DAZ White Dwarfs in the SPY Sample

D. Koester, K. Rollenhagen, R. Napiwotzki, B. Voss, N. Christlieb, D. Homeier, D. Reimers

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

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. 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 Dupuis et al. (1992, 1993a, 1993b).
Original languageEnglish
Title of host publicationIn: Procs of the 14TH European Workshop on White Dwarfs - ASP Conference Series 334
PublisherAstronomical Society of the Pacific
Pages215-220
ISBN (Print)1-58381-197-4, 978-1-58381-268-6
Publication statusPublished - 2005

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