C. Genest-Beaulieu, P. Bergeron
Published 2016-10-27Version 1
The hydrogen abundances in DBA white dwarfs determined from optical or UV spectra have been reported to differ significantly in some studies. We revisit this problem using our own model atmospheres and synthetic spectra, and present a theoretical investigation of the Lyman-$\alpha$ line profile as a function of effective temperature and hydrogen abundance. We identify one possible solution to this discrepancy and show considerable improvement from a detailed analysis of optical and UV spectra of DBA stars.
Comments: 4 pages, 4 figures, to be published in the proceedings of the 20th European Workshop on White Dwarfs held July 25-29th, 2016 at the University of Warwick, United Kingdom
The origin of elements: the need for UV spectra
A Convective Dredge-Up Model as the Origin of Hydrogen in DBA White Dwarfs
Radial pulsation as a function of hydrogen abundance
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