群集年龄实验(案例)。球状星团NGC 6362内的变星

IF 2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
M. Rozyczka, I. B. Thompson, W. Pych, W. Narloch, R. Poleski, A. Schwarzenberg-Czerny
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引用次数: 1

摘要

球状星团M22(NGC 6656)的磁场在2000年至2008年间被监测到,以寻找变星$获得了359个周期性、可能的周期性和长期变量的BV$光曲线,其中238个是新的检测。39个新检测到的变量和63个先前已知的变量是该星团的成员或可能的成员,包括20个SX-Phe、10个RRab和16个RRc型波轮、1个BL Her型波轮,21个接触双星和9个分离或半分离食双星。在已识别的天体中,最有趣的是V112——一个明亮的多模SX-Phe波轮,V125——蓝色水平分支上的$\beta$Lyr型双星,V129——一个蓝色/黄色掉队星,具有类似W UMa的光曲线,位于极端水平分支和红巨星分支之间,V134——一个极端水平分支天体,$P=2.33$d,光曲线接近正弦曲线;它们中的所有四个都是集群的固有运动(PM)成员。在非成员中,发现了一个$P=2.83$d的独立食联星,托管着一个$\delta$Sc型脉动器,以及一个特殊的$P=0.93$d联星,具有椭球调制,在正弦曲线的一个下降肩部的中间具有狭窄的最小值。我们还收集了以前已知变量的大量新数据;特别是我们修正了M22的RR-Lyr型变量中Blazhko效应发生的统计数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Clusters AgeS Experiment (CASE). Variable stars in the field of the globular cluster NGC 6362
The field of the globular cluster M22 (NGC 6656) was monitored between 2000 and 2008 in a search for variable stars. $BV$ light curves were obtained for 359 periodic, likely periodic, and long-term variables, 238 of which are new detections. Thirty nine newly detected variables, and 63 previously known ones are members or likely members of the cluster, including 20 SX Phe, 10 RRab and 16 RRc-type pulsators, one BL Her-type pulsator, 21 contact binaries, and 9 detached or semi-detached eclipsing binaries. The most interesting among the identified objects are V112 - a bright multimode SX Phe pulsator, V125 - a $\beta$ Lyr-type binary on the blue horizontal branch, V129 - a blue/yellow straggler with a W UMa-like light curve, located halfway between the extreme horizontal branch and red giant branch, and V134 - an extreme horizontal branch object with $P=2.33$ d and a nearly sinusoidal light curve; all four of them are proper motion (PM) members of the cluster. Among nonmembers, a $P=2.83$ d detached eclipsing binary hosting a $\delta$ Sct-type pulsator was found, and a peculiar $P=0.93$ d binary with ellipsoidal modulation and narrow minimum in the middle of one of the descending shoulders of the sinusoid. We also collected substantial new data for previously known variables; in particular we revise the statistics of the occurrence of the Blazhko effect in RR Lyr-type variables of M22.
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来源期刊
Acta Astronomica
Acta Astronomica 地学天文-天文与天体物理
CiteScore
3.40
自引率
4.50%
发文量
0
审稿时长
>12 weeks
期刊介绍: Information not localized
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