التفاصيل البيبلوغرافية
| العنوان: |
The SDSS-Gaia View of the Colorâ€"Magnitude Relation for Blue Horizontal-branch Stars. |
| المؤلفون: |
Barbosa, FabrĂ-cia O., Santucci, Rafael M., Rossi, Silvia, Limberg, Guilherme, PĂ©rez-Villegas, Angeles, Perottoni, HĂ©lio D. |
| المصدر: |
Astrophysical Journal; 11/20/2022, Vol. 940 Issue 1, p1-9, 9p |
| مصطلحات موضوعية: |
EARLY stars, OPEN clusters of stars, STELLAR magnitudes, ASTRONOMICAL surveys, GLOBULAR clusters, STELLAR atmospheres |
| الشركة/الكيان: |
SLOAN Digital Sky Survey |
| مستخلص: |
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 colorâ€"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 colorâ€"magnitude relation for these stars and propose two calibrations, based on updated distances for Galactic globular clusters, to estimate absolute magnitudes with (g â' r)0 and (u â' r)0 colors. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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