Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars

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dc.contributor.authorMarconi, M.
dc.contributor.authorMinniti, D.
dc.date.accessioned2018-08-21T14:18:57Z
dc.date.available2018-08-21T14:18:57Z
dc.date.issued2018
dc.descriptionIndexación: Scopus.es_ES
dc.description.abstractWe report the first estimate of the He abundance of the population of RR Lyrae stars in the Galactic bulge. This is done by comparing the recent observational data with the latest models. We use the large samples of ab-type RR Lyrae stars found by OGLE IV in the inner bulge and by the VVV survey in the outer bulge. We present the result from the new models computed by Marconi et al., showing that the minimum period for fundamental RR Lyrae pulsators depends on the He content. By comparing these models with the observations in a period versus effective temperature plane, we find that the bulk of the bulge ab-type RR Lyrae are consistent with primordial He abundance Y = 0.245, ruling out a significant He-enriched population. This work demonstrates that the He content of the bulge RR Lyrae is different from that of the bulk of the bulge population as traced by the red clump giants that appear to be significantly more He-rich.es_ES
dc.description.urihttp://iopscience.iop.org/article/10.3847/2041-8213/aaa8e3/meta
dc.identifier.citationAstrophysical Journal Letters, 853(2), art. no. L20.es_ES
dc.identifier.issn2041-8205
dc.identifier.otherDOI: 10.3847/2041-8213/aaa8e3
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/6721
dc.language.isoenes_ES
dc.publisherInstitute of Physics Publishinges_ES
dc.subjectGalaxy: bulgees_ES
dc.subjectGalaxy: evolutiones_ES
dc.subjectStars: abundanceses_ES
dc.titleGauging the Helium Abundance of the Galactic Bulge RR Lyrae Starses_ES
dc.typeArtículoes_ES
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