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Model atmosphere analysis of the DZ white dwarf K789 - 37This paper presents new observations and an analysis using model atmosphere techniques of the recently discovered DZA white dwarf K789 - 37. The effective temperature derived is 9500 + or - 500 K. Abundances are determined for the elements hydrogen, magnesium, calcium, and iron, as well as upper limits for carbon and silicon. The abundances are very low compared to solar values and within the range typical for this spectral class. The implications of the results for the currently accepted explanation of trace elements in cool white dwarfs in terms of the diffusion/accretion scenario are discussed. It is concluded that the accreted matter cannot have had solar composition.
Document ID
19900037849
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Koester, D.
(Louisiana State University Baton Rouge, United States)
Wegner, G.
(Dartmouth College Hanover, NH, United States)
Kilkenny, D.
(South African Astronomical Observatory Observatory, Republic of South Africa, United States)
Date Acquired
August 14, 2013
Publication Date
February 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 350
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A24904
Funding Number(s)
CONTRACT_GRANT: NAG5-971
CONTRACT_GRANT: NSF AST-85-15219
CONTRACT_GRANT: NSF AST-88-14711
CONTRACT_GRANT: NAG5-990
Distribution Limits
Public
Copyright
Other

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