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2017AJ....154..259S - Astron. J., 154, 259-259 (2017/December-4)

Empirical bolometric fluxes and angular diameters of 1.6 million Tycho-2 stars and radii of 350,000 stars with Gaia DR1 parallaxes.


Abstract (from CDS):

We present bolometric fluxes and angular diameters for over 1.6 million stars in the Tycho-2 catalog, determined using previously determined empirical color-temperature and color-flux relations. We vet these relations via full fits to the full broadband spectral energy distributions for a subset of benchmark stars and perform quality checks against the large set of stars for which spectroscopically determined parameters are available from LAMOST, RAVE, and/or APOGEE. We then estimate radii for the 355,502 Tycho-2 stars in our sample whose Gaia DR1 parallaxes are precise to 10 % . For these stars, we achieve effective temperature, bolometric flux, and angular diameter uncertainties of the order of 1%-2% and radius uncertainties of order 8%, and we explore the effect that imposing spectroscopic effective temperature priors has on these uncertainties. These stellar parameters are shown to be reliable for stars with Teff <= 7000 K. The over half a million bolometric fluxes and angular diameters presented here will serve as an immediate trove of empirical stellar radii with the Gaia second data release, at which point effective temperature uncertainties will dominate the radius uncertainties. Already, dwarf, subgiant, and giant populations are readily identifiable in our purely empirical luminosity-effective temperature (theoretical) Hertzsprung-Russell diagrams.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): catalogs - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/AJ/154/259): table2.dat table3.dat table6.dat>

Status in Simbad:  will not be processed

Simbad objects: 3

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