Testing the white dwarf mass-radius relation and comparing optical and far-UV spectroscopic results with Gaia DR2, HST and FUSE
AffiliationUniv Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationS R G Joyce, M A Barstow, S L Casewell, M R Burleigh, J B Holberg, H E Bond; Testing the white dwarf mass–radius relation and comparing optical and far-UV spectroscopic results with Gaia DR2, HST, and FUSE, Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 2, 11 September 2018, Pages 1612–1626, https://doi.org/10.1093/mnras/sty1425
Rights© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
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AbstractObservational tests of the white dwarf mass-radius relationship have always been limited by the uncertainty in the available distance measurements. Most studies have focused on Balmer line spectroscopy because these spectra can be obtained from ground-based observatories, while the Lyman lines are only accessible to space-based UV telescopes. We present results using parallax data from Gaia DR2 combined with space-based spectroscopy from HST and FUSE covering the Balmer and Lyman lines. We find that our sample supports the theoretical relation, although there is at least one star which is shown to be inconsistent. Comparison of results between Balmer and Lyman line spectra shows they are in agreement when the latest broadening tables are used. We also assess the factors which contribute to the error in the mass-radius calculations and confirm the findings of other studies which show that the spread in results for targets where multiple spectra are available is larger than the statistical error. The uncertainty in the spectroscopically derived log g parameter is now the main source of error rather than the parallax. Finally, we present new results for the radius and spectroscopic mass of Sirius B which agree with the dynamical mass and mass-radius relation within 1 sigma.
VersionFinal published version
SponsorsScience and Technology Facilities Council (STFC, UK); Gaia post-launch support programme of the UK Space Agency; NSF [AST-1413537]