Identification of 13 DB + dM and 2 DC + dM binaries from the Sloan Digital Sky Survey

Details Identification of 13 DB + dM and 2 DC + dM binaries from the Sloan Digital Sky Survey Identification of 13 DB + dM and 2 DC + dM binaries from the Sloan Digital Sky Survey

2005-03-23

arxiv.org/abs/astro-ph/0503491v1

Astron.Astrophys. 434 (2005) L13

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication in A&A Letters

Scientific paper

10.1051/0004-6361:200500102

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 30000 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.

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