Comments:
1. Primary minimum: HJD(TT) 2455512.4298 ± 0.0006. MinII = 16m.93.
2. Primary minimum: HJD(TT) 2455502.3248 ± 0.0003. MinII = 16m.80.
3. Primary minima:HJD(TT) | ± |
2455496.2931 | 0.0002 |
2455502.3091 | 0.0003 |
2455503.3100 | 0.0004 |
2455521.3565 | 0.0002 |
2455529.3730 | 0.0004 |
MinII
= 14m.76.
4. MinII = 19m.00.
5. Primary minimum: HJD(TT) 2455571.2139 ± 0.0009. MinII = 17m.03.
6. Despite its infrared colors (J–H = 0.122, H–K = 0.027 and J–K
= 0.149, 2MASS),
we tentatively suggest the RS: classification.
7. Primary minimum: HJD(TT) 2455538.2660 ± 0.0008. MinII = 18m.32.
8. O'Connell effect. Primary minimum: HJD(TT) 2455573.232 ± 0.002. MinII
= 16m.60.
9. Primary minima:HJD(TT) | ± |
2455512.434 | 0.001 |
2455538.221 | 0.001 |
2455573.236 | 0.001 |
2455574.195 | 0.001 |
MinII
= 16m.03.
10. Primary minimum: HJD(TT) 2455540.2057 ± 0.0003. MinII = 17m.04.
11. Maxima:HJD(TT) | ± |
2455496.2950 | 0.0005 |
2455521.3565 | 0.0005 |
2455537.1876 | 0.0005 |
2455538.1874 | 0.0006 |
2455538.2742 | 0.0003 |
2455540.2642 | 0.0005 |
2455571.2042 | 0.0004 |
2455572.1990 | 0.0004 |
2455573.1954 | 0.0005 |
2455574.1877 | 0.0005 |
2455596.1746 | 0.0002 |
12. Infrared colors J–H = 0.659, H–K = 0.207 and J–K = 0.866
(2MASS) are consistent with the
K spectral type (Bessell and Brett 1988) and BY: classification.
13. Infrared colors J–H = 0.329, H–K = 0.178 and J–K = 0.507
(2MASS) are consistent with the
G or K spectral type (Bessell and Brett 1988) and BY: classification.
14. MinII = 16m.97.
15. Primary minima:HJD(TT) | ± |
2455571.2574 | 0.0007 |
2455572.2489 | 0.0006 |
2455573.2453 | 0.0004 |
MinII
= 18m.68.
16. Primary minimum: HJD(TT)2455538.2000 ± 0.0008. MinII = 16m.84.
If the tabulated period is correct, then the orbit is eccentric, with the secondary
minimum at phase 0.47.
17. Primary minimum: HJD(TT) 2455571.221 ± 0.001. MinII = 18m.28.
18. Depth of primary minimum varies. Primary minima:HJD(TT) | ± |
2455520.4077 | 0.0007 |
2455540.2486 | 0.0006 |
2455571.2015 | 0.0001 |
MinII
= 17m.56.
19. Infrared colors J–H = 0.460, H–K = 0.073 and J–K = 0.533
(2MASS) are consistent with the
K spectral type (Bessell and Brett 1988) and BY: classification.
20. Primary minimum: HJD(TT) 2455521.3620 ± 0.0003. MinII = 15m.39.
21. Infrared colors J–H = 0.233, H–K = 0.173 and J–K = 0.406
(2MASS) are consistent with the
K: spectral type (Bessell and Brett 1988) and BY: classification.
22. Infrared colors J–H = 1.214, H–K = 0.404 and J–K = 1.618
(2MASS) are consistent with the
M spectral type (Bessell and Brett 1988) and SR: classification.
23. MinII = 14m.25.
24. MinII = 14m.42:.
Remarks:
During observations of the field in Auriga, we discovered 24 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 571 images with 5-minute exposures were obtained on JD 2455503–2455601.
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 1275-04592684 = USNO-B1.0 1287-0109706
(α = 05h15m41s.84, δ = +38°42′
02″.3
(J2000, 2MASS)),
R1 = 13m.97, R2 = 13m.85
(USNO-B1.0). Unfiltered magnitudes were calibrated using the comparison star, assuming
Rcomp = 13m.91.
The coordinates of the variable stars in the table were drawn from the 2MASS catalogue
(Skrutskie et al. 2006).
We searched for periods and epochs of extrema using 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
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