The SDSS-Gaia view of the color-magnitude relation for blue horizontal-branch stars
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2022
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We 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.
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BARBOSA, 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.