Journal Article

SDSS J0349—0059 is a GW Virginis star

Patrick A. Woudt, Brian Warner and Ewald Zietsman

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 3, pages 2137-2141
Published in print November 2012 | ISSN: 0035-8711
Published online November 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21899.x
SDSS J0349—0059 is a GW Virginis star

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Abstract

High-speed photometric observations of the spectroscopically discovered PG 1159 star SDSS J034917.41−005917.9 in 2007 and 2009 reveal a suite of pulsation frequencies in the range of 1038–3323  μHz with amplitudes between 3.5 and 18.6 mmag. SDSS J034917.41−005917.9 is therefore a member of the GW Vir class of pulsating pre-white dwarfs. We have identified 10 independent pulsation frequencies that can be fitted by an asymptotic model with a constant period spacing of 23.61 ± 0.21 s, presumably associated with a sequence of ℓ = 1 modes. The highest amplitude peak in the suite of frequencies shows evidence for a triplet structure, with a frequency separation of 14.4  μHz. Five of the identified frequencies do not fit the ℓ = 1 sequence, but are, however, well modelled by an independent asymptotic sequence with a constant period spacing of 11.66 ± 0.13 s. It is unclear to which ℓ mode these frequencies belong.

Keywords: techniques: photometric; stars: individual: SDSS J034917.41−005919.2; stars: oscillations

Journal Article.  2440 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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