VizieR Online Data Catalog: Age of the Galactic stellar halo from Gaia WDs (Kilic+, 2019)
Abstract
We queried the Gaia data base for objects with plx>=5σplx significant parallaxes, and followed the recommendations outlined in Lindegren et al. (2018A&A...616A...2L, Cat. I/345) to remove non-Gaussian outliers in colour and absolute magnitude. We employed the astrometric and photometric quality cuts outlined in appendix C of Lindegren et al. (2018A&A...616A...2L, Cat. I/345). We used a simple cut in (GBP-GRP, MG) space keeping only those sources fainter than the line joining (-1,5) and (5,25) to identify the clearly subluminous stellar objects relative to the main sequence. The query returned 156044 sources. We take a conservative approach, and select only those objects with velocities that are more than 5σ away from this boundary as members of the Galactic halo. There are 142 white dwarfs that are clearly not compatible with a disc origin. As expected for a halo population, the majority of these velocity outliers lag behind the disc with V~-200km/s. Table 1 presents the Gaia Source identifications, spectral types, positions, parallaxes, proper motions, photometry, and UVW space velocities for each target. Table 2 presents the preferred composition, best-fitting effective temperature, mass, surface gravity, and the cooling age of each white dwarf.
(2 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- June 2022
- Bibcode:
- 2022yCat..74820965K
- Keywords:
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- Stars: white dwarf;
- Stellar distribution;
- Velocity dispersion;
- Photometry