The detection of photospheric X-ray pulsations from PG 1159-035 with EXOSAT

Details The detection of photospheric X-ray pulsations from PG 1159-035 with EXOSAT The detection of photospheric X-ray pulsations from PG 1159-035 with EXOSAT

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306l..25b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 306, July 1, 1986, p. L25-L28.

Astronomy and Astrophysics

Astrophysics

16

Exosat Satellite, Photosphere, Stellar Oscillations, X Ray Sources, Absorption Spectra, Degeneration, Helium, Stellar Evolution, White Dwarf Stars

Scientific paper

The detection of soft X-ray pulsations from the hot, helium-rich, degenerate object, PG 1159-035 is reported. These observations, obtained with the Low Energy experiment on EXOSAT, show the presence of large-amplitude soft X-ray (44-150 A) pulsations analogous to several of the low-amplitude, nonradial, g-mode pulsations which are observed in the optical. These soft X-ray pulsations, with periods of 516 s, 524 s, and 539 s, arise from the photosphere of PG 1159-035 and constitute the first observations of stellar atmospheric pulsational phenomena in the X-ray band.

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