Comments:
1. MinII=15m.92.
2. Primary minima:HJD(TT) | ± |
2454964.370 | 0.001 |
2454972.384 | 0.001 |
2454984.4113 | 0.0006 |
2454988.413 | 0.002 |
MinII=17m.47.
3. Primary minima:HJD(TT) | ± |
2454967.4169 | 0.0004 |
2454979.4000 | 0.0008 |
2454984.340 | 0.001 |
MinII=18m.16.
4. O'Connell effect. Primary minima:HJD(TT) | ± |
2454958.4497 | 0.0003 |
2454964.3814 | 0.0003 |
2454976.4942 | 0.0008 |
2454979.4567 | 0.0005 |
2454981.43550 | 0.00007 |
2454984.3998 | 0.0003 |
2454988.3545 | 0.0001 |
2454990.3314 | 0.0005 |
2454992.3093 | 0.0002 |
MinII=14m.76.
5. Primary minima:HJD(TT) | ± |
2454964.400 | 0.001 |
2454972.459 | 0.001 |
2454973.4245 | 0.0009 |
2454981.490 | 0.001 |
2454984.394 | 0.001 |
2454991.4866 | 0.0007 |
2454992.454 | 0.001 |
MinII=18m.23.
6. Primary minima:HJD(TT) | ± |
2454990.3567 | 0.0006 |
2454991.4944 | 0.0007 |
MinII=15m.43.
7. Primary minima:HJD(TT) | ± |
2454958.4555 | 0.0007 |
2454967.3838 | 0.0004 |
2454972.383 | 0.001 |
2454973.4536 | 0.0008 |
2454988.4590 | 0.0005 |
MinII=17m.57.
8. Infrared colors J-H=0.611, H-K=0.194, J-K=0.805 (2MASS) are consistent with
the
K spectral type (Bessell and Brett 1988) and BY: classification.
10. Primary minima:HJD(TT) | ± |
2454989.4734 | 0.0004 |
2454990.3703 | 0.0006 |
MinII=14m.83.
11. Primary minima:HJD(TT) | ± |
2454967.382 | 0.001 |
2454984.471 | 0.001 |
2454990.398 | 0.002 |
2454991.439 | 0.001 |
MinII=15m.92.
12. Primary minima:HJD(TT) | ± |
2454972.489 | 0.002 |
2454988.414 | 0.003 |
13. Blazhko effect. Maxima:HJD(TT) | ± |
2454964.3685 | 0.0008 |
2454972.4674 | 0.0009 |
2454979.4078 | 0.0005 |
2454990.4049 | 0.0009 |
14. Primary minimum: HJD(TT) 2454993.3769 ± 0.0006. MinII=13m.00.
15. Primary minimum: HJD(TT) 2454991.3888 ± 0.0008. MinII=15m.16.
16. Primary minima:HJD(TT) | ± |
2454964.4462 | 0.0007 |
2454989.4656 | 0.0008 |
MinII=14m.67.
17. Primary minima:HJD(TT) | ± |
2454964.457 | 0.001 |
2454984.353 | 0.002 |
MinII=15m.56.
18. Primary minima:HJD(TT) | ± |
2454967.4086 | 0.0007 |
2454990.428 | 0.001 |
MinII=17m.88.
19. Primary minima:HJD(TT) | ± |
2454964.4629 | 0.0007 |
2454972.378 | 0.002 |
2454990.4759 | 0.0008 |
MinII=17m.27.
20. A close pair of two stars with equal brightness: 2MASS 21124687+4105119 and
2MASS 21124659+4105135. The angular resolution of our telescope is insufficient to
determine
which of the two stars varies. Twice longer period 3d.05 is also possible.
Primary minima:HJD(TT) | ± |
2454964.4278 | 0.0009 |
2454967.4702 | 0.0006 |
21. Primary minimum: HJD(TT) 2454990.453 ± 0.001.
22. Primary minimum: HJD(TT) 2454993.397 ± 0.001. MinII=15m.82.
24. Period 1d.656 is also possible. Primary minimum: HJD(TT) 2454990.4019
± 0.0005.
25. MinII=17m.13.
26. MinII=15m.99.
27. Primary minima:HJD(TT) | ± |
2454973.399 | 0.002 |
2454993.3885 | 0.0005 |
MinII=17m.36.
