The Polluting Body of the DAZ White Dwarf G238-44: FUSE and Keck HIRES Spectroscopy

Details The Polluting Body of the DAZ White Dwarf G238-44: FUSE and Keck HIRES Spectroscopy The Polluting Body of the DAZ White Dwarf G238-44: FUSE and Keck HIRES Spectroscopy

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21333302m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #333.02; Bulletin of the American Astronomical Society, Vol. 41, p.393

Astronomy and Astrophysics

Astronomy

Scientific paper

We report FUSE ultraviolet and Keck/HIRES optical spectra of G238-44, a metal-enhanced white dwarf. Abundance analysis of the 7 unique elements identified in our spectra; Ca, Mg, Si, C, N, O, and Fe; shows a roughly factor of 10 overabundance of Mg relative to Si when compared against the Sun or the Earth/Moon system. We speculate that one possible explanation for the relatively high magnesium abundance in the atmosphere of G238-44 is that the pollution arises from a large portion of the mantle of an extrasolar asteroid that followed an evolutionary path similar to that computed for Mercury's mantle by Fegley and Cameron (1987, EPS 82, L207).
This research was supported in part by NASA grants to UCLA.

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