A Double-Mode RR Lyrae Star with a Strong Fundamental Mode Component

Abstract

NSVS 5222076, a thirteenth magnitude star in the Northern Sky Variability Survey, was identified by Oaster as a possible new double-mode RR Lyrae star. We confirm the double-mode nature of NSVS 5222076, supplementing the survey data with new V band photometry. NSVS 5222076 has a fundamental mode period of 0.4940 day and a first overtone period of 0.3668 day. Its fundamental mode light curve has an amplitude twice as large as that of the first overtone mode, a ratio very rarely seen. Data from the literature are used to discuss the location in the Petersen diagram of double-mode RR Lyrae stars having strong fundamental mode pulsation. Such stars tend to occur toward the short period end of the Petersen diagram, and NSVS 5222976 is no exception to this rule.

arXiv comment14 pages, 4 figures, To be published in the March, 2006, issue of PASP

References in corpus (8)

• Northern Sky Variability Survey (NSVS): Public data release
• CU Comae: a new field double-mode RR Lyrae, the most metal poor discovered to date
• The MACHO Project LMC Variable Star Inventory IV: Multimode RR Lyrae Stars, Distance to the LMC and Age of the Oldest Stars
• Fourier decomposition and frequency analysis of the pulsating stars with P < 1day in the OGLE database. II. Multiperiodic RR Lyrae variables in the Galactic Bulge
• RR Lyrae stars in the Sagittarius dwarf galaxy: Period analysis
• Automated Nonlinear Stellar Pulsation Calculations: Applications to RR Lyrae stars. The Slope of the Fundamental Blue Edge and the First RRd Model Survey
• Image-Subtraction Photometry of the Globular Cluster M3: identification of new double-mode RR Lyrae stars
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Cited by in corpus (10)

• Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes
• Analysis of RR Lyrae Stars in the Northern Sky Variability Survey
• MOST photometry of the RRd Lyrae variable AQ Leo: Two radial modes, 32 combination frequencies, and beyond
• Multicolour CCD photometry of the variable stars in globular cluster M3
• Asteroseismology of Kepler Algol type oscillating eclipsing binaries
• Double-Mode Radial Pulsations among RR Lyrae Stars
• The Changing Lightcurve of the Double-Mode RR Lyrae Variable Star V338 Boo
• Modelling of eclipsing binary systems with pulsating components and tertiary companions: BF Vel and RR Lep
• Asteroseismology of four eccentric double-lined spectroscopic eclipsing binaries
• Caught in the Act: Observations of the Double-mode RR Lyrae V338 Boo During the Disappearance of a Pulsation Mode