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3D model atmospheres for extremely low-mass white dwarfs
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Tremblay, Pier-Emmanuel, Gianninas, A., Kilic, M., Ludwig, H.-G., Steffen, M., Freytag, B. and Hermes, J. J. (2015) 3D model atmospheres for extremely low-mass white dwarfs. The Astrophysical Journal, 809 (2). 148. doi:10.1088/0004-637X/809/2/148 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/809/2/148
Abstract
We present an extended grid of mean three-dimensional (3D) spectra for low-mass, pure-hydrogen atmosphere DA white dwarfs (WDs). We use CO5BOLD radiation-hydrodynamics 3D simulations covering Teff = 6000–11,500 K and log g = 5–6.5 (g in cm s−2) to derive analytical functions to convert spectroscopically determined 1D temperatures and surface gravities to 3D atmospheric parameters. Along with the previously published 3D models, the 1D to 3D corrections are now available for essentially all known convective DA WDs (i.e., log g = 5–9). For low-mass WDs, the correction in temperature is relatively small (a few percent at the most), but the surface gravities measured from the 3D models are lower by as much as 0.35 dex. We revisit the spectroscopic analysis of the extremely low-mass (ELM) WDs, and demonstrate that the 3D models largely resolve the discrepancies seen in the radius and mass measurements for relatively cool ELM WDs in eclipsing double WD and WD + millisecond pulsar binary systems. We also use the 3D corrections to revise the boundaries of the ZZ Ceti instability strip, including the recently found ELM pulsators.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Convection (Astrophysics), White dwarf stars | ||||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||
ISSN: | 0004-637X | ||||||||
Official Date: | 19 August 2015 | ||||||||
Dates: |
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Volume: | 809 | ||||||||
Number: | 2 | ||||||||
Article Number: | 148 | ||||||||
DOI: | 10.1088/0004-637X/809/2/148 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 27 October 2016 | ||||||||
Date of first compliant Open Access: | 27 October 2016 | ||||||||
Funder: | Hubble Space Telescope (Spacecraft) (HST), United States. National Aeronautics and Space Administration (NASA), National Science Foundation (U.S.) (NSF), Sonderforschungsbereich 881 -- "The Milky Way System", Deutsche Forschungsgemeinschaft (DFG), Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC) | ||||||||
Grant number: | HF-51329.01 (HST), NAS 5-26555, HST-GO-13319.01 (NASA) AST-1312678, NNX14AF65G (NSF & NASA), FP/2007–2013 (FP7), Grant no. 320964 (ERC) |
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