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Isochrone fitting in the Gaia era
Open accessAbstract
Context. Currently, galactic exploration is being revolutionized by a flow of new data: Gaia provides measurements of stellar distances and kinematics; growing numbers of spectroscopic surveys provide values of stellar atmospheric parameters and abundances of elements; and Kepler and K2 missions provide asteroseismic information for an increasing number of stars. Aims. In this work, we aim to determine stellar distances and ages using Gaia and spectrophotometric data in a consistent way. We estimate precisions of age and distance determinations with Gaia end-of-mission (EoM) and Tycho-Gaia astrometric solution (TGAS) parallax precisions. Methods. To this end, we incorporated parallax and extinction data into the isochrone fitting method used in the Unified tool to estimate Distances, Ages, and Masses (UniDAM). We prepared datasets that allowed us to study the improvement of distance and age estimates with the inclusion of TGAS and Gaia EoM parallax precisions in isochrone fitting. Results. Using TGAS parallaxes in isochrone fitting, we are able to reduce distance and age estimate uncertainties for TGAS stars for distances up to 1 kpc by more than one third compared to results based only on spectrophotometric data. With Gaia EoM parallaxes in isochrone fitting, we will be able to further decrease our distance uncertainties by about a factor of 20 and age uncertainties by a factor of 2 for stars up to 10 kpc away from the Sun. Conclusions. We demonstrate that we will be able to improve our distance estimates for about one third of stars in spectroscopic surveys and to decrease log(age) uncertainties by about a factor of two for over 80% of stars as compared to the uncertainties obtained without parallax priors using Gaia EoM parallaxes consistently with spectrophotometry in isochrone fitting.
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Metadata
- Authors
- Mints, A., & Hekker, S.
- Affiliations
- Aarhus University (DK)
- Venue
- Astronomy & Astrophysics
- Publisher
- EDP Sciences
- Published
- 2018-10
- Volume
- 618
- Pages
- A54
- ISSN
- 0004-6361 (ISSN-L)
- 1432-0746
- OpenAlex
- W2796885520
- Cited by
- 31
- References
- 1
- Citations by year
- 2026: 4 · 2025: 3 · 2024: 3 · 2023: 3 · 2022: 4 · 2020: 6 · 2019: 4 · 2018: 4
- FWCI
- 1.88
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Astronomy and Astrophysics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (FP7/2007-2013, 0908326)
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Alfred P. Sloan Foundation
- W. M. Keck Foundation
- Yale University
- Vanderbilt University
- Princeton University
- Ohio State University
- California Institute of Technology
- Harvard University
- University of Washington
- Johns Hopkins University
- University of Arizona
- Carnegie Mellon University
- University of Portsmouth
- New Mexico State University
- York University
- Australian National University
- Macquarie University
- Deutsche Forschungsgemeinschaft (SPP 1177, FP7/2007–2013, SFB881)
- Agence Nationale de la Recherche
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (FP7/2007-2013)
- Chinese Academy of Sciences (FP7/2007-2013)
- Javna Agencija za Raziskovalno Dejavnost RS
- Istituto Nazionale di Astrofisica
- National Development and Reform Commission
- Office of Science
- Jet Propulsion Laboratory
- College of Engineering, Michigan State University
- University of California, Los Angeles
- Natural Sciences and Engineering Research Council of Canada (FP7/2007-2013)
- Science and Technology Facilities Council (FP7/2007-2013)
- Australian Research Council
- Leibniz-Gemeinschaft
- Australian Astronomical Optics-Macquarie
- National Astronomical Observatories, Chinese Academy of Sciences
- Brookhaven National Laboratory
- Lawrence Berkeley National Laboratory
- FP7 Ideas: European Research Council (240271, 338251)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astronomical Observations and Instrumentation
- Keywords
- isochrone fitting, stellar distances, stellar ages, Tycho-Gaia Astrometric Solution, spectrophotometric distances, extinction, age uncertainty, distance uncertainty
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