Comments:
1. MinII = 16m.61.
2. Primary minima:HJD(TT) | +/- |
2455024.3397 | 0.0004 |
2455034.413 | 0.003 |
2455126.2540 | 0.0005 |
2455132.229 | 0.001 |
MinII = 17m.84.
3. Primary minima:HJD(TT) | +/- |
2455015.4534 | 0.0004 |
2455014.327 | 0.001 |
2455129.2054 | 0.0006 |
MinII
= 15m.87.
4. Primary minima:HJD(TT) | +/- |
2455074.5136 | 0.0007 |
2455126.2224 | 0.0004 |
2455132.2282 | 0.0007 |
MinII
= 15m.75.
5. Primary minima:HJD(TT) | +/- |
2455025.3387 | 0.0006 |
2455073.3304 | 0.0004 |
2455074.2447 | 0.0004 |
2455086.416 | 0.001 |
2455128.2012 | 0.0005 |
MinII
= 15m.58.
6. Primary minima:HJD(TT) | +/- |
2455032.3751 | 0.0005 |
2455074.2505 | 0.0005 |
2455131.2217 | 0.0005 |
MinII
= 17m.29.
7. Primary minima:HJD(TT) | +/- |
2455015.4356 | 0.0009 |
2455071.3285 | 0.0008 |
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) | +/- |
2455032.3844 | 0.0007 |
2455038.2946 | 0.0007 |
2455071.3199 | 0.0002 |
2455074.2772 | 0.0007 |
2455131.2099 | 0.0005 |
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 |
2455072.5217 | 0.0009 |
2455073.3142 | 0.0006 |
Min
II = 18m.33.
13. Primary minima:HJD(TT) | +/- |
2455038.3843 | 0.0003 |
2455073.3508 | 0.0007 |
2455074.2798 | 0.0006 |
2455126.2658 | 0.0006 |
2455131.2156 | 0.0006 |
MinII
= 17m.28.
14. Primary minima:HJD(TT) | +/- |
2455038.3665 | 0.0009 |
2455129.1997 | 0.0008 |
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) | +/- |
2455015.4176 | 0.0008 |
2455073.2641 | 0.0007 |
2455086.4040 | 0.0007 |
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) | +/- |
2455072.2977 | 0.0005 |
2455073.3768 | 0.0004 |
2455129.2070 | 0.0004 |
2455132.2399 | 0.0009 |
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 |
2455086.3851 | 0.0010 |
2455125.2410 | 0.0006 |
Min
II = 17m.10. O'Connell effect.
26. Primary minima:HJD(TT) | +/- |
2455015.4239 | 0.0007 |
2455020.4137 | 0.0008 |
2455025.402 | 0.001 |
2455073.3429 | 0.0005 |
2455128.1979 | 0.0006 |
Min
II = 17m.89.
27. Primary minimum: HJD(TT) 2455074.365 +/- 0.001. MinII = 17m.16.
28. Primary minima:HJD(TT) | +/- |
2455012.4636 | 0.0004 |
2455024.3963 | 0.0008 |
2455038.3099 | 0.0003 |
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) | +/- |
2455024.3947 | 0.0003 |
2455025.3700 | 0.0001 |
MinII
= 13m.75.
31. Primary minima:HJD(TT) | +/- |
2455024.366 | 0.001 |
2455025.3348 | 0.0008 |
2455032.4164 | 0.0010 |
2455071.353 | 0.001 |
2455072.3162 | 0.0007 |
2455073.2865 | 0.0007 |
2455074.247 | 0.001 |
2455086.4675 | 0.0007 |
2455132.1671 | 0.0009 |
Min
II = 17m.79.
32. MinII = 16m.64.
33. Primary minima:HJD(TT) | +/- |
2455032.3408 | 0.0004 |
2455032.3408 | 0.0003 |
2455074.3848 | 0.0007 |
2455129.2391 | 0.0006 |
2455131.2078 | 0.0006 |
2455132.1951 | 0.0005 |
MinII
= 16m.43.
34. Primary minimum: HJD(TT) 2455014.3042 +/- 0.0008. MinII = 17m.87.
35. Primary minima:HJD(TT) | +/- |
2455021.3577 | 0.0009 |
2455025.3854 | 0.0003 |
MinII
= 15m.10.
36. Three maxima:HJD(TT) | +/- |
2455072.5414 | 0.0002 |
2455086.4990 | 0.0007 |
2455126.2146 | 0.0009 |
37. Primary minimum: HJD(TT) 2455020.4176 +/- 0.0007. MinII = 15m.07.
38. Primary minima:HJD(TT) | +/- |
2455024.4281 | 0.0005 |
2455025.3524 | 0.0004 |
2455038.3350 | 0.0004 |
MinII
= 15m.62.
39. Primary minima:HJD(TT) | +/- |
2455024.3222 | 0.0004 |
2455032.3119 | 0.0003 |
2455038.3063 | 0.0005 |
2455072.2661 | 0.0005 |
2455074.2637 | 0.0002 |
2455100.2326 | 0.0006 |
2455128.1980 | 0.0005 |
2455132.1937 | 0.0009 |
MinII
= 16m.86.
40. Primary minimum: HJD(TT) 2455073.2543 +/- 0.0007. MinII = 15m.71.
41. MinII = 16m.93.
42. Primary minima:HJD(TT) | +/- |
2455024.3417 | 0.0003 |
2455024.3398 | 0.0007 |
2455072.2802 | 0.0002 |
2455074.5273 | 0.0004 |
2455086.5090 | 0.0006 |
2455129.2046 | 0.0002 |
2455132.2024 | 0.0006 |
MinII
= 15m.92.
43. Primary minima:HJD(TT) | +/- |
2455021.3582 | 0.0005 |
2455025.3504 | 0.0004 |
2455073.2906 | 0.0002 |
2455086.4149 | 0.0001 |
2455125.2215 | 0.0003 |
2455129.2157 | 0.0003 |
MinII
= 15m.18.
44. Primary minima:HJD(TT) | +/- |
2455021.378 | 0.001 |
2455025.3616 | 0.0007 |
2455038.399 | 0.001 |
2455073.5375 | 0.0007 |
2455074.2637 | 0.0003 |
2455076.436 | 0.001 |
2455132.2233 | 0.0004 |
MinII
= 15m.90.
45. Primary minima:HJD(TT) | +/- |
2455025.374 | 0.001 |
2455074.3697 | 0.0004 |
2455086.4310 | 0.0005 |
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) | +/- |
2455073.2701 | 0.0004 |
2455100.2073 | 0.0008 |
MinII
= 15m.30.
49. Primary minima:HJD(TT) | +/- |
2455015.4317 | 0.0004 |
2455071.3406 | 0.0004 |
2455072.3093 | 0.0006 |
2455073.2708 | 0.0004 |
2455100.2586 | 0.0005 |
2455128.2162 | 0.0003 |
2455129.1805 | 0.0004 |
MinII
= 16m.26. O'Connell effect.
50. MinII = 15m.21.
51. Primary minima:HJD(TT) | +/- |
2455072.5178 | 0.0009 |
2455073.3495 | 0.0009 |
2455074.4555 | 0.0006 |
2455129.188 | 0.001 |
2455132.2273 | 0.0007 |
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