PERIOD CHANGE SIMILARITIES AMONG THE RR LYRAE VARIABLES IN OOSTERHOFF I AND OOSTERHOFF II GLOBULAR SYSTEMS

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dc.contributor.authorKunder, Andrea
dc.contributor.authorWalker, Alistair
dc.contributor.authorStetson, Peter B.
dc.contributor.authorBono, Giuseppe
dc.contributor.authorNemec, James M.
dc.contributor.authorde Propris, Roberto
dc.contributor.authorMonelli, Matteo
dc.contributor.authorCassisi, Santi
dc.contributor.authorAndreuzzi, Gloria
dc.contributor.authorDall'Ora, Massimo
dc.contributor.authorDi Cecco, Alessandra
dc.contributor.authorZoccali, Manuela
dc.date.accessioned2025-01-21T00:03:57Z
dc.date.available2025-01-21T00:03:57Z
dc.date.issued2011
dc.description.abstractWe present period change rates (dP/dt) for 42 RR Lyrae variables in the globular cluster IC 4499. Despite clear evidence of these period increases or decreases, the observed period change rates are an order of magnitude larger than predicted from theoretical models of this cluster. We find that there is a preference for increasing periods, a phenomenon observed in most RR Lyrae stars in Milky Way globular clusters. The period change rates as a function of position in the period-amplitude plane are used to examine possible evolutionary effects in OoI clusters, OoII clusters, field RR Lyrae stars, and the mixed-population cluster. Centauri. It is found that there is no correlation between the period change rate and the typical definition of Oosterhoff groups. If the RR Lyrae period changes correspond with evolutionary effects, this would be in contrast to the hypothesis that RR Lyrae variables in OoII systems are evolved horizontal-branch stars that spent their zero-age horizontal-branch phase on the blue side of the instability strip. This may suggest that age may not be the primary explanation for the Oosterhoff types.
dc.fuente.origenWOS
dc.identifier.doi10.1088/0004-6256/141/1/15
dc.identifier.eissn1538-3881
dc.identifier.issn0004-6256
dc.identifier.urihttps://doi.org/10.1088/0004-6256/141/1/15
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95486
dc.identifier.wosidWOS:000285291100015
dc.issue.numero1
dc.language.isoen
dc.revistaAstronomical journal
dc.rightsacceso restringido
dc.subjectGalaxy: center
dc.subjectstars: abundances
dc.subjectstars: distances
dc.subjectstars: Population II
dc.subjectsurveys
dc.titlePERIOD CHANGE SIMILARITIES AMONG THE RR LYRAE VARIABLES IN OOSTERHOFF I AND OOSTERHOFF II GLOBULAR SYSTEMS
dc.typeartículo
dc.volumen141
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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