Types of Variability and Light Elements for 13 New Variables.

L. N. Berdnikov^#1, E. N. Pastukhova^#2

#1. Sternberg Astronomical Institute, Lomonosov State University, Moscow, Russia; #2. Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia

Received:   9.11.2012;   accepted:   6.12.2012
(E-mail for contact: leonid.berdnikov@gmail.com, pastukhova@sai.msu.ru)

Comments:


1. B–V = 2.2, J–K = 1.416. ASAS-3 data were used to improve the results.

2. B–V = 0.8, J–K = 0.440.

3. B–V = 2.0, J–K = 1.354.

4. B–V = 0.8, J–K = 0.483. Min_II = 14.51V.

5. B–V = 2.0, J–K = 1.263.

6. B–V = 1.0, J–K = 0.739.

7. B–V = 0.2, J–K = 0.151. Min_II = 10.39V, D = 0.10P. ASAS-3 data were used to improve the results.

8. B–V = 2.0, J–K = 1.332.

9. B–V = 0.3, J–K = 0.736. M–m = 0.40.

10. B–V = 0.7, J–K = 0.381. Min_II = 15.60V.

11. B–V = 0.7, J–K = 0.753.

12. B–V = 1.0, J–K = 0.588. Min_II = 14.7:V. ASAS-3 data were used to improve the results.

13. B–V = 1.0, J–K = 0.497.

Remarks:
In 2008–2012, we performed CCD observations of selected variable stars with the 76-cm telescope of the South African Astronomical Observatory (SAAO, Republic of South Africa). An SBIG ST-10XME CCD camera equipped with BVI filters of the Kron–Cousins system (Cousins 1976) was used. As a by-product of these observations, we discovered and studied 13 new variable stars. For period determination, we made use of the WinEfk software provided by V.P. Goranskij (Sternberg Astronomical Institute). In several cases, we were able to confirm brightness variations and improve variability periods using the publicly available electronic archive of CCD observations of the ASAS-3 project (Pojmanski 2002).

Acknowledgments: Our studies are supported by grants from the Russian Foundation for Basic Research (grant No. 10-02-00489) and from the Program "Origin and Evolution of Stars and Galaxies" of the Presidium of Russian Academy of Science. Thanks are due to Dr. V.P. Goranskij for providing us with his period-determination software. L.N.B. wishes to thank the administration of the SAAO for allocation of telescope time. The study was partially supported by the Russian Foundation for Basic Research through grant No. 11-02-00495.

References:
Cousins, A.W.J., 1976, Mem. Royal Astron. Soc., 81, 25
Pojmanski, G., 2002, Acta Astron., 52, 397