The External Pollution of GD 362: The Bulk Composition of an Extra-Solar Asteroid?

Details The External Pollution of GD 362: The Bulk Composition of an Extra-Solar Asteroid? The External Pollution of GD 362: The Bulk Composition of an Extra-Solar Asteroid?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911507m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #115.07; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Keck HIRES (Vogt et. al 1994) and NIRSPEC (McLean et. al 1998) spectroscopy of GD 362 reveals the greatest number of atomic and ionic species ever documented in a white dwarf. We determine abundances of H, He, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Sr, and upper limits on C and O in the star's photosphere. The discovery of helium requires substantial modification of previously accepted stellar parameters derived assuming a hydrogen-dominated atmosphere.
GD 362 has a dusty circumstellar disk. If the disk resulted from the tidal disruption of an asteroid, then our measured elemental abundances represent the first thorough study of the bulk composition of an extrasolar minor planet.

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