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Seven-period asteroseismic fit of the Kepler DBV
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Bischoff-Kim, Agnès, Østensen, Roy H., Hermes, J. J. and Provencal, Judith L. (2014) Seven-period asteroseismic fit of the Kepler DBV. The Astrophysical Journal, Volume 794 (Number 1). Article number 39. doi:10.1088/0004-637X/794/1/39 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.1088/0004-637X/794/1/39
Abstract
We present a new, better-constrained asteroseismic analysis of the helium-atmosphere (DB) white dwarf discovered in the field of view of the original Kepler mission. Observations obtained over the course of 2 yr yield at least seven independent modes, two more than were found in the discovery paper for the object. With several triplets and doublets, we are able to fix the ℓ and m identification of several modes before performing the fitting, greatly reducing the number of assumptions we must make about mode identification. We find a very thin helium layer for this relatively hot DB, which adds evidence to the hypothesis that helium diffuses outward during DB cooling. At least a few of the modes appear to be stable on evolutionary timescales and could allow us to obtain a measurement of the rate of cooling with monitoring of the star over the course of the next few years with ground-based follow-up.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||||
ISSN: | 0004-637X | ||||||||||
Official Date: | 10 October 2014 | ||||||||||
Dates: |
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Volume: | Volume 794 | ||||||||||
Number: | Number 1 | ||||||||||
Article Number: | Article number 39 | ||||||||||
DOI: | 10.1088/0004-637X/794/1/39 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Adapted As: |
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