Seven-period asteroseismic fit of the Kepler DBV

Agnes Kim, Roy H. Østensen, J. J. Hermes, Judith L. Provencal

Research output: Contribution to journalArticle

19 Citations (Scopus)

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.

Original languageEnglish (US)
Article number39
JournalAstrophysical Journal
Volume794
Issue number1
DOIs
StatePublished - Oct 10 2014

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helium
cooling
Kepler mission
field of view
fixing
timescale
atmosphere
monitoring
atmospheres
stars
rate
analysis

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kim, A., Østensen, R. H., Hermes, J. J., & Provencal, J. L. (2014). Seven-period asteroseismic fit of the Kepler DBV. Astrophysical Journal, 794(1), [39]. https://doi.org/10.1088/0004-637X/794/1/39
Kim, Agnes ; Østensen, Roy H. ; Hermes, J. J. ; Provencal, Judith L. / Seven-period asteroseismic fit of the Kepler DBV. In: Astrophysical Journal. 2014 ; Vol. 794, No. 1.
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Seven-period asteroseismic fit of the Kepler DBV. / Kim, Agnes; Østensen, Roy H.; Hermes, J. J.; Provencal, Judith L.

In: Astrophysical Journal, Vol. 794, No. 1, 39, 10.10.2014.

Research output: Contribution to journalArticle

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