A Study of Seventeen Variable Stars

E. V. Kazarovets, E. N. Pastukhova
Institute of Astronomy, Russian Academy of Sciences, Moscow, Russia

Received:   7.06.2008;   accepted:   23.06.2008
(E-mail for contact: helene@inasan.ru, pastukhova@sai.msu.ru)

Comments:
1. Classified as an EC/CW star in the ASAS-3 catalogue.

2. The variability was discovered by Chen et al. (2006) who classified the star as a Mira with P = 200d.

3. The ASAS-3 range is for the combined brightness of the Mira and its neighbor.

4. M-m = 0.13.

7. MinI = MinII. D = 0.21.

8. M-m = 0.15.

11. The brightness limits from Luyten (1933b) are 15.4 - 18.2 pg.

12. The ASAS-3 range is for the combined brightness of the Mira and its neighbor. The limits, given in the Table, are our eye estimates of the star's brightness on the red images from the USNO Image and Catalogue Archive.

13. Classified as a CWA star in the ASAS-3 catalogue.

14. The ASAS-3 range is for the combined brightness of the Mira and its neighbor; classified as a CW star in the ASAS-3 catalogue.

15. Classified as a CW star in the ASAS-3 catalogue.

16. Classified as a CW star in the ASAS-3 catalogue. The ASAS-3 range is for the combined brightness of the SRA and its neighbor. Possibly a Mira variable.

17. Classified as a MISC star in the ASAS-3 catalogue and as a possible CW star with a period about 11 days in Richter (1970). J - K = 1.1 (2MASS).

Remarks:
We could study the variables thanks to the publicly available electronic archives of CCD observations of the ASAS-3 (Pojmanski, 2002), ROTSE-I/NSVS (Wozniak et al., 2004) surveys and the US Naval Observatory Image and Catalogue Archive (http://www.nofs.navy.mil/data/FchPix/). We recovered the variables NSV6438, NSV6447 and NSV6495 suspected by Luyten (1934), NSV6448 and NSV6507 suspected by Luyten (1933a), NSV6446 and NSV6532 suspected by Luyten (1933b). Finding charts for these suspected variables have been never published.

Our studies are supported by grants from the Russian Foundation for Basic Research (grant No. 08-02-00375), from the Program "Origin and Evolution of Stars and Galaxies" of the Presidium of Russian Academy of Science, and from the Program of Support for Leading Scientific Schools of Russia (grant No. NSh 433.2008.2).

References:
Chen, Y.-T., Chen, W.-P., Hsiao, W.-S., Jiang, X., 2006, IBVS, No. 5700 (star No. 10)
Luyten, W.J., 1933a, AN, 249, 397
Luyten, W.J., 1933b, AN, 250, 260
Luyten, W.J., 1934, AN, 253, 136
Pojmanski, G., 2002, Acta Astronomica, 52, 397
Richter, G.A., 1970, Mitt. Veraend. Sterne, 5, 99
Wozniak, P.R., Vestrand, W.T., Akerlof, C.W. et al., 2004, Astron. J., 127, 2436