074.3629Min Comm. 2222_PC-R.png22_chart.jpg22_data.txt
23 USNO-A2.0 1200-1682832721 01 36.39, +34 22 33.4EA16.7017.16 0.78572455024.3403Min Comm. 2323_PC-R.png23_chart.jpg23_data.txt
24 USNO-A2.0 1200-1683269821 01 40.99, +33 32 23.8GDOR14.6214.69 0.62562455071.2996Max Comm. 2424_PC-R.png24_chart.jpg24_data.txt
25 USNO-A2.0 1200-1683290121 01 41.23, +33 49 41.5EW16.5417.20 0.404732455125.2410Min Comm. 2525_PC-R.png25_chart.jpg25_data.txt
26 USNO-A2.0 1200-1683365021 01 42.09, +34 11 42.2EW17.3117.94 0.383582455073.3429Min Comm. 2626_PC-R.png26_chart.jpg26_data.txt
27 USNO-A2.0 1200-1683393221 01 42.33, +34 12 35.8EW16.9017.16 0.480642455074.365Min Comm. 2727_PC-R.png27_chart.jpg27_data.txt
28 USNO-A2.0 1200-1684218721 01 51.30, +34 00 02.7EA13.9514.39 1.98792455038.3099Min Comm. 2828_PC-R.png28_chart.jpg28_data.txt
29 USNO-A2.0 1200-1684363721 01 52.90, +34 25 01.7EW12.9913.45 0.31552455021.3798Min Comm. 2929_PC-R.png29_chart.jpg29_data.txt
30 USNO-A2.0 1200-1684744121 01 57.16, +34 00 32.0EW13.5113.76 0.487122455025.3700Min Comm. 3030_PC-R.png30_chart.jpg30_data.txt
31 USNO-A2.0 1200-1684883921 01 58.75, +34 07 41.2EW17.4317.96 0.321772455032.4164Min Comm. 3131_PC-R.png31_chart.jpg31_data.txt
32 USNO-A2.0 1200-1685005021 02 00.05, +34 01 13.5EA16.5717.08 1.41172455013.3701Min Comm. 3232_PC-R.png32_chart.jpg32_data.txt
33 USNO-A2.0 1200-1685387121 02 04.23, +34 01 29.9EW16.1316.47 0.328462455032.3408Min Comm. 3333_PC-R.png33_chart.jpg33_data.txt
34 USNO-A2.0 1200-1685868621 02 09.50, +34 12 24.9EW17.3517.99 0.33052455014.3042Min Comm. 3434_PC-R.png34_chart.jpg34_data.txt
35 USNO-A2.0 1200-1686063321 02 11.63, +34 00 07.0EA14.7115.16 2.01312455025.3854Min Comm. 3535_PC-R.png35_chart.jpg35_data.txt
36 USNO-A2.0 1200-1686496321 02 16.35, +34 12 21.2RRAB16.4017.50 0.536812455072.5414Max Comm. 3636_PC-R.png36_chart.jpg36_data.txt
37 USNO-A2.0 1200-1686820421 02 19.87, +33 42 05.5EW14.8515.13 0.40022455020.4176Min Comm. 3737_PC-R.png37_chart.jpg37_data.txt
38 USNO-A2.0 1200-1686912821 02 20.85, +34 16 59.8EW15.0215.72 0.30902455038.3350Min Comm. 3838_PC-R.png38_chart.jpg38_data.txt
39 USNO-A2.0 1200-1687769721 02 30.36, +33 46 12.7EW16.4516.91 0.285382455074.2637Min Comm. 3939_PC-R.png39_chart.jpg39_data.txt
40 USNO-A2.0 1200-1688601721 02 39.50, +34 19 31.7EW15.4115.76 0.450702455073.2543Min Comm. 4040_PC-R.png40_chart.jpg40_data.txt
41 USNO-A2.0 1200-1689118921 02 45.30, +33 43 09.3EW16.4816.97 0.34542455014.6026Min Comm. 4141_PC-R.png41_chart.jpg41_data.txt
42 USNO-A2.0 1200-1690181721 02 57.27, +33 41 58.8EW15.3215.94 0.374502455129.2046Min Comm. 4242_PC-R.png42_chart.jpg42_data.txt
43 USNO-A2.0 1200-1690465521 03 00.37, +33 51 39.7EB14.9315.62 0.570692455086.4149Min Comm. 4343_PC-R.png43_chart.jpg43_data.txt
44 USNO-A2.0 1200-1690497321 03 00.78, +33 55 43.2EW15.5715.97 0.362242455074.2637Min Comm. 4444_PC-R.png44_chart.jpg44_data.txt
45 USNO-A2.0 1200-1690632721 03 02.30, +34 10 20.5EW16.4916.90 0.376862455074.3697Min Comm. 4545_PC-R.png45_chart.jpg45_data.txt
46 USNO-A2.0 1200-1691785121 03 15.22, +34 16 34.5EW14.6014.74 0.491792455086.9120Min Comm. 4646_PC-R.png46_chart.jpg46_data.txt
47 USNO-A2.0 1200-1692300621 03 21.01, +33 43 14.0EA15.9116.07 2.8172455086.4094Min Comm. 4747_PC-R.png47_chart.jpg47_data.txt
48 USNO-A2.0 1200-1692402221 03 22.07, +33 47 27.9EB15.1315.38 0.44172455073.2701Min Comm. 4848_PC-R.png48_chart.jpg48_data.txt
49 USNO-A2.0 1200-1693045021 03 29.41, +34 14 23.3EB16.0416.49 0.482002455128.2162Min Comm. 4949_PC-R.png49_chart.jpg49_data.txt
50 USNO-A2.0 1200-1694230321 03 42.53, +33 53 25.2EA15.0915.35 4.8442455018.9164Min Comm. 5050_PC-R.png50_chart.jpg50_data.txt
51 USNO-A2.0 1200-1694581921 03 46.45, +33 59 47.3EW16.2716.49 0.276422455072.5178Min Comm. 5151_PC-R.png51_chart.jpg51_data.txt
52 USNO-A2.0 1200-1695637421 03 58.07, +33 47 43.7BY:14.0414.10 4.72455072.2Max Comm. 5252_PC-R.png52_chart.jpg52_data.txt
53 USNO-A2.0 1200-1696153021 04 03.89, +33 33 06.8EW14.6814.94 0.45222455074.4680Min Comm. 5353_PC-R.png53_chart.jpg53_data.txt
54 USNO-A2.0 1200-1697832421 04 22.81, +33 32 21.1EA14.5014.64 1.792455086.4021Min Comm. 5454_PC-R.png54_chart.jpg54_data.txt
55 USNO-A2.0 1200-1698421621 04 29.29, +34 13 43.8EW15.4215.56 0.35482455129.2235Min Comm. 5555_PC-R.png55_chart.jpg55_data.txt

