DOUBLE MODE CEPHEIDS IN M31

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 d...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 778; no. 2; pp. 147 - 6
Main Author Poleski, Radosław
Format Journal Article
LanguageEnglish
Published United States 01.12.2013
Subjects
Aliasing
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Cepheid variables
CEPHEIDS
GALAXIES
MAGELLANIC CLOUDS
OSCILLATIONS
Pulsation
PULSATIONS
RESONANCE
Searching
Stars
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Summary: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.
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ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/778/2/147