Extreme ultraviolet spectroscopy of G191-B2B - Direct observation of ionization edges

Details Extreme ultraviolet spectroscopy of G191-B2B - Direct observation of ionization edges Extreme ultraviolet spectroscopy of G191-B2B - Direct observation of ionization edges

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397l..51w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 397, no. 1, p. L51-L54.

Computer Science

Sound

24

Stellar Spectra, Ultraviolet Spectroscopy, White Dwarf Stars, Absorption Spectra, Opacity, Photoionization, Photosphere, Stellar Atmospheres, Stellar Spectrophotometry

Scientific paper

We present the first spectrum of the hot, DA white dwarf G191-B2B (wd 0501 + 527) between 200 and 330 A. The spectrum, which has about 2 A resolution, was obtained with a sounding rocket-borne, grazing incidence spectrograph. The spectrum shows no evidence of He II, the expected primary opacity source in this wavelength region. Three ionization edges and one absorption feature were observed and are suggestive of O III existing in the photosphere of G191-B2B. Also noted is a broad spectral depression that may result from Fe VI in the photosphere.

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