Comments:


1. MinII = 16m.61.

2. Primary minima:
HJD(TT)+/-
2455024.33970.0004
2455034.413 0.003
2455126.25400.0005
2455132.229 0.001
MinII = 17m.84.

3. Primary minima:
HJD(TT)+/-
2455015.45340.0004
2455014.327 0.001
2455129.20540.0006
MinII = 15m.87.

4. Primary minima:
HJD(TT)+/-
2455074.51360.0007
2455126.22240.0004
2455132.22820.0007
MinII = 15m.75.

5. Primary minima:
HJD(TT)+/-
2455025.33870.0006
2455073.33040.0004
2455074.24470.0004
2455086.416 0.001
2455128.20120.0005
MinII = 15m.58.

6. Primary minima:
HJD(TT)+/-
2455032.37510.0005
2455074.25050.0005
2455131.22170.0005
MinII = 17m.29.

7. Primary minima:
HJD(TT)+/-
2455015.43560.0009
2455071.32850.0008
MinII = 17m.92.

8. Infrared colors J-H = 0.774, H-K = 0.105, J-K = 0.879 (2MASS) are consistent with the gK spectral type (Bessell and Brett 1988) and BY: classification.

9. Primary minima:
HJD(TT)+/-
2455032.38440.0007
2455038.29460.0007
2455071.31990.0002
2455074.27720.0007
2455131.20990.0005
MinII = 18m.61.

10. A very close pair of two faint stars, not found in any catalogues separately. The angular resolution of our telescope is insufficient to determine which of the two stars varies. Primary minimum: HJD(TT) 2455073.3822 +/- 0.0007. MinII = 17m.63.

