The SDSS-Gaia view of the color-magnitude relation for blue horizontal-branch stars

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dc.creatorBarbosa, Fabricia Oliveira
dc.creatorSantucci, Rafael Miloni
dc.creatorRossi, Silvia Cristina Fernandes
dc.creatorLimberg, Guilherme
dc.creatorPerez Villegas, Maria de los Angeles
dc.creatorPerottoni, Hélio Dotto
dc.date.accessioned2023-05-15T13:14:43Z
dc.date.available2023-05-15T13:14:43Z
dc.date.issued2022
dc.description.abstractWe present an updated sample of blue horizontal-branch (BHB) stars selected from the photometric and spectroscopic data from Sloan Digital Sky Survey and its associated project Sloan Extension for Galactic Understanding and Exploration (SEGUE). With these data, we selected candidates for A-type stars in the color– color space and then a mixture modeling technique was implemented in order to distinguish between BHB and main-sequence/blue-straggler stars based on their surface gravity values (log g) estimated by the SEGUE Stellar Parameter Pipeline. Our robust approach allows us to attribute individual probabilities of each star truly being in the BHB stage. Hence, our method is advantageous in comparison to previous SEGUE BHB selections that adopted simple log g cuts. We also revisit the color–magnitude relation for these stars and propose two calibrations, based on updated distances for Galactic globular clusters, to estimate absolute magnitudes with (g − r)0 and (u − r)0 colors.pt_BR
dc.identifier.citationBARBOSA, Fabrícia O.; SANTUCCI, Rafael M.; ROSSI, Silvia; LIMBERG, Guilherme; PÉREZ-VILLEGAS, Angeles; PEROTTONI, Hélio D. The SDSS-Gaia view of the color-magnitude relation for blue horizontal-branch stars. The Astrophysical Journal, Bristol, v. 940, n. 1, e30, 2022. DOI: 10.3847/1538-4357/ac983f. Disponível em: https://iopscience.iop.org/article/10.3847/1538-4357/ac983f. Acesso em: 11 maio 2023.pt_BR
dc.identifier.doi10.3847/1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttp://repositorio.bc.ufg.br/handle/ri/22529
dc.language.isoengpt_BR
dc.publisher.countryGra-bretanhapt_BR
dc.publisher.departmentInstituto de Estudos Socioambientais - IESA (RG)pt_BR
dc.rightsAcesso Abertopt_BR
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleThe SDSS-Gaia view of the color-magnitude relation for blue horizontal-branch starspt_BR
dc.typeArtigopt_BR

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