The Pulsating Pre-White Dwarf Star PG 0122+200

Details The Pulsating Pre-White Dwarf Star PG 0122+200 The Pulsating Pre-White Dwarf Star PG 0122+200

1996-03-06

arxiv.org/abs/astro-ph/9603025v1

Astronomy and Astrophysics

Astrophysics

18 pages (latex, AASTEX) plus 6 PostScript figures, accepted 7 February 1996 by The Astrophysical Journal

Scientific paper

10.1086/177614

We present an analysis of single-site time-series photometry of the pulsating pre-white dwarf PG 0122+200. We show the pulsations are consistent with a pattern of modes equally spaced in period; both the observed period range and spacing confirm that PG 0122 is a g-mode pulsator. PG 0122 shows a pattern similar to that seen in multi-site observations of PG 2131+066 and PG 1159-035. The measured period spacing, combined with the spectroscopic temperature, constrain the stellar mass much more precisely than the published measurement of its surface gravity. Based on stellar models, the mass of PG 0122 falls in the range 0.66-0.72 Msun. Fine structure in the power spectrum indicates that PG 0122 rotates once every 1.6 days. Future multi--site observation (e.g., using the Whole Earth Telescope) should increase the precision of these results and reveal detailed information on the internal structure of this variable pre-white dwarf star.

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