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Analysis of Long-Term Single-Site Observations of the Pulsating DB White Dwarf GD 3581

Published online by Cambridge University Press:  12 April 2016

P.A. Bradley
P.A. Bradley*
Affiliation:
X-2 MS B220, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, e-mail:pbradley@lanl.gov

Extract

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The pulsating DB white dwarf GD 358 was observed by the Whole Earth Telescope (WET) in 1990, 1994, and 2000. While these observing runs revealed a wealth of pulsation modes, they constitute only three “snapshots” of the behavior of this star. These “snapshots” show that GD 358 has a series of l = 1 modes present in the period range of 420 to 810 seconds, with numerous Fourier Transform peaks at the sums and differences of the l = 1 mode frequencies. In addition, the amplitudes of the l = 1 modes and the sum and difference frequency peaks (which I also call “combination peaks” in this paper) are different in each WET run. These data are not sufficient to determine the time scale of the amplitude changes and whether additional l = 1 modes might be present. For this, we need more frequent data sets, although not necessarily WET data.

Type
Part 2.5. Pulsations in Compact Objects
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 382 - 383
Copyright
Copyright © Astronomical Society of the Pacific 2002

Footnotes

1

These data were collected at McDonald Observatory, Fort Davis, Texas

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