Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..281s&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 281-284 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
7
Carbon, Chemical Composition, Oxygen, Silicon, Stellar Atmospheres, Stellar Spectra, White Dwarf Stars, Atmospheric Composition, Cameras, Iue, Metals, Short Wave Radiation, Stellar Temperature
Scientific paper
An IUE spectrum of the metal-rich DB white dwarf star GD 40 shows no unequivocal spectra features in the range of the short wavelength prime camera (1200-2000A). This wavelength region contains resonance lines of many common elements: H I, C I, CII, Si II, and O I. Upper limits to the abundances of H, C, Si, and O are derived from model atmosphere calculations. These limits, combined with the detection of Ca II, Mg II, and Fe II, conflict with the predictions of diffusion theories, which were widely invoked to explain the presence of metals in the spectra of the He-rich white dwarf stars. The upper limit to the C abundance indicates that the C abundances in He-rich white dwarfs peak at a temperature of about 12,000 K. Comments are given about how future missions can contribute to further understanding of the chemical compositions of white dwarf stars.
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