DOUBLE MODE CEPHEIDS IN M31

被引：7

作者：

Poleski, Radosllaw ^{[1
]}

机构：

[1] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 778卷 / 02期

关键词：

galaxies: individual (M31); stars: oscillations; stars: variables: Cepheids; GRAVITATIONAL LENSING EXPERIMENT; LARGE-MAGELLANIC-CLOUD; OGLE-III CATALOG; PS1 PANDROMEDA DATA; CLASSICAL CEPHEIDS; ANDROMEDA GALAXY; DISTANCE DETERMINATION; ECLIPSING BINARIES; PERIOD-LUMINOSITY; BEAT CEPHEIDS;

D O I：

10.1088/0004-637X/778/2/147

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Until now, double mode Cepheids (or beat Cepheids) were known only in the Galaxy, the Magellanic Clouds, and M33. Curiously, none of the more than 2000 Cepheids in M31 was claimed to show two pulsation modes. We conducted a systematic search for double mode Cepheids in the archival data of M31 and discovered four such objects. We identify one of the stars as a first and second overtone pulsator even though its secondary period is subject to strong aliasing. Two stars pulsate in the fundamental mode and the first overtone. Their fundamental periods are 9.392 days and 9.163 days. This makes them the first candidates for fundamental mode and first overtone Cepheids, of which double mode pulsations are caused by the 2: 1 resonance of the fundamental mode and the second overtone.

引用

页数：6

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