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"Peremennye Zvezdy", Prilozhenie, vol. 10, N 28 (2010)

TYC 717 1091 1, a New Double-Mode RR Lyrae Variable Star, Pulsating in the First and Second Overtone Modes

A. V. Khruslov
Tula, Russia

ISSN 2221–0474

Received:   13.11.2010;   accepted:   16.11.2010
(E-mail for contact: khruslov@bk.ru)

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Star Name: TYC 717 1091 1, ASAS 060623+0803.8 Coordinates (J2000): 06 06 23.08, +08 03 48.7 Variability type: RR(B);   Limits, System: 10.95 - 11.5 (V);     Period: (see Remarks) d;   Epoch: JD (see Remarks)

Remarks:

The variability of TYC 717 1091 1 = ASAS 060623+0803.8 was reported by Pojmański (2002). ASAS 060623+0803.8 was listed in the ASAS catalog of variable stars as a MISC/RRC variable star with the period 1.000000 d. In 2006, M. Koppelman (http://www.aavso.org/vsx/index.php?view=detail.top&oid=78946 and http://www.aavso.org/vsx/docs/78946/44/GSC717-1091.jpg) found the RRC nature of its variability with a period of 0.33225 days. I re-analysed the ASAS-3 data using the period-search software developed by Dr. V.P. Goranskij for Windows environment. I find that TYC 717 1091 1 is actually an RR Lyrae variable star, pulsating in the first and second overtone modes (an extension of the GCVS RR(B) type, which is defined as fundamental-mode and first-overtone pulsators). The phased light curves plotted for the tabulated elements are shown in the Figure. Mode Frequency, c/d Semi-amplitude, V mag Period, day Epoch, JD f1 3.010758 0.190 0.3321423 2453706.641 f2 3.767927 0.024 0.2653979 2453706.651 2f2 7.535829 0.012 0.1326994 2453706.632 2f1 6.020361 0.011 0.1661030 2453706.635 f1+f2 6.778710 0.010 0.1475207 2453706.647 The period ratio P2/P1 = 0.7990 is typical of double-mode variables pulsating in the first and second overtone modes. The tabulated coordinates of the variable were drawn from the Tycho2 catalog. B-V = 0.554 (Tycho2), J-H = 0.197 (2MASS).

References:

Pojmański, G., 2002, Acta Astron., 52, 397