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Title: Seven-period asteroseismic fit of the Kepler DBV

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Penn State Worthington Scranton, Dunmore, PA 18512 (United States)
  2. Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee (Belgium)
  3. Department of Physics, The University of Warwick, Coventry CV4 7AL (United Kingdom)
  4. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States)
Publication Date:
OSTI Identifier:
22370476
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 794; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATMOSPHERES; COOLING; HELIUM; HYPOTHESIS; LAYERS; OSCILLATIONS; SPACE VEHICLES; TRIPLETS; WHITE DWARF STARS