AAS 205th Meeting, 9-13 January 2005
Session 54 Pulsating Stars: RR Lyraes, Miras, Cepheids, etc.
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[54.05] A New, Bright Galactic RRd Star

M.D. Koppelman (University of Minnesota), P. Wils (Vereniging Voor Sterrenkunde, Belgium), D.L. Welch (McMaster University), R. Durkee (Shed of Science Observatory, Minneapolis, MN), J. Vidal-Sáinz (Grup d'Estudis Astronomics, Barcelona, Spain)

We have identified a new, bright double-mode RR Lyr-type variable in the Northern Sky Variable Survey (NSVS 5152353 = GSC 3047-176). This find significantly increases the sample of RRd variables known in the galactic field which are bright enough for high-resolution spectroscopic analysis. RRd variables provide a sensitive test of theoretical pulsation models. Incorporating high-precision follow-up photometry on 32 nights during 2004, we find that the two dominant photometric periods for this star are P0=0.35298 ±0.00002 days and P1=0.47460 ±0.00004 days. No fewer than 11 significant frequencies are apparent in the power spectrum of the time series. The star is located in Boötes at J2000.0 coordinates 14:53:39.93 +40:31:43.4 and has a mean apparent magnitude of approximately V=12.5.

The author(s) of this abstract have provided an email address for comments about the abstract: michael@aps.umn.edu

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.