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Search For Cool White Dwarf Pulsators

Published online by Cambridge University Press:  12 April 2016

Atsuko Nitta ,
A. Mukadam ,
D. E. Winget ,
A. Kanaan ,
S. J. Kleinman ,
S. O. Kepler  and
M. H. Montgomery
Atsuko Nitta
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712, U.S.A.
A. Mukadam
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712, U.S.A.
D. E. Winget
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712, U.S.A.
A. Kanaan
Affiliation:
Universidade Federal de Santa Catarina, Campus Universitario, Trindade, CEP 88040-900, Florianopolis, SC, Brazil
S. J. Kleinman
Affiliation:
Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, U.S.A.
S. O. Kepler
Affiliation:
Universidade Federal do Rio Grande do Sul, 91501-900 Porto Alegre, RS Brazil
M. H. Montgomery
Affiliation:
Institut für Astronomie, Universität Wien, Tuerkenschanzstrasse 17, A-1180 Wien, Austria

Abstract

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We are searching for pulsations in cool (< 6000 K) white dwarfs (WDs), hoping to apply asteroseismological techniques to improve our understanding of their structure and the physical processes inside them. This information is important as we use cool WDs to estimate the lower limit of the age of the Galactic disk. Within a spectroscopic and photometric survey of 110 cool WDs by Bergeron, Ruiz, & Legget, we find 28 candidates with appropriate effective temperatures, masses, and chemical compositions for possible pulsations in nonradial g modes with periods similar to those we observe in DAVs. So far, we have observed 4 candidates, but have found no evidence of large variation.

Type
Part 7. Pulsating White Dwarfs and Subdwarfs
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 525 - 526
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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