The OGLE Collection of Variable Stars. Type II Cepheids in the Magellanic System

IF 2 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Acta Astronomica Pub Date : 2018-06-01 DOI:10.32023/0001-5237/68.2.1
I. Soszyński, A. Udalski, M. Szymański, Ł. Wyrzykowski, K. Ulaczyk, R. Poleski, P. Pietrukowicz, S. Kozłowski, D. Skowron, J. Skowron, P. Mr'oz, K. Rybicki, P. Iwanek
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引用次数: 11

Abstract

We present a nearly complete collection of type II Cepheids in the Magellanic System. The sample consists of 338 objects: 285 and 53 variables in the Large and Small Magellanic Clouds, respectively. Based on the pulsation periods and light-curve morphology, we classified 118 of our type II Cepheids as BL Herculis, 120 as W Virginis, 34 as peculiar W Virginis, and 66 as RV Tauri stars. For all objects, we publish time-series VI photometry obtained during the OGLE-IV survey, from 2010 to the end of 2017. We present the most interesting individual objects in our collection: 16 type II Cepheids showing additional eclipsing or ellipsoidal variability, two RV Tau variables more than 2.5 mag fainter than other stars of this type in the LMC, an RVb star that drastically decreased the amplitude of the long-period modulation, type II Cepheids exhibiting significant amplitude and period changes, and an RV Tau star which experiences interchanges of deep and shallow minima. We show that peculiar W Vir stars have markedly different spatial distribution than other subclasses of type II Cepheids, which indicates different evolutionary histories of these objects.
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OGLE变星收藏。麦哲伦系统中的II型造父变星
我们展示了麦哲伦系统中几乎完整的II型造父变星集合。样本由338个物体组成:大麦哲伦星云和小麦哲伦云中分别有285个和53个变量。根据脉动周期和光曲线形态,我们将118颗II型造父变星归类为BL Herculis,120颗归类为W Virginis,34颗归类为特殊的W Virgins,66颗归类为RV Tauri星。对于所有物体,我们公布了从2010年到2017年底OGLE-IV调查期间获得的时间序列VI测光。我们展示了我们收藏的最有趣的单个天体:16个II型造父变星显示出额外的食或椭球变化,两个RV-Tau变星比LMC中的其他此类恒星暗2.5磁以上,一个RVb恒星大幅降低了长周期调制的振幅,II型造母变星表现出显著的振幅和周期变化,以及一颗RV Tau星,它经历了深度和浅层极小值的互换。我们发现,与II型造父变星的其他亚类相比,独特的W Vir恒星具有明显不同的空间分布,这表明这些天体的进化历史不同。
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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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