SDSS J0349-0059 is a GW Virginis star

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 microHz 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 microHz. Five of the identified frequencies do not fit the l = 1 sequence, but are, however, well-modeled 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.

Accepted for publication in MNRAS; 5 pages, 6 figures and 4 tables

References in corpus (4)

• The Eighth Data Release of the Sloan Digital Sky Survey: First Data from SDSS-III
• Pulsating White Dwarf Stars and Precision Asteroseismology
• New nonadiabatic pulsation computations on full PG1159 evolutionary models: the theoretical GW Vir instability strip revisited
• Spectral analyses of eighteen hot H-deficient (pre-) white dwarfs from the Sloan Digital Sky Survey Data Release 4

Cited by in corpus (3)

• Pulsating white dwarfs: new insights
• Discovery of a new PG1159 (GW Vir) Pulsator
• Asteroseismology of the GW Virginis stars SDSS J0349-0059 and VV 47