SIMBAD references

2014ApJ...794...39B - Astrophys. J., 794, 39 (2014/October-2)

Seven-period asteroseismic fit of the Kepler DBV.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: variables: general - white dwarfs

Simbad objects: 7

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