Comments:
1. Type DSCT and period 0d.1441 are also possible. Primary minima:HJD(TT) | ± |
2455870.3295 | 0.0004 |
2455906.3605 | 0.0009 |
MinII
= 13m.68.
2. Primary minima:HJD(TT) | ± |
2455870.4074 | 0.0007 |
2455906.536 | 0.001 |
MinII = 16m.37.
3. MinII = 18m.24.
4. Primary minimum: HJD(TT) 2455906.453±0.005.
5. Primary minima:HJD(TT) | ± |
2455870.4054 | 0.0003 |
2455906.4754 | 0.0007 |
MinII
= 15m.85.
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