Peremennye Zvezdy

"Peremennye Zvezdy",
Prilozhenie
,
vol. 12, N 20 (2012)

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)


#NameOtherCoord (J2000)TypeMaxMinSystemPeriodEpoch (JD)typeSpCommentL.CurveFind.ChartData
1 2MASS 06540171-073958806 54 01.71, -07 39 58.9SR13.1613.26V26.652455922.5max Comm. 11.jpgch1.jpg1.txt
2 2MASS 08182270-364037708 18 22.70, -36 40 37.8EW14.8015.5:V0.308022455191.525min Comm. 22.jpgch2.jpg2.txt
3 GSC 07148-0292908 39 08.62, -37 20 46.2SR:12.0312.16V302455195.4max Comm. 33.jpgch3.jpg3.txt
4 2MASS 08412219-435256208 41 22.19, -43 52 56.3EW14.0814.54V0.3623982455169.607min Comm. 44.jpgch4.jpg4.txt
5 2MASS 09082209-533025109 08 22.09, -53 30 25.1SR:13.5813.72V162455212.4max Comm. 55.jpgch5.jpg5.txt
6 GSC 08612-0149610 19 53.68, -59 01 05.9SR:13.1313.25V16.62455181.5max Comm. 66.jpgch6.jpg6.txt
7 GSC 08613-0229610 32 00.89, -58 16 02.2EA10.1010.40V3.92962454648.507minK0Comm. 77.jpgch7.jpg7.txt
8 GSC 08965-0171410 48 41.66, -64 09 51.2SR:12.6012.80V32.12455203.5max Comm. 88.jpgch8.jpg8.txt
9 2MASS 15203087-784015315 20 30.88, -78 40 15.4RRC16.3516.75V0.2615052455686.308max Comm. 99.jpgch9.jpg9.txt
10 2MASS 16204376-713938416 20 43.77, -71 39 38.5EW15.1015.95V0.4063912456074.467min Comm. 1010.jpgch10.jpg10.txt
11 2MASS 16211597-533320416 21 15.98, -53 33 20.4EW:14.4515.20V0.83302456072.309min Comm. 1111.jpgch11.jpg11.txt
12 2MASS 16411862-474047516 41 18.62, -47 40 47.5EB14.1515.10V0.3911632456056.312min Comm. 1212.jpgch12.jpg12.txt
13 2MASS 19220701-113833119 22 07.01, -11 38 33.2EW16.717.4V0.299582456045.611min Comm. 1313.jpgch13.jpg13.txt

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. MinII = 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. MinII = 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. MinII = 15.60V.

11. B–V = 0.7, J–K = 0.753.

12. B–V = 1.0, J–K = 0.588. MinII = 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



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