The multi-periodic pulsating PG 1159 white dwarf PG 0122+200.

Details The multi-periodic pulsating PG 1159 white dwarf PG 0122+200. The multi-periodic pulsating PG 1159 white dwarf PG 0122+200.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...299..707v&link_type=abstract

Astronomy and Astrophysics, v.299, p.707

Astronomy and Astrophysics

Astrophysics

18

White Dwarfs, Stars: Pg 1159, Stars: Oscillations

Scientific paper

PG 0122+200 is a hot pulsating PG 1159 [GW Virginis] star. This paper describes the results of two, bi-site, time-series photometric observational campaigns. The observed complex light curve is interpreted as resulting from a mixture of non radial g-mode pulsations. There appear to be at least ten independent frequencies in the power spectrum. The pulsation periods fall into four groups and are confined to a rather narrow interval between 336 and 470 seconds. The frequency resolution achieved (=~1.1μHz) reveals a fine structure which is interpreted as rotational splitting of l=1 modes. This splitting is consistent with a rotational period of 1.8 days for the star. We suspect that the observed modes are trapped modes separated by 3 or 4 undetected normal modes. Average period spacings of 16.70s or 16.16s are consistent with the data. However, a luminosity estimate and an irrefutable period spacing are necessary to determine PG 0122+200's mass.

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