28. Primary minima:HJD(TT) | ± |
2454967.4453 | 0.0006 |
2454975.4350 | 0.0005 |
2454976.4795 | 0.0009 |
2454984.4607 | 0.0006 |
2454990.3665 | 0.0005 |
2454991.4084 | 0.0006 |
2454992.4475 | 0.0007 |
MinII=17m.04.
29. MinII=15m.57.
30. Primary minimum: HJD(TT) 2454964.4438 ± 0.0009. MinII=15m.93.
31. Primary minima:HJD(TT) | ± |
2454967.3700 | 0.0007 |
2454979.3999 | 0.0008 |
2454988.416 | 0.002 |
2454991.4224 | 0.0005 |
MinII=17m.72.
32. Primary minima:HJD(TT) | ± |
2454964.4346 | 0.0005 |
2454967.4420 | 0.0007 |
2454973.4634 | 0.0009 |
2454979.4809 | 0.0006 |
2454982.4870 | 0.0008 |
2454993.3246 | 0.0007 |
MinII=16m.55.
33. Primary minima:HJD(TT) | ± |
2454958.4497 | 0.0010 |
2454973.4628 | 0.0008 |
2454979.465 | 0.001 |
2454984.344 | 0.001 |
2454990.3446 | 0.0009 |
2454991.471 | 0.002 |
2454993.350 | 0.002 |
MinII=17m.82.
34. Primary minima:HJD(TT) | ± |
2454964.4699 | 0.0005 |
2454972.3928 | 0.0002 |
2454985.4612 | 0.0002 |
2454991.4005 | 0.0003 |
2454993.3800 | 0.0005 |
MinII=15m.00.
35. Primary minima:HJD(TT) | ± |
2454964.3993 | 0.0005 |
2454982.4812 | 0.0009 |
2454985.3212 | 0.0008 |
MinII=16m.76.
36. Primary minima:HJD(TT) | ± |
2454989.4038 | 0.0004 |
2454992.4555 | 0.0004 |
2454993.3656 | 0.0004 |
MinII=14m.31.
37. Primary minima:HJD(TT) | ± |
2454973.4957 | 0.0006 |
2454990.4162 | 0.0004 |
MinII=15m.06.
38. Primary minimum: HJD(TT) 2454990.3547 ± 0.0005. MinII=15m.61.
39. Primary minimum: HJD(TT) 2454964.371 ± 0.002. MinII=15m.05.
40. Primary minimum: HJD(TT) 2454958.492 ± 0.001. MinII=15m.61.
41. A close pair of two stars: USNO-A2.0 1275-15145028 and USNO-A2.0 1275-15145165.
The brighter star USNO-A2.0 1275-15145028 varies. MinII=17m.80.
42. A close pair of two stars, not found in any catalogues separately. The bright
component varies.
43. Primary minima:HJD(TT) | ± |
2454964.4507 | 0.0004 |
2454973.404 | 0.002 |
2454975.4407 | 0.0009 |
2454984.3976 | 0.0004 |
2454993.3489 | 0.0008 |
MinII=15m.90.
44. Primary minima:HJD(TT) | ± |
2454988.3953 | 0.0007 |
2454990.347 | 0.002 |
MinII=16m.94.
45. Primary minimum: HJD(TT) 2454985.314 ± 0.002. MinII=17m.84.
46. Primary minima:HJD(TT) | ± |
2454972.4014 | 0.0006 |
2454981.4632 | 0.0009 |
2454988.4054 | 0.0003 |
2454991.4249 | 0.0004 |
MinII=14m.49.
47. Primary minimum: HJD(TT) 2454990.427 ± 0.002. MinII=18m.03.
Remarks:
During observations of a field in Cygnus, we discovered 47 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 649 images with 5-minute exposures were obtained on JD 2454958 - 2454993.
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 1275-15116791 = USNO-B1.0 1305-0426749
(
α=21h15m00s.61, δ=+40°34′ 10″.3,
J2000, 2MASS), R1=13m.25, R2=13m.84
(USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming
Rcomp=13m.545.
The coordinates of the variable stars in the table were drawn from the 2MASS catalogue
(Skrutskie et al. 2006) except for a few double stars or 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).
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