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Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars

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dc.contributor.author Marconi, M.
dc.contributor.author Minniti, D.
dc.date.accessioned 2018-08-21T14:18:57Z
dc.date.available 2018-08-21T14:18:57Z
dc.date.issued 2018
dc.identifier.citation Astrophysical Journal Letters, 853(2), art. no. L20. es_ES
dc.identifier.issn 2041-8205
dc.identifier.other DOI: 10.3847/2041-8213/aaa8e3
dc.identifier.uri http://repositorio.unab.cl/xmlui/handle/ria/6721
dc.description Indexación: Scopus. es_ES
dc.description.abstract We 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.uri http://iopscience.iop.org/article/10.3847/2041-8213/aaa8e3/meta
dc.language.iso en es_ES
dc.publisher Institute of Physics Publishing es_ES
dc.subject Galaxy: bulge es_ES
dc.subject Galaxy: evolution es_ES
dc.subject Stars: abundances es_ES
dc.title Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars es_ES
dc.type Article es_ES

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