Comments:
1. Primary minima:HJD(TT) | +/- |
2455131.3340 | 0.0006 |
2455153.3618 | 0.0002 |
MinII=15m.19.
2. Primary minimum: HJD(TT) 2455167.397 +/- 0.001. MinII=14m.97.
3. Primary minimum: HJD(TT) 2455154.358 +/- 0.001. MinII=18m.93.
4. Infrared colors J-H=0.543, H-K=0.133, J-K=0.676 (2MASS) are consistent with
dK
spectral type (Bessell and Brett 1988) and BY classification.
6. Primary minima: HJD(TT) | +/- |
2455119.4714 | 0.0005 |
2455124.4574 | 0.0004 |
2455125.4514 | 0.0003 |
2455126.4473 | 0.0005 |
2455148.3697 | 0.0006 |
2455154.3524 | 0.0004 |
2455167.3080 | 0.0007 |
MinII=17m.10.
7. Primary minima: HJD(TT) | +/- |
2455125.4413 | 0.0007 |
2455148.3971 | 0.0009 |
2455154.331 | 0.001 |
MinII=18m.18.
8. Primary minima: HJD(TT) | +/- |
2455124.4326 | 0.0008 |
2455125.455 | 0.002 |
2455126.478 | 0.001 |
9. Primary minima: HJD(TT) | +/- |
2455124.4732 | 0.0009 |
2455125.4125 | 0.0007 |
2455146.3293 | 0.0005 |
2455153.3780 | 0.0007 |
2455154.3201 | 0.0009 |
2455159.2544 | 0.0007 |
2455160.193 | 0.001 |
MinII=18m.36.
10. Infrared colors J-H=0.391, H-K=0.109, J-K=0.500 (2MASS) are consistent with
dK
spectral type (Bessell and Brett 1988) and BY: classification.
11. Primary minima: HJD(TT) | +/- |
2455132.3680 | 0.0009 |
2455153.3735 | 0.0005 |
MinII=18m.44.
12. Infrared colors J-H=0.391, H-K=0.062, J-K=0.453 (2MASS) are consistent with
RS
classification.
Primary minima:HJD(TT) | +/- |
2455125.354 | 0.001 |
2455153.3794 | 0.0009 |
2455154.3153 | 0.0006 |
MinII=15m.94.
13. Primary minimum: HJD(TT) 2455131.428 +/- 0.001. MinII=16m.48.
14. Primary minima: HJD(TT) | +/- |
2455124.4684 | 0.0009 |
2455125.4372 | 0.0005 |
2455154.398 | 0.001 |
2455160.1935 | 0.0008 |
2455167.435 | 0.002 |
MinII=15m.86.
15. Blazhko effect. On the phased light curve, black points correspond to observations
on JD
2455118-2455132; red points, on JD 2455146-2455158; green points, on JD 2455159-2455176.
Four maxima: HJD(TT) | +/- |
2455129.4685 | 0.0005 |
2455146.3429 | 0.0004 |
2455147.4273 | 0.0008 |
2455153.3891 | 0.0007 |
16. Maxima: HJD(TT) | +/- |
2455119.450 | 0.0015 |
2455125.437 | 0.0011 |
2455146.323 | 0.0017 |
2455153.3696 | 0.0009 |
2455154.3039 | 0.0009 |
17. Primary minima: HJD(TT) | +/- |
2455146.3327 | 0.0009 |
2455153.3501 | 0.0009 |
MinII=18m.37.
18. Primary minima: HJD(TT) | +/- |
2455124.3332 | 0.0005 |
2455146.3292 | 0.0005 |
2455160.204 | 0.001 |
MinII=17m.32.
19. Primary minima: HJD(TT) | +/- |
2455148.4203 | 0.0006 |
2455154.3137 | 0.0007 |
MinII=17m.92.
20. Period 8d.77 and type ELL: are possible. Infrared colors J-H=0.157,
H-K=0.077, J-K=0.234 (2MASS) are consistent with dF spectral type (Bessell and Brett
1988).
21. MinII=16m.43.
22. Infrared colors J-H=0.744, H-K=0.221, J-K=0.965 (2MASS) are consistent with
K
spectral type (Bessell and Brett 1988) and BY: classification.
23. Infrared colors J-H=0.326, H-K=0.023, J-K=0.349 (2MASS) are consistent with
RRC classification.
Maxima: HJD(TT) | +/- |
2455125.3756 | 0.0010 |
2455154.3424 | 0.0008 |
24. Primary minima: HJD(TT) | +/- |
2455124.4435 | 0.0002 |
2455128.4763 | 0.0008 |
2455159.2853 | 0.0006 |
2455167.3546 | 0.0007 |
MinII=16m.97.
25. Infrared colors J-H=0.575, H-K=0.270, J-K=0.845 (2MASS) are consistent with
K
spectral type (Bessell and Brett 1988) and BY classification.
26. Infrared colors J-H=0.603, H-K=0.202, J-K=0.805 (2MASS) are consistent with
dK
spectral type (Bessell and Brett 1988) and BY classification.
27. Primary minimum: HJD(TT) 2455159.2500 +/- 0.0006. MinII=17m.79.
Remarks:
During observations of a field in Auriga, we discovered 27 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 776 images with 5-minute exposures were obtained on JD 2455119 - 2455176.
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 1200-02802479 = USNO-B1.0 1257-0088583
(RA=05:04:28.582, Dec=+35:45:24.61, J2000, 2MASS) R1=13m.86,
R2=13m.54
(USNO-B1.0)
Unfiltered magnitudes were calibrated using the comparison star, assuming Rcomp=13m.70.
The coordinates of the variable stars in the table were drawn from the 2MASS catalogue
(Skrutskie et al. 2006). For search for periods and epochs of extrema, we use Peranso
software (www.peranso.com)
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
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
Skrutskie, M.F., Cutri, R.M., Stiening, R., et al., 2006, AJ, 131, 1163