Carbon Deficiency in Externally-Polluted White Dwarfs: Evidence for Accretion of Asteroids

Details Carbon Deficiency in Externally-Polluted White Dwarfs: Evidence for Accretion of Asteroids Carbon Deficiency in Externally-Polluted White Dwarfs: Evidence for Accretion of Asteroids

2006-09-01

arxiv.org/abs/astro-ph/0609045v1

Astrophys.J.653:613-620,2006

Astronomy and Astrophysics

Astrophysics

23 pages, 6 figures, accepted for ApJ

Scientific paper

10.1086/508738

Existing determinations show that n(C)/n(Fe) is more than a factor of 10
below solar in the atmospheres of three white dwarfs that appear to be
externally-polluted. These results are not easily explained if the stars have
accreted interstellar matter, and we re-interpret these measurements as
evidence that these stars have accreted asteroids of a chrondritic composition.

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