Whole Earth Telescope Observations of Pulsating White Dwarf Stars

Details Whole Earth Telescope Observations of Pulsating White Dwarf Stars Whole Earth Telescope Observations of Pulsating White Dwarf Stars

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18111905c&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #119.05; Bulletin of the American Astronomical Society, Vol. 25, p.741

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results from recent observing runs with the Whole Earth Telescope (WET). Notably, in the Fourier transform (FT) of the DBV PG1115+158, we have tentatively identified peaks arranged in multiplets with common frequency splittings. The average period spacing between these multiplets is about 40 seconds, very similar to the value found in WET data of the DBV GD358. Theoretical models show l=1 modes with 40 s period spacing between modes of consecutive k for white dwarfs with masses near 0.6 M_sun. If the multiplets we have identified are l=1 modes, then the rotation rate of PG1115 is 0.45 d. Furthermore, the deviation of the period spacing between modes from the mean period spacing indicates that the surface He layer is thin, less than 10(-4) M_*.

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