2005A&A...434L..13V

Query : 2005A&A...434L..13V

2005A&A...434L..13V - Astronomy and Astrophysics, volume 434, L13-16 (2005/5-2)

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

VAN DEN BESSELAAR E.J.M., ROELOFS G.H.A., NELEMANS G.A., AUGUSTEIJN T. and GROOT P.J.

Abstract (from CDS):

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 30000K 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.

Abstract Copyright: ∼

Journal keyword(s): binaries: spectroscopic - white dwarfs - stars: late-type - stars: evolution

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 GALEX J074425.4+353040 WD* 07 44 25.4346263520 +35 30 40.831443468   18.70 18.88     DC+M 13 0
2 SDSS J075235.80+401339.1 ** 07 52 35.79576 +40 13 39.0576   19.79 20.01     DB+M3V 10 0
3 SDSS J080636.86+251912.2 ** 08 06 36.8625228084 +25 19 11.924183614   19.47 19.46     DB+M3V 8 0
4 GALEX J093645.2+420625 WD* 09 36 45.1447306224 +42 06 25.705249848   20.10 20.45     DB+dM5 9 0
5 SDSS J100636.39+563346.8 ** 10 06 36.3691197888 +56 33 46.610439264   19.5 19.27 18.2   DB+M4V 10 1
6 GALEX J102131.6+511624 WD* 10 21 31.5554578440 +51 16 22.972899324   17.89 18.47     DB+M 14 0
7 SDSS J113457.72+655408.7 ** 11 34 57.72504 +65 54 08.6688   17.95 18.06     DC+M4V 16 0
8 EGGR 388 WD* 11 35 42.9356466569 +35 34 23.516611300   16.9   15.0   DC+M4.5Ve 36 0
9 PG 1133+489 WD* 11 36 09.5961625656 +48 43 18.932567988   16.20 14.22     DB+dM 40 0
10 CBS 47 PM* 11 38 22.2134891435 +32 24 49.326184361   15.5   14.3   DB/sdOB+M 5 0
11 GD 325 WD* 13 36 01.8224904648 +48 28 46.249072104   13.91 13.98 14.42   DB4 67 0
12 GALEX J134135.2+612128 WD* 13 41 35.2261380624 +61 21 28.475825292   18.97 19.08     DB+M 12 1
13 SDSS J143222.06+611231.1 ** 14 32 22.0221258336 +61 12 31.429462068   18.27 18.57     DB+M 13 0
14 2QZ J144258.5+001031 WD* 14 42 58.4717055432 +00 10 31.549276308           DB3.5+M 22 0
15 GALEX J150118.4+042233 WD* 15 01 18.4050506736 +04 22 32.317627764   19.35 19.57     DB+M 14 0
16 SDSS J162329.50+355427.2 ** 16 23 29.5049886504 +35 54 27.112717152   18.64 18.66     DB+dM 13 0
17 GD 235 WD* 21 41 28.2843598512 +11 46 22.571833836   15.88   15.2   DA3.1 32 0
18 SDSS J220313.29+113236.0 WD* 22 03 13.2977952864 +11 32 36.081760812   19.07 19.39     DB+M 13 0
19 SDSS J232438.31-093106.5 ** 23 24 38.31264 -09 31 05.7252   18.3 18.63 18.5   DB+M 12 0

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