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: http://www.astronet.ru/db/varstars/msg/1282687
Дата изменения: Mon Apr 8 17:08:21 2013 Дата индексирования: Mon Mar 3 04:21:48 2014 Кодировка: Поисковые слова: п п р р р р р р р п п п п п п п |
#1. Astrotel Observatory, Karachay-Cherkessia, Russia;
#2. Surgut, Russia. |
Received: 17.03.2013; accepted: 8.04.2013
(E-mail for contact: bredfild@mail.ru, sav@surgut.ru, bs25@mail.ru)
|
Comments:
1. Type DSCT and period 0d.1441 are also possible. Primary minima:MinII = 13m.68.
HJD(TT) ± 2455870.3295 0.0004 2455906.3605 0.0009
2. Primary minima:MinII = 16m.37.
HJD(TT) ± 2455870.4074 0.0007 2455906.536 0.001
3. MinII = 18m.24.
4. Primary minimum: HJD(TT) 2455906.453±0.005.
5. Primary minima:MinII = 15m.85.
HJD(TT) ± 2455870.4054 0.0003 2455906.4754 0.0007
6. A close pair of two stars: USNO-A2.0 1200-02275043 and 2MASS 04274467+3215128, USNO-A2.0 1200-02275043 varies. MinII = 16m.10.
8. Primary minimum: HJD(TT) 2455906.3521±0.0004. MinII = 12m.95.
9. Maxima:
HJD(TT) ± 2455869.360 0.001 2455870.3700 0.0007 2455906.3718 0.0004 2455906.4655 0.0006
10. Primary minimum: HJD(TT) 2455869.3330±0.0009.
11. MinII = 16m.49.
12. Infrared colors J–H = 0.986, H–K = 0.423, J–K = 1.409 (2MASS) are consistent with the M spectral type (Bessell and Brett 1988) and SR: classification. Maximum: HJD(TT) 2455872.5±0.6.Remarks:
During observations of a field in Perseus, we discovered 12 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 an unfiltered Apogee Alta U9000 CCD camera. A total of 256 images with 5-minute exposures were obtained on JD 2455826–2455906. For basic reductions for dark current, flat fields, bias and for removing cosmic-ray 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 1200-02275475 = USNO-B1.0 1224-0079451 (α = 04h27m46s.76, δ = +32°25′ 34″.2 (J2000, 2MASS)), R1 = 13m.97 R2 = 13m.60 (USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp = 13m.785. The coordinates of the variable stars in the table were drawn from the 2MASS catalogue (Skrutskie et al. 2006) except for a star USNO-A2.0 1200-02287405; 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.
Acknowledgements: We would like to thank S. V. Antipin and N. N. Samus for helpful discussion.References:
Bessell, M.S., Brett, J.M., 1988, Publ. Astron. Soc. Pacific, 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, Astron. J., 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