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The beat Cepheids in the Magellanic Clouds: an analysis from the EROS-2 database

Marquette, J B; Beaulieu, J.-P; Buchler, J. R.; Szabo, R.; Tisserand, Patrick; Belghith, S.; Fouque, P; Lesquoy, E.; Milsztajn, A; Schwarzenberg-Czerny, A; Afonso, C; Albert, J.N.

Description

Context. A number of microlensing dark-matter surveys have produced tens of millions of light curves of individual background stars. These data provide an unprecedented opportunity for systematic studies of whole classes of variable stars and their host galaxies.Aims. We aim to use the EROS-2 survey of the Magellanic Clouds to detect and study the population of beat Cepheids (BCs) in both Clouds. BCs pulsating simultaneously in the first overtone and fundamental modes (FO/F) or in the second...[Show more]

dc.contributor.authorMarquette, J B
dc.contributor.authorBeaulieu, J.-P
dc.contributor.authorBuchler, J. R.
dc.contributor.authorSzabo, R.
dc.contributor.authorTisserand, Patrick
dc.contributor.authorBelghith, S.
dc.contributor.authorFouque, P
dc.contributor.authorLesquoy, E.
dc.contributor.authorMilsztajn, A
dc.contributor.authorSchwarzenberg-Czerny, A
dc.contributor.authorAfonso, C
dc.contributor.authorAlbert, J.N.
dc.date.accessioned2015-12-08T22:20:13Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/31892
dc.description.abstractContext. A number of microlensing dark-matter surveys have produced tens of millions of light curves of individual background stars. These data provide an unprecedented opportunity for systematic studies of whole classes of variable stars and their host galaxies.Aims. We aim to use the EROS-2 survey of the Magellanic Clouds to detect and study the population of beat Cepheids (BCs) in both Clouds. BCs pulsating simultaneously in the first overtone and fundamental modes (FO/F) or in the second and first overtone modes (SO/FO) are of particular interest.Methods. Using special software designed to search for periodic variables, we have scanned the EROS-2 data base for variables in the typical period range of Cepheids. Metallicities of FO/F objects were then calculated from linear nonadiabatic convective stellar models.Results. We identify 74 FO/F BCs in the LMC and 41 in the SMC, and 173 and 129 SO/FO pulsators in the LMC and SMC, respectively; 185 of these stars are new discoveries. For nearly all the FO/F objects we determine minimum, mean, and maximum values of the metallicity.Conclusions. The EROS data have expanded the samples of known BCs in the LMC by 31%, in the SMC by 110%. The FO/F objects provide independent measures of metallicities in these galaxies. The mean value of metallicity is 0.0045 in the LMC and 0.0018 in the SMC.
dc.publisherSpringer
dc.sourceAstronomy and Astrophysics
dc.subjectKeywords: Clouds; Galaxies; Population statistics; Surveys; Cepheids; Data base; Fundamental modes; Light curves; Magellanic Clouds; Maximum values; Mean values; Metallicities; Metallicity; Micro-lensing; Non-adiabatic; Systematic studies; Variable stars; Stars Cepheids; Magellanic Clouds
dc.titleThe beat Cepheids in the Magellanic Clouds: an analysis from the EROS-2 database
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume495
dc.date.issued2009
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu3356449xPUB87
local.type.statusPublished Version
local.contributor.affiliationMarquette, J B, Universite Pierre & Marie Curie
local.contributor.affiliationBeaulieu, J.-P, Universite Pierre et Marie Curie (CRNS)
local.contributor.affiliationBuchler, J. R. , University of Florida
local.contributor.affiliationSzabo, R., Konkoly Observatory
local.contributor.affiliationTisserand, Patrick, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBelghith, S., Universite Pierre & Marie Curie
local.contributor.affiliationFouque, P, Observatoire Midi-Pyrenees
local.contributor.affiliationLesquoy, E., Universite Pierre & Marie Curie
local.contributor.affiliationMilsztajn, A, CEA-Saclay
local.contributor.affiliationSchwarzenberg-Czerny, A, Centrum Astronomiczne im. M. Kopernika
local.contributor.affiliationAfonso, C, Konkoly Observatory
local.contributor.affiliationAlbert, J.N., Universite de Paris-Sud
local.description.embargo2037-12-31
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage249
local.bibliographicCitation.lastpage256
local.identifier.doi10.1051/0004-6361:200810842
dc.date.updated2016-02-24T09:55:26Z
local.identifier.scopusID2-s2.0-60849098205
local.identifier.thomsonID000263550000023
CollectionsANU Research Publications

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