Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...432.1025k&link_type=abstract
Astronomy and Astrophysics, Volume 432, Issue 3, March IV 2005, pp.1025-1032
Astronomy and Astrophysics
Astrophysics
61
Stars: White Dwarfs, Stars: Atmospheres, Stars:, Abundances
Scientific paper
We search for faint Ca II lines in the spectra of about 800 apparently single white dwarfs observed at high resolution for the SPY (ESO Supernova Progenitor Survey) survey. Photospheric Ca is detected in 24 DAZ; in 25 mostly hot objects the observed lines must be interstellar. We also rediscover 9 strong H and K lines in helium-dominated atmospheres and discover for the first time faint lines in 8 DB. Most of these also show faint hydrogen lines and are thus classified DBAZ. The distribution of metal abundances is discussed and compared with the predictions of the accretion/diffusion scenario. We argue that the observations are easier to understand in a scenario of continuous ongoing accretion with rates varying with the conditions of the ambient medium, rather than with the strongly idealized “two phase accretion/diffusion scenario” of [CITE] ([CITE], [CITE],b).
Based on data obtained at the Paranal Observatory of the European Southern Observatory for programs 165.H-0588 and 167.D-0407.
Christlieb Nn.
Homeier Derek
Koester Detlev
Napiwotzki Ralf
Reimers Dieter
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