DAZ White Dwarfs in the SPY Sample

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

DAZ White Dwarfs in the SPY Sample

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

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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 language	English
Title of host publication	In: Procs of the 14TH European Workshop on White Dwarfs - ASP Conference Series 334
Publisher	Astronomical Society of the Pacific
Pages	215-220
ISBN (Print)	1-58381-197-4, 978-1-58381-268-6
Publication status	Published - 2005

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@inproceedings{28bf91f5f21042a1bab3fb5e45193fa3,

title = "DAZ White Dwarfs in the SPY Sample",

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).",

author = "D. Koester and K. Rollenhagen and R. Napiwotzki and B. Voss and N. Christlieb and D. Homeier and D. Reimers",

note = "Original paper can be found at: http://www.astrosociety.org/pubs/cs/328.html--Copyright Astronomical Society of the Pacific",

year = "2005",

language = "English",

isbn = "1-58381-197-4",

pages = "215--220",

booktitle = "In: Procs of the 14TH European Workshop on White Dwarfs - ASP Conference Series 334",

publisher = "Astronomical Society of the Pacific",

address = "United States",

}

TY - GEN

T1 - DAZ White Dwarfs in the SPY Sample

AU - Koester, D.

AU - Rollenhagen, K.

AU - Napiwotzki, R.

AU - Voss, B.

AU - Christlieb, N.

AU - Homeier, D.

AU - Reimers, D.

N1 - Original paper can be found at: http://www.astrosociety.org/pubs/cs/328.html--Copyright Astronomical Society of the Pacific

PY - 2005

Y1 - 2005

N2 - 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).

AB - 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).

M3 - Conference contribution

SN - 1-58381-197-4

SN - 978-1-58381-268-6

SP - 215

EP - 220

BT - In: Procs of the 14TH European Workshop on White Dwarfs - ASP Conference Series 334

PB - Astronomical Society of the Pacific

ER -

DAZ White Dwarfs in the SPY Sample

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