11. Primary minimum: HJD(TT) 2455129.248 +/- 0.001. MinII = 18m.16.

12. Primary minima:
HJD(TT)+/-
2455071.325 0.001
2455072.52170.0009
2455073.31420.0006
Min II = 18m.33.

13. Primary minima:
HJD(TT)+/-
2455038.38430.0003
2455073.35080.0007
2455074.27980.0006
2455126.26580.0006
2455131.21560.0006
MinII = 17m.28.

14. Primary minima:
HJD(TT)+/-
2455038.36650.0009
2455129.19970.0008
MinII = 18m.08.

15. Infrared colors J-H = 0.700, H-K = 0.172, J-K = 0.872 (2MASS) are consistent with the gK spectral type (Bessell and Brett 1988) and DCEP: classification.

16. Primary minimum: HJD(TT) 2455038.3487 +/- 0.0003. MinII = 15m.88.

17. Primary minima:
HJD(TT)+/-
2455015.41760.0008
2455073.26410.0007
2455086.40400.0007
MinII = 18m.13.

18. Infrared colors J-H = 0.552, H-K = 0.119, J-K = 0.671 (2MASS) are consistent with the dK spectral type (Bessell and Brett 1988) and BY: classification.

19. Primary minima:
HJD(TT)+/-
2455072.29770.0005
2455073.37680.0004
2455129.20700.0004
2455132.23990.0009
MinII = 13m.825.

20. MinII = 15m.60.

21. Primary minimum: HJD(TT) 2455025.3309 +/- 0.0004.

22. Primary minimum: HJD(TT) 2455074.3629 +/- 0.0004. MinII = 16m.75.

23. Primary minimum: HJD(TT) 2455024.3403 +/- 0.0009.

24. Infrared colors J-H = 0.343, H-K = -0.081, J-K = 0.262 (2MASS) are consistent with F spectral type and GDOR classification.

25. A close pair of two stars: USNO-B1.0 1238-0477142 and USNO-B1.0 1238-0477136. We observed bright component USNO-B1.0 1238-0477142 = USNO-A2.0 1200-16832901. Primary minima:
HJD(TT)+/-
2455020.414 0.001
2455086.38510.0010
2455125.24100.0006
Min II = 17m.10. O'Connell effect.

26. Primary minima:
HJD(TT)+/-
2455015.42390.0007
2455020.41370.0008
2455025.402 0.001
2455073.34290.0005
2455128.19790.0006
Min II = 17m.89.

27. Primary minimum: HJD(TT) 2455074.365 +/- 0.001. MinII = 17m.16.

28. Primary minima:
HJD(TT)+/-
2455012.46360.0004
2455024.39630.0008
2455038.30990.0003
MinII = 14m.02. O'Connell effect.

29. GSC 2709-01850. Primary minimum: HJD(TT) 2455021.3798 +/- 0.0002. MinII = 13m.39.

30. Primary minima:
HJD(TT)+/-
2455024.39470.0003
2455025.37000.0001
MinII = 13m.75.

31. Primary minima:
HJD(TT)+/-
2455024.366 0.001
2455025.33480.0008
2455032.41640.0010
2455071.353 0.001
2455072.31620.0007
2455073.28650.0007
2455074.247 0.001
2455086.46750.0007
2455132.16710.0009
Min II = 17m.79.

32. MinII = 16m.64.

33. Primary minima:
HJD(TT)+/-
2455032.34080.0004
2455032.34080.0003
2455074.38480.0007
2455129.23910.0006
2455131.20780.0006
2455132.19510.0005
MinII = 16m.43.

34. Primary minimum: HJD(TT) 2455014.3042 +/- 0.0008. MinII = 17m.87.

35. Primary minima:
HJD(TT)+/-
2455021.35770.0009
2455025.38540.0003
MinII = 15m.10.

36. Three maxima:
HJD(TT)+/-
2455072.54140.0002
2455086.49900.0007
2455126.21460.0009


37. Primary minimum: HJD(TT) 2455020.4176 +/- 0.0007. MinII = 15m.07.

38. Primary minima:
HJD(TT)+/-
2455024.42810.0005
2455025.35240.0004
2455038.33500.0004
MinII = 15m.62.

39. Primary minima:
HJD(TT)+/-
2455024.32220.0004
2455032.31190.0003
2455038.30630.0005
2455072.26610.0005
2455074.26370.0002
2455100.23260.0006
2455128.19800.0005
2455132.19370.0009
MinII = 16m.86.

