USNO-B1 .0 1171-0309158：从双模脉冲转换为单模脉冲的RR Lyrant Star
USNO-B1.0 1171-0309158: An RR Lyrae Star that Switched from a Double- to Single-mode Pulsation
摘要：
我们报告发现了一个新的情况下，RR天琴座恒星经历了切换其脉动模式。我们发现USNO-B1.0 1171-0309158是一颗双模RR型天琴座星，来自卡特琳娜巡天（CSS）的观测，在光变曲线上显示出额外的散射。我们的CSS数据的时间序列的分析表明，散射和基本脉动模式的振幅逐渐增加。我们在2015年进行的CCD观测显示，该天体现在是一颗基模RRab星，没有第一泛音脉动的迹象。
英文摘要：
We report the discovery of a new case of an RR Lyrae star that experienced a switching of its pulsation mode. We detected USNO-B1.0 1171-0309158 as a double-mode RR Lyrae star from observations of the Catalina surveys (CSS) 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 reveal that this object is now a fundamental-mode RRab star, with no sign of the first-overtone pulsation.
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