Model atmosphere analysis of the DZ white dwarf K789 - 37

Details Model atmosphere analysis of the DZ white dwarf K789 - 37 Model atmosphere analysis of the DZ white dwarf K789 - 37

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...350..329k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 350, Feb. 10, 1990, p. 329-333.

Astronomy and Astrophysics

Astrophysics

7

Abundance, Atmospheric Models, Stellar Atmospheres, White Dwarf Stars, Atmospheric Temperature, Stellar Spectra, Trace Elements

Scientific paper

This paper presents new observations and an analysis using model atmosphere techniques of the recently discovered DZA white dwarf K789 - 37. The effective temperature derived is 9500 + or - 500 K. Abundances are determined for the elements hydrogen, magnesium, calcium, and iron, as well as upper limits for carbon and silicon. The abundances are very low compared to solar values and within the range typical for this spectral class. The implications of the results for the currently accepted explanation of trace elements in cool white dwarfs in terms of the diffusion/accretion scenario are discussed. It is concluded that the accreted matter cannot have had solar composition.

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