Helium enhancement among horizontal-branch stars and the near-UV color-magnitude diagrams

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dc.catalogadoryvc
dc.contributor.authorValcarce, Aldo A. R.
dc.contributor.authorCatelan, Márcio
dc.contributor.authorAlonso-García, Javier
dc.contributor.authorContreras Ramos, Rodrigo
dc.contributor.authorAlves, Sanzia
dc.date.accessioned2024-02-28T13:37:39Z
dc.date.available2024-02-28T13:37:39Z
dc.date.issued2015
dc.description.abstractThe distribution of horizontal branch stars in globular cluster color-magnitude diagrams is a sensitive probe of their original helium abundances. In this sense, they have been extensively used recently as indicators of possible variations in the helium content Y among the different populations of stars within individual globular clusters. However, recent analyses based on visual and near-ultraviolet color-magnitude diagrams have provided conflicting results. In order to clarify the situation, in this presentation we discuss the optimum ranges of applicability of this “HB Y test” in different filter systems, in terms of the temperature range covered by the horizontal branch stars. In particular, we discuss the case of M3 (NGC 5272), based on multi-band photometry (HST, Strömgren, Johnson), thus setting new and tight constraints on the internal range in Y within this cluster. We also provide an application of this "HB Y test" to other selected clusters....
dc.fuente.origenORCID
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/81407
dc.information.autorucInstituto de Astrofísica ; Catelan, Márcio ; 0000-0001-6003-8877 ; 1001556
dc.language.isoen
dc.nota.accesocontenido parcial
dc.rightsacceso restringido
dc.titleHelium enhancement among horizontal-branch stars and the near-UV color-magnitude diagrams
dc.typecomunicación de congreso
sipa.codpersvinculados1001556
sipa.trazabilidadORCID;2024-01-22
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