The SDSS-Gaia View of the Color-Magnitude Relation for Blue Horizontal-branch Stars

Author(s)

Barbosa, Fabricia O. ; Santucci, Rafael M. ; Rossi, Silvia ; Limberg, Guilherme ; Perez-Villegas, Angeles ; Perottoni, Helio D.

• Document type: Journal article
• Source: ASTROPHYSICAL JOURNAL; v. 940, n. 1, p. 9-pg., 2022-11-01.

Abstract

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 ( logg 0 and (u - r)(0) colors. (AU)

• FAPESP's process: 15/50374-0 - Mosaic: the multi-object spectrograph for the ESO Extremely Large Telescope
• Grantee: Silvia Cristina Fernandes Rossi
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 21/10429-0 - The chemodynamical structure of the ancient galactic halo
• Grantee: Guilherme Limberg
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 14/18100-4 - Stellar populations in the Milky Way: bulge, halo, disk and star forming regions; instrumentation for high resolution spectroscopy
• Grantee: Beatriz Leonor Silveira Barbuy
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 18/21250-9 - Identification of bright ultra-metal-poor stars from Multi-Band photometry and spectroscopic follow-up
• Grantee: Hélio Dotto Perottoni
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 22/04079-0 - Characterizing ultra-faint dwarf galaxies with S-PLUS survey
• Grantee: Hélio Dotto Perottoni
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor