A new pulsating white dwarf - GD 154

Details A new pulsating white dwarf - GD 154 A new pulsating white dwarf - GD 154

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..614r&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Mar. 1, 1978, p. 614-618.

Astronomy and Astrophysics

Astrophysics

37

Astronomical Photometry, Stellar Luminosity, Variable Stars, White Dwarf Stars, Ephemerides, Light Curve, Periodic Variations, Power Spectra

Scientific paper

Additional results are reported for a survey of luminosity variations in white dwarfs. GD 154, a DA white dwarf with B-V = +0.18, is found to vary at either of two dominant periods, 1186 or 780 s. For nine nights the 1186-s period dominated and the light curve was strictly periodic, so that an ephemeris could be constructed which predicted the time of arrival of pulse peaks to + or - 30 s. On a 10th night the 780-s period dominated. The variations are probably caused by nonradial g-mode pulsations, but the extreme length of the 1186-s pulsation period strongly suggests that the white dwarf is pulsating in a very high overtone (k of approximately 10-30). The change in the period on the last night is attributed to transfer of pulsation energy from the 1186-s pulsation mode to the 780-s pulsation mode.

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