SDSS J0349-0059 is a GW Virginis star

TL;DR

This study presents detailed pulsation analysis of the GW Vir star SDSS J0349-0059, revealing multiple frequencies and mode structures, confirming its classification as a pulsating pre-white dwarf, and providing insights into its internal structure.

Contribution

The paper identifies and models multiple pulsation frequencies in SDSS J0349-0059, including asymptotic sequences and mode structures, advancing understanding of GW Vir star pulsations.

Findings

10 independent pulsation frequencies identified

A period spacing of 23.61 seconds for l=1 modes

Evidence of a triplet structure with 14.4 microHz separation

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.