Pulsating stars in ω Centauri Near-IR properties and period-luminosity relations

被引：0

作者：

Navarrete, Camila ^{[1
,2
]}

Catelan, Marcio ^{[1
,2
,3
]}

Contreras Ramos, Rodrigo ^{[1
,2
]}

Alonso-Garcia, Javier ^{[2
,4
]}

Gran, Felipe ^{[1
,2
]}

Dekany, Istvan ^{[5
]}

Minniti, Dante ^{[2
,6
,7
]}

机构：

[1] Pontificia Univ Catolica Chile, Inst Astrofis, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile

[2] Millennium Inst Astrophys, Santiago, Chile

[3] Pontificia Univ Catolica Chile, Ctr Astroingn, Santiago, Chile

[4] Univ Antofagasta, Fac Cs Basicas, Unidad Astron, Ave U Antofagasta 02800, Antofagasta, Chile

[5] Heidelberg Univ, Zentrum Astron, Astron Rech Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany

[6] Univ Andres Bello, Fac Ciencias Exactas, Dept Fis, Ave Fernandez Concha 700, Santiago, Chile

[7] Vatican Observ, V-00120 Vatican City, Vatican

来源：

WIDE-FIELD VARIABILITY SURVEYS: A 21ST CENTURY PERSPECTIVE | 2017年 / 152卷

关键词：

CATALOG;

D O I：

10.1051/epjconf/201715207005

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

omega Centauri (NGC 5139) contains many variable stars of different types, including the pulsating type II Cepheids, RR Lyrae and SX Phoenicis stars. We carried out a deep, wide-field, near-infrared (IR) variability survey of omega Cen, using the VISTA telescope. We assembled an unprecedented homogeneous and complete J and K-S near-IR catalog of variable stars in the field of omega Cen. In this paper we compare optical and near-IR light curves of RR Lyrae stars, emphasizing the main differences. Moreover, we discuss the ability of near-IR observations to detect SX Phoenicis stars given the fact that the amplitudes are much smaller in these bands compared to the optical. Finally, we consider the case in which all the pulsating stars in the three different variability types follow a single period-luminosity relation in the near-IR bands.

引用

页数：6

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