Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 476, Issue 2, Pages 2556-2583Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty330
Keywords
stars: distances; stars: fundamental parameters; stars: statistics; Galaxy: stellar content
Categories
Funding
- Spanish MICINN [AyA2011-24052]
- Ministerio de Ciencia e Tecnologia (MCT)
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Financiadora de Estudos e Projetos (FINEP)
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for High-Performance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science
- Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrofisica de Canarias
- Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Lawrence Berkeley National Laboratory
- Leibniz-Institut fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA
- Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA
- Garching)
- Max-Planck-Institut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatory of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional/MCTI
- Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
- ESO Telescopes at the La Silla Paranal Observatory [188.B-3002]
- Leibniz Graduate School for Quantitative Spectroscopy at AIP
- Outgoing and Incoming Mobility Programme
- DFG [CH1188/2-1]
- ChETEC COST Action [CA16117]
- COST (European Cooperation in Science and Technology)
- Physics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE) by the US National Science Foundation [PHY 14-30152]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1430152] Funding Source: National Science Foundation
Ask authors/readers for more resources
Understanding the formation and evolution of our Galaxy requires accurate distances, ages, and chemistry for large populations of field stars. Here, we present several updates to our spectrophotometric distance code, which can now also be used to estimate ages, masses, and extinctions for individual stars. Given a set of measured spectrophotometric parameters, we calculate the posterior probability distribution over a given grid of stellar evolutionary models, using flexible Galactic stellar-population priors. The code (called StarHorse) can accommodate different observational data sets, prior options, partially missing data, and the inclusion of parallax information into the estimated probabilities. We validate the code using a variety of simulated stars as well as real stars with parameters determined from asteroseismology, eclipsing binaries, and isochrone fits to star clusters. Our main goal in this validation process is to test the applicability of the code to field stars with known Gaia-like parallaxes. The typical internal precisions (obtained from realistic simulations of an APOGEE+ Gaia-like sample) are similar or equal to 8 per cent in distance, similar or equal to 20 per cent in age, similar or equal to 6 per cent in mass, and similar or equal to 0.04 mag in A(V). The median external precision (derived from comparisons with earlier work for real stars) varies with the sample used, but lies in the range of similar or equal to[0, 2] per cent for distances, similar or equal to[12, 31] per cent for ages, similar or equal to[4, 12] per cent for masses, and similar or equal to 0.07 mag for A(V). We provide StarHorse distances and extinctions for the APOGEE DR14, RAVE DR5, GES DR3, and GALAH DR1 catalogues.
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