Comments:
2. A close pair of two stars: 2MASS 19523437+2057335 and
2MASS 19523464+2057340. The angular resulution of our telescope
is insufissient to determine which of the two stars varies.
MinII=14m.22.
3. Maxima:HJD(TT) | ± |
2454727.295 | 0.002 |
2454780.225 | 0.001 |
2454781.198 | 0.001 |
2455504.1465 | 0.0007 |
2455504.247 | 0.001 |
2455507.2663 | 0.0009 |
2455511.252 | 0.001 |
2455512.2276 | 0.0007 |
2455515.2464 | 0.0009 |
2455516.2135 | 0.0003 |
2455518.264 | 0.002 |
4. MinII=15m.44.
5. Primary minima:HJD(TT) | ± |
2454727.2910 | 0.0005 |
2455504.2034 | 0.0006 |
MinII=16m.04.
6. Primary minima:HJD(TT) | ± |
2454781.2111 | 0.0008 |
2455515.2105 | 0.0008 |
MinII=15m.28.
7. A close pair of two stars: 2MASS 19531118+2106222 and CMC14 195310.9+210618.
2MASS 19531118+2106222 varies. Infrared source IRAS 19510+2058. Primary minima:HJD(TT) | ± |
2454727.2833 | 0.0005 |
2454781.2087 | 0.0007 |
2455516.2338 | 0.0010 |
MinII=15m.58.
8. Period 0d.685447 and type EW are also possible.
9. Primary minima:HJD(TT) | ± |
2454725.3141 | 0.0008 |
2454726.367 | 0.003 |
2454745.326 | 0.001 |
2455513.235 | 0.001 |
2455518.240 | 0.002 |
MinII=14m.95.
10. Primary minima:HJD(TT) | ± |
2455516.1803 | 0.0009 |
2455518.2440 | 0.0006 |
MinII=13m.79.
12. Period 0d.471026 is also possible. Primary minimum: HJD(TT) 2454726.3707
± 0.0008. MinII=14m.32.
13. MinII=14m.65.
14. Primary minimum: HJD(TT) 2454727.2950 ± 0.0007.
15. A close pair of two stars: USNO-A2.0 1050-15548930 and 2MASS 19542631+2034125.
USNO-A2.0 1050-15548930 varies. MinII=15m.42.
16. Period 0d.267441 is also possible. MinII=17m.17.
17. Infrared colors J–H=0.984, H–K=0.307 and J–K=1.291 (2MASS)
are consistent
with M spectral type (Bessell and Brett 1988) and SR: classification.
18. Primary minimum: HJD(TT) 2455516.2329 ± 0.0007. MinII=15m.94.
19. Period 0d.269786 is also possible. MinII=16m.45.
20. Primary minimum: HJD(TT) 2455516.1861 ± 0.0008. MinII=16m.86.
21. Infrared colors J–H=1.035, H–K=0.384 and J–K=1.419 (2MASS)
are consistent with M
spectral type (Bessell and Brett 1988) and SR: classification.
22. Period 0d.3098 is also possible. MinII=16m.62.
23. A close pair of two stars: 2MASS 19544900+2025324 and 2MASS 19544893+2025359.
The angular resulution of our telescope
is insufissient to determine which of the two stars varies. Primary minima:HJD(TT) | ± |
2454781.2294 | 0.0004 |
2455509.2522 | 0.0008 |
MinII=13m.78.
24. Periods 0d.418246 or 0d.294669 are possible. MinII=17m.27.
25. A close pair of two stars: USNO-A2.0 1050-15589037 and a faint star, not found
in any catalogues. USNO-A2.0 1050-15589037 varies. Primary minimum: HJD(TT) 2455515.2541
± 0.0007. MinII=14m.02:.
26. Maxima:HJD(TT) | ± |
2454726.337 | 0.003 |
2454727.307 | 0.002 |
2454745.329 | 0.001 |
2454779.220 | 0.001 |
27. Period 0d.274336 is possible. MinII=16m.86:.
28. A close pair of two stars: USNO-A2.0 1050-15645954 and a faint star, not found
in any catalogues. USNO-A2.0 1050-15645954 varies. Period 1d.60142
is possible.
Primary minima:HJD(TT) | ± |
2454727.3230 | 0.0008 |
2455515.220 | 0.002 |
MinII=16m.46.
29. The shape of the light curve for observations intervals JD 2454725–2454788
and JD 2455504–2455518
is different: we found change of the depth of primary and secondary minima. Primary
minima:HJD(TT) | ± |
2454725.3537 | 0.0006 |
2454727.3733 | 0.0004 |
2455504.2063 | 0.0002 |
2455512.2841 | 0.0002 |
MinII=13m.99.
30. Primary minima:HJD(TT) | ± |
2454780.2127 | 0.0004 |
2455511.2564 | 0.0005 |
2455518.2398 | 0.0006 |
MinII=15m.68.
31. Primary minima:HJD(TT) | ± |
2454727.3145 | 0.0009 |
2454780.2173 | 0.0004 |
2455504.1824 | 0.0003 |
2455518.2422 | 0.0003 |
MinII=13m.57.
32. Period 0d.086636 is also possible. Maxima:HJD(TT) | ± |
2454725.3186 | 0.0009 |
2454726.359 | 0.001 |
2454727.3069 | 0.0005 |
2454745.3359 | 0.0006 |
2454779.2080 | 0.0004 |
2454780.2520 | 0.0008 |
2454781.1970 | 0.0005 |
2455504.1698 | 0.0009 |
2455504.262 | 0.001 |
2455507.2961 | 0.0005 |
2455512.233 | 0.001 |
2455515.2677 | 0.0009 |
2455516.219 | 0.001 |
2455518.2094 | 0.0007 |
33. Primary minimum: HJD(TT) 2455504.205 ± 0.001. MinII=16m.20.
Remarks:
During observations of the field of Nova V458 Vul, we discovered 34 new variable
stars.
Our observations were carried out at the Astrotel-Caucasus observatory, located at
the Astronomical station
of the Kazan Federal university, using the 300-mm Ritchey–Chretien telescope,
equipped
with Apogee
Alta U9000 CCD camera with Johnson–Cousins V filter.
A total of 619 images with 5-minute exposures were obtained on JD 2454725 –
2455518.
For basic reductions for dark current, flat fields, bias, and for removing cosmic
rays hits 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 1050-15501592
(α = 19h53m57s.35, δ = +20°52′
11″.5,
J2000; 2MASS);
V = 11m.99 from the FONAC catalogue (Kislyuk et al.
1999).
The coordinates of the variable stars in the Table were drawn from the 2MASS catalogue
(Skrutskie et al. 2006) except for the stars USNO-A2.0 1050-15373852 and USNO-A2.0
1050-15585370; their coordinates
were drawn from the USNO-A2.0 catalogue
(Monet et al. 1998). All times in the Table and Comments are expressed in the Terrestrial
Time in accordance with IAU
recommendations (resolution B1 XXIII IAU GA).
For search for periods and epochs of extrema we use Peranso
software.
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
Kislyuk, V., Yatsenko, A., Ivanov, G., et al., 1999, The FON Astrographic
Catalogue (FONAC), Centre de Donnees Astronomiques de Strasbourg, I/261
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 1923, 2005, eds.: Simon, A.; Golovin, A.,
p.79