40. Primary minimum: HJD(TT) 2455073.2543 +/- 0.0007. MinII = 15m.71.

41. MinII = 16m.93.

42. Primary minima:
HJD(TT)+/-
2455024.34170.0003
2455024.33980.0007
2455072.28020.0002
2455074.52730.0004
2455086.50900.0006
2455129.20460.0002
2455132.20240.0006
MinII = 15m.92.

43. Primary minima:
HJD(TT)+/-
2455021.35820.0005
2455025.35040.0004
2455073.29060.0002
2455086.41490.0001
2455125.22150.0003
2455129.21570.0003
MinII = 15m.18.

44. Primary minima:
HJD(TT)+/-
2455021.378 0.001
2455025.36160.0007
2455038.399 0.001
2455073.53750.0007
2455074.26370.0003
2455076.436 0.001
2455132.22330.0004
MinII = 15m.90.

45. Primary minima:
HJD(TT)+/-
2455025.374 0.001
2455074.36970.0004
2455086.43100.0005
Min II = 16m.85.

46. MinII = 14m.72.

47. A close pair of two faint stars, not found in any catalogues separately. The brighter component varies. Period 1.d4088 is also possible. Primary minimum: HJD(TT) 2455086.4094 +/- 0.0009.

48. A close pair of two stars with equal brightness, not found in any catalogues separately. The angular resolution of our telescope is insufficient to determine which of the two stars varies. Primary minima:
HJD(TT)+/-
2455073.27010.0004
2455100.20730.0008
MinII = 15m.30.

49. Primary minima:
HJD(TT)+/-
2455015.43170.0004
2455071.34060.0004
2455072.30930.0006
2455073.27080.0004
2455100.25860.0005
2455128.21620.0003
2455129.18050.0004
MinII = 16m.26. O'Connell effect.

50. MinII = 15m.21.

51. Primary minima:
HJD(TT)+/-
2455072.51780.0009
2455073.34950.0009
2455074.45550.0006
2455129.188 0.001
2455132.22730.0007
MinII = 16m.43. O'Connell effect.

52. Infrared colors J-H = 0.372, H-K = 0.079, J-K = 0.451 (2MASS) are consistent with the dG spectral type (Bessell and Brett 1988) and BY: classification.

53. Primary minimum: HJD(TT) 2455074.4680 +/- 0.0009. MinII = 14m.94.

54. Primary minimum: HJD(TT) 2455086.4021 +/- 0.0009.

55. Primary minimum: HJD(TT) 2455129.2235 +/- 0.0007. MinII = 15m.54.

Remarks:
During observations of a field in Cygnus, we discovered 55 new variable stars. Our observations were carried out at the Astrotel-Caucasus observatory using the 300-mm Ritchey-Chretien telescope, equipped with an unfiltered Apogee Alta U9000 CCD camera. A total of 790 images with 5-minute exposures were obtained on JD 2455012 - 2455132. For basic reductions for dark current, flat fields, and bias, we used IRAF routines. For search and photometry of new variable stars we applied VaST software by Sokolovsky and Lebedev (2005). The comparison star was USNO-A2.0 1200-16826852 = USNO-B1.0 1238-0476997 (RA=21:01:34.73, Dec=+33:49:47.9, J2000, 2MASS), R1 = 13.m67, R2 = 13.m66 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp = 13.m665. The coordinates of the variable stars in the table were drawn from the 2MASS catalogue (Skrutskie et al. 2006) except for a few stars missing in the 2MASS catalogue, their coordinates were drawn from the USNO-A2.0 catalogue (Monet et al. 1998). For search for periods and epochs of extrema, we use Peranso software (www.peranso.com).

Acknowledgements: We would like to thank S. V. Antipin and N. N. Samus for helpful discussion.

References:
Bessell, M.S., Brett, J.M., 1988, PASP, 100, 1134
Monet, D., Bird, A., Canzian, B., et al., 1998, USNO-A2.0, A Catalog of Astrometric Standards (U.S. Naval Observatory, Washington, DC), Centre de Donnees Astronomiques de Strasbourg, I/252
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, AJ, 131, 1163
Sokolovsky, K., Lebedev, A., 2005, in 12th Young Scientists' Conference on Astronomy and Space Physics, Kyiv, Ukraine, April 19-23, 2005, eds.: Simon, A.; Golovin, A., p.79


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