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Paper: Detection of Arsenic in the Atmospheres of Dying Stars
Volume: 493, 19th European Workshop on White Dwarfs
Page: 3
Authors: Chayer, P.; Dupuis, J.; Kruk, J. W.
Abstract: We report the detection of As V resonance lines observed in the Far Ultraviolet Spectroscopic Explorer (FUSE) spectra of three hot DA white dwarfs: G191–B2B, WD 0621–376, and WD 2211–495. The stars have effective temperatures ranging from 60,000 K to 64,000 K and are among the most metal-rich white dwarfs known. We measured the arsenic abundances not only in these stars, but also in three DO stars in which As has been detected before: HD 149499 B, HZ 21, and RE 0503–289. The arsenic abundances observed in the DA stars are very similar. This suggests that radiative levitation may be the mechanism that supports arsenic. The arsenic abundance in HZ 21 is significantly lower than that observed in HD 149499 B, even though the stars have similar atmospheric parameters. An additional mechanism may be at play in the atmospheres of these two DO stars.
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