Metal traces in white dwarfs of the SPY (ESO Supernova Ia Progenitor Survey) sample

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 s...

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Published in:Astronomy and astrophysics (Berlin) 2005-03, Vol.432 (3), p.1025-1032
Main Authors: Koester, D., Rollenhagen, K., Napiwotzki, R., Voss, B., Christlieb, N., Homeier, D., Reimers, D.
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stars: abundances
stars: atmospheres
stars: white dwarfs
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cited_by cdi_FETCH-LOGICAL-c487t-d00255817f8cfb0fb850bc5daff1face60bc508059332d9220a2e47afc7a00623
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creator Koester, D.
Rollenhagen, K.
Napiwotzki, R.
Voss, B.
Christlieb, N.
Homeier, D.
Reimers, D.
description 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).
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source EZB-FREE-00999 freely available EZB journals
subjects stars: abundances
stars: atmospheres
stars: white dwarfs
title Metal traces in white dwarfs of the SPY (ESO Supernova Ia Progenitor Survey) sample
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