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| Paper: |
On the Origin of Hydrogen in DB White Dwarfs |
| Volume: |
493, 19th European Workshop on White Dwarfs |
| Page: |
33 |
| Authors: |
Bergeron, P.; Rolland, B.; Limoges, M.-M.; Giammichele, N.; Séguin-Charbonneau, L.; Green, E. M. |
| Abstract: |
We report new spectroscopic observations of DB white dwarfs near the
region of Hα aimed at better constraining the hydrogen abundance
in the photosphere of these stars. These spectroscopic data are
analyzed with model atmosphere techniques and combined with our
previously published results in order to provide an improved picture
of the hydrogen abundances in DBA stars — or upper limits in DB's — as
a function of effective temperature. The origin of hydrogen in DB
white dwarfs is discussed in terms of the two most likely scenarios, a
residual origin from convective mixing or accretion from the
interstellar medium. |
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