Secular Variation of the Mode Amplitude-Ratio of the Double-Mode RR Lyrae Star NSVS 5222076

Details Secular Variation of the Mode Amplitude-Ratio of the Double-Mode RR Lyrae Star NSVS 5222076 Secular Variation of the Mode Amplitude-Ratio of the Double-Mode RR Lyrae Star NSVS 5222076

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010javso..38....1h&link_type=abstract

The Journal of the American Association of Variable Star Observers, vol. 38, no. 1, p. 1

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Scientific paper

In 2008, a campaign of time-series observations (Hurdis 2009) was conducted in the V and I bands for NSVS 5222076, a double-mode RR Lyrae (RRd) field star in Bootes. Comparison of those results with the earlier observations of Oaster, Smith, and Kinemuchi (2006) suggested that a rapid and significant decrease might be occurring in the amplitude ratio, A0/A1, of the star's fundamental and first-overtone pulsation modes. To follow up on this interesting result,another campaign of time-series observations was conducted in 2009. We find that the amplitude ratio has indeed decreased in the V-band, from 1.93 in 2005 to 1.76 in 2008 to 1.48 in 2009.

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