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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: [email protected]
Judith L. Provencal
Affiliation:
Dept. of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA email: [email protected]
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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 

References

Althaus, L. G., Serenelli, A. M., Panei, J. A., et al. 2005, A&A, 435, 631 Google Scholar
Bergeron, P., Wesemael, F., Dufour, P., et al. 2011, ApJ, 737, 28 CrossRefGoogle Scholar
Bischoff-Kim, A. & Metcalfe, T. S. 2011, MNRAS, 414, 404 Google Scholar
Bischoff-Kim, A., Østensen, R. H., Hermes, J. J., & Provencal, J. L. 2014, ApJ, 794, 39 Google Scholar
Bischoff-Kim, A., Provencal, J. L. & the WET team, in preparationGoogle Scholar
Kepler, et al. 2003, A&A, 401, 639 Google Scholar
Koester, D., Provencal, J., & Gänsicke, B. T. 2015, in Astronomical Society of the Pacific Conference Series, Vol. 493, 19th European Workshop on White Dwarfs, ed. Dufour, P., Bergeron, P., & Fontaine, G., 77Google Scholar
Metcalfe, T. S. 2005, MNRAS, 363, L86 Google Scholar
Provencal, J. L., Montgomery, M. H., Kanaan, A., et al. 2009, ApJ, 693, 564 CrossRefGoogle Scholar
Salaris, M., Dominguez, I., Garcia-Berro, E., et al. 1997, ApJ, 486, 413 CrossRefGoogle Scholar
Winget, D. E., Robinson, E. L., Nather, R. D., & Fontaine, G. 1982, ApJ (Letters), 262, L11 Google Scholar
Winget, et al. 1994, ApJ, 430, 839 Google Scholar