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"Peremennye Zvezdy", Prilozhenie, vol. 10, N 11 (2010)

GSC 6957-00065, a New Double-Mode RR Lyrae Variable Star

A. V. Khruslov
Russia, Tula

ISSN 2221–0474

Received:   3.03.2010;   accepted:   11.03.2010
(E-mail for contact: khruslov@bk.ru)

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Star Name: GSC 6957-00065, ASAS 220715-2723.8 Coordinates (J2000): 22 07 15.43, -27 23 44.6 Variability type: RR(B);   Limits, System: 12.8 - 13.5 (R);     Period: (see Remarks) d;   Epoch: JD (see Remarks)

Remarks:

According to ASAS-3 data, GSC 6957-00065 = ASAS 220715-2723.8, listed in the ASAS catalog of variable stars (Pojmański 2002), is an RRAB variable with a period of 0.424900 d. Szczygieł et al. (2009), who consider all the stars analyzed in their paper fundamental-mode RR~Lyrae stars, give the period 0.4248986 d. GSC 6957-00065 is actually an RR(B) star, and the above period values correspond to the first-overtone oscillation. The phased light curves plotted for the tabulated elements are given in the Figure. The period ratio P1/P0 = 0.7457 is typical of RR(B) variables. The fundamental-mode amplitude is much lower than that for the first overtone. Also identified is the period corresponding to the interaction frequency f0+f1. J-H = 0.253 (2MASS). GSC 6957-00065 = ASAS 220715-2723.8 Mode Frequency, c/d Semi-amplitude, V mag Period, day Epoch, HJD f0 1.75508 0.066 0.569776 2453249.320 f1 2.35351 0.194 0.424897 2453249.301 f0+f1 4.10859 0.059 0.243393 2453249.278

References:

Pojmański, G., 2002, Acta Astron., 52, 397 Szczygieł, D.M., Pojmański, G., Pilecki, B., 2009, Acta Astron., 59, 137