Abstract

In 2012–2014 we obtained 3296 CCD frames in the \(BVI_{c}\) photometric system for the RR Lyrae star T Men with the 76-cm telescope of the South African Astronomical Observatory (SAAO, SAR) and the 1-m telescopes of the Las Cumbres Observatory Global Telescope (LCOGT). Our observations showed a slightly increased scatter of data points on the light curve, which allowed the Blazhko effect with a period \({\sim}18\overset{\textrm{d}}{.}49\) to be detected. To study the variability of the pulsation period, we used all the available observations, including 1325 magnitude estimates from the digitized Harvard Astronomical Plate Collection (the DASCH project). This allowed us to construct an \(O-C\) diagram spanning a time interval of 125 years and for the first time to detect at least three abrupt changes in the pulsation period.

中文翻译：

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RRab可变T型人：周期变异性和Blazhko效应

摘要

在2012–2014年，我们使用南非天文台（SAAO，SAR）的76厘米望远镜和1-m望远镜为拉里拉星T Men的\（BVI_ {c} \）光度系统获得了3296个CCD镜框。Las Cumbres天文台全球望远镜（LCOGT）的望远镜。我们的观察结果表明，光曲线上数据点的散射略有增加，这使得可以检测到周期为（{\ sim} 18 \ overset {\ textrm {d}} {。} 49 \）的Blazhko效应。为了研究脉动周期的变化性，我们使用了所有可用的观测值，包括来自数字化哈佛天文板收藏集（DASCH项目）的1325个量级估计。这使我们可以构造一个\（OC \） 该图跨越了125年的时间间隔，并首次检测到脉动周期中至少三个突变。