Identification of 13 DB + dM and 2 DC + dM binaries from the sloan digital sky survey

We present the identification of 13 DB + dM binaries and 2 DC + dM binaries from the Sloan Digital Sky Survey (SDSS). Before the SDSS only 2 DB + dM binaries and 1 DC + dM binary were known. At least three, possibly 8, of the new DB + dM binaries seem to have white dwarf temperatures well above 30 0...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2005-05, Vol.434 (3), p.L13-L16
Main Authors: VAN DEN BESSELAAR, E. J. M, ROELOFS, G. H. A, NELEMANS, G. A, AUGUSTEIJN, T, GROOT, P. J
Format: Article
Language:English
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Summary:We present the identification of 13 DB + dM binaries and 2 DC + dM binaries from the Sloan Digital Sky Survey (SDSS). Before the SDSS only 2 DB + dM binaries and 1 DC + dM binary were known. At least three, possibly 8, of the new DB + dM binaries seem to have white dwarf temperatures well above 30 000 K which would place them in the so called DB-gap. Finding these DB white dwarfs in binaries may suggest that they have formed through a different evolutionary channel than the ones in which DA white dwarfs transform into DB white dwarfs due to convection in the upper layers.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:200500102