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Asteroseismology of GD358 with complex core carbon and oxygen profiles

Published online by Cambridge University Press:  27 October 2016

Agnès Bischoff-Kim  and
Judith L. Provencal
Agnès Bischoff-Kim
Affiliation:
Penn State Worthington Scranton, Dunmore, PA 18512, USA email: axk55@psu.edu
Judith L. Provencal
Affiliation:
Dept. of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA email: jlp@udel.edu
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Abstract

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GD 358 is the brightest (mv=13.7) and best studied helium atmosphere white dwarf pulsator. We present an analysis based on over 1000 hours of observations spanning 2007-2014 as well as archival data going back to 1982. From the complete data set, we identify a total of 27 independent frequencies and fit 14 of them as m=0 modes in our asteroseismic analysis. We add GD358 to a set of helium atmosphere white dwarfs fitted with similar models. With this consistent set, we can see a trend in the thickness of the pure helium layer that are quantitatively consistent with time-dependent diffusion calculations.

Keywords

ConvectionDense MatterDiffusionstars: AGB and post-AGBstars: evolutionstars: individual (GD358)stars: interiorsstars: oscillationsstars: variables: otherwhite dwarfs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 489 - 492
Copyright
Copyright © International Astronomical Union 2016 

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