Hubble Space Telescope observations of cool white dwarf stars: Detection of new species of heavy elements

Details Hubble Space Telescope observations of cool white dwarf stars: Detection of new species of heavy elements Hubble Space Telescope observations of cool white dwarf stars: Detection of new species of heavy elements

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1231s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 3, p. 1231-1238

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7

Absorption Spectra, Abundance, Line Spectra, Stellar Composition, Ultraviolet Spectra, White Dwarf Stars, Hubble Space Telescope, Iron, Magnesium, Silicon, Sodium, Spectrum Analysis

Scientific paper

Observations of cool white dwarf stars with the Hubble Space Telescope (HST) has uncovered a number of spectral features from previouslly unobserved species. In this paper we present the data on four cool white dwarfs. We present identifications, equivalent width measurements, and brief summaries of the significance of our findings. The four stars observed are GD 40 (DBZ3, G 74-7 (DAZ), L 745-46A (DZ), and LDS 749B (DBA). Many additional species of heavey elements were detected in GD 40 and G 74-7. In L 745-46A, while the detections are limited to Fe 1, Fe II, and Mg II, the quality of the Mg II h and K line profiles should permit a test of the line broadening theories, which are so crucial to abundance determinations. The clear detection of Mg II h and k in LDS 749 B should, once an abundance determination is made, provide a clear test of the hypothesis that the DBA stars are the result of accretion from the interstellar medium. This star contains no other clear features other than a tantalizing hint of C II 1335 with a P Cygni profile, and some expected He 1 lines.

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