Hubble space telescope ultraviolet spectroscopy of two hot white dwarfs

J. B. Holberg, M. A. Barstow, T. Lanz, I. Hubeny

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

We have obtained Hubble Space Telescope high-dispersion spectroscopy of two hot white dwarfs using the Goddard High-Resolution Spectrograph. The stars were selected on the basis of EUV flux as examples of H-rich DA stars containing high and low levels of short-wavelength opacity. The high-opacity star, REJ 1614-085, possesses strong features due to C IV, Si IV, and N V. Carbon and silicon in this star are underabundant with respect to the predictions of radiative levitation; nitrogen, however, is superabundant. This is in sharp contrast to the apparently similar DA star GD 394, where silicon is in extreme overabundance. The low-opacity star PG 1057+719, as expected, shows no clear evidence of these or any other heavy ions. We find evidence of weak blueshifted components in the REJ 1614-085 C IV and Si IV lines, which may indicate the star is experiencing ongoing mass loss.

Original languageEnglish (US)
Pages (from-to)871-878
Number of pages8
JournalAstrophysical Journal
Volume484
Issue number2
DOIs
StatePublished - Jan 1 1997

Keywords

  • Stars: abundances
  • Ultraviolet: stars
  • White dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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