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"Peremennye Zvezdy", Prilozhenie, vol. 10, N 32 (2010)

TYC 3877 02198 1, a New Multiperiodic RR Lyrae Variable Star with First-Overtone and Non-Radial Pulsations

A. V. Khruslov
Tula, Russia

ISSN 2221–0474

Received:   24.10.2010;   accepted:   1.12.2010
(E-mail for contact: khruslov@bk.ru)

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Star Name: TYC 3877 02198 1, NSVS 2823967, NSVS 5215596 Coordinates (J2000): 16 16 30.79, +54 23 21.9 Variability type: RRC;   Limits, System: 11.65 - 12.0 (R);     Period: (see Remarks) d;   Epoch(max): JD (see Remarks)

Remarks:

TYC 3877 02198 1 is a new multiperiodic RR Lyrae variable star. Besides clearly expressed first-overtone radial pulsations, it shows at least two non-radial modes according to ROTSE1 data (Wozniak et al. 2004; also see http://skydot.lanl.gov/nsvs). These observations were analyzed using the period-search software developed by Dr. V.P. Goranskij for Windows environment. The following light elements are used to plot the phased light curves: Mode Frequency, c/d Semi-amplitude, mag (R) Period, day Epoch, JD f1 3.2648 0.083 0.30630 2451420.777 f2 3.2100 0.042 0.31153 2451420.692 f3 3.3229 0.025 0.30094 2451420.843 The frequency f4 (3.2678 c/d, see the Figure) is probably spurious. RR Lyrae variables with equidistant triplets of frequencies (two non-radial frequencies around the first-overtone mode) have been known for some time in the LMC (Alcock et al. 2000). J-H = 0.084 (2MASS), B-V = 0.411 (Tycho2). The coordinates were drawn from the Tycho-2 catalog.

References:

Alcock, C., Allsman, R., Alves, D.R., et al., 2000, Astrophys. J., 542, 257 Wozniak, P.R., Vestrand, W.T., Akerlof, C.W., et al., 2004, Astron. J., 127, 2436