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USNO-B1.0 1171-0309158: An RR Lyrae Star that Switched from a Double- to Single-Mode Pulsation

Khruslov A. V., Kusakin A. V., Reva I. V.

Acta Astronomica

2017

Vol. 67, No. 4

317--327

We report the discovery of a new case of an RR Lyr star that experienced a switching of its pulsation mode. We detected USNO-B1.0 1171-0309158 as a double-mode RR Lyr star from observations of the Catalina Surveys that showed additional scattering on the light curve. Our analysis of the time-series of CSS data showed gradual increase in scattering and in the amplitude of fundamental pulsation mode. Our CCD observations carried out in 2015-2017 reveal that this object is now a fundamental-mode RRab star, with no sign of the first-overtone pulsation.