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Fundamental parameter accuracy of DA and DB white dwarfs in Gaia Data Release 2
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Tremblay, Pier-Emmanuel, Cukanovaite, Elena, Gentile Fusillo, N. P., Cunningham, T. J. and Hollands, Mark A. (2019) Fundamental parameter accuracy of DA and DB white dwarfs in Gaia Data Release 2. Monthly Notices of the Royal Astronomical Society, 482 (4). pp. 5222-5232. doi:10.1093/mnras/sty3067
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Official URL: https://doi.org/10.1093/mnras/sty3067
Abstract
We report on a comparison of spectroscopic analyses for hydrogen (DA) and helium atmosphere (DB) white dwarfs with Gaia Data Release 2 (DR2) parallaxes and photometry. We assume a reddening law and a mass–radius relation to connect the effective temperatures (Teff) and surface gravities (log g) to masses and radii. This allows the comparison of two largely independent sets of fundamental parameters for 7039 DA and 521 DB stars with high-quality observations. This subset of the Gaia white dwarf sample is large enough to detect systematic trends in the derived parameters. We find that spectroscopic and photometric parameters generally agree within uncertainties when the expectation of a single star is verified. Gaia allows the identification of a small systematic offset in the temperature scale between the two techniques, as well as confirming a small residual high-mass bump in the DA mass distribution around 11 000–13 000 K. This assessment of the accuracy of white dwarf fundamental parameters derived from Gaia is a first step in understanding systematic effects in related astrophysical applications such as the derivation of the local stellar formation history, initial-to-final mass relation, and statistics of evolved planetary systems.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science > Physics | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Planetary systems | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press (OUP) | |||||||||
| ISSN: | 1365-2966 | |||||||||
| Official Date: | 1 February 2019 | |||||||||
| Dates: |
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| Date of first compliant deposit: | 18 January 2019 | |||||||||
| Volume: | 482 | |||||||||
| Number: | 4 | |||||||||
| Page Range: | pp. 5222-5232 | |||||||||
| DOI: | 10.1093/mnras/sty3067 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record P-E Tremblay, E Cukanovaite, N P Gentile Fusillo, T Cunningham, M A Hollands; Fundamental parameter accuracy of DA and DB white dwarfs in Gaia Data Release 2, Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, 1 February 2019, Pages 5222–5232, is available online at: https://doi.org/10.1093/mnras/sty3067 | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| RIOXX Funder/Project Grant: |
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