Vučković, M. and Riddle, R. (2006) Whole Earth Telescope Observations of the Pulsating Subdwarf B Star PG 0014+067. Astrophysical Journal, 646 (2). pp. 1230-1240. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110810-121833370
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PG 0014+067 is one of the most promising pulsating subdwarf B stars for seismic analysis, as it has a rich pulsation spectrum. The richness of its pulsations, however, poses a fundamental challenge to understanding the pulsations of these stars, as the mode density is too complex to be explained only with radial and nonradial low-degree (l < 3) p-modes without rotational splittings. One proposed solution, suggested by Brassard et al. in 2001 for the case of PG 0014+067 in particular, assigns some modes with high degree (l = 3). On the other hand, theoretical models of sdB stars suggest that they may retain rapidly rotating cores, and so the high mode density may result from the presence of a few rotationally split triplet (l = 1) and quintuplet (l = 2) modes, along with radial (l = 0) p-modes. To examine alternative theoretical models for these stars, we need better frequency resolution and denser longitude coverage. Therefore, we observed this star with the Whole Earth Telescope for two weeks in 2004 October. In this paper we report the results of Whole Earth Telescope observations of the pulsating subdwarf B star PG 0014+067. We find that the frequencies seen in PG 0014+067 do not appear to fit any theoretical model currently available; however, we find a simple empirical relation that is able to match all of the well-determined frequencies in this star.
|Additional Information:||© 2006 American Astronomical Society. Received 2006 February 22; accepted 2006 April 13. Financial support for this work came from the US National Science Foundation (NSF), through grant AST20205983 to Iowa State University. As of 2005 September 1, M. V. is a Ph.D. student of the Research Council of the Katholieke Universiteit Leuven under the doctoral scholarship OE/05/20. She acknowledges additional financial support from Katholieke Universiteit Leuven grant GOA/2003/04.M. V. would like to thank Elizabeth Potter and Chris Tourek for helping the Xcov24 headquarters and with the data reduction. Z. C. and M. P. acknowledge financial support from Hungarian OTKA T-038440 and T-046207. NSF grant AST 03-7480 to Missouri State University supported traveling costs and the camera used by M. D. R. S. J. O. T. is supported by the Deutsches Zentrum fr Luft- und Raumfahrt (DLR) through grant 50-OR-0202.|
|Subject Keywords:||stars: individual (PG 0014+067); stars: oscillations; subdwarfs|
|Official Citation:||Whole Earth Telescope Observations of the Pulsating Subdwarf B Star PG 0014+067 M. Vučković et al. 2006 ApJ 646 1230|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||10 Aug 2011 20:22|
|Last Modified:||26 Dec 2012 13:28|
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