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

Full paper

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Number of rows : 19

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2023	#notes
1	SDSS J074425.43+353040.9	**	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	SDSS J093645.14+420625.6	**	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	SDSS J102131.55+511622.9	**	10 21 31.5554578440	+51 16 22.972899324	17.89	18.47		DB+M	12	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	**	11 35 42.9356466569	+35 34 23.516611300	16.9		15.0	DC+M4.5Ve	35	0
9	PG 1133+489	WD*	11 36 09.5961625656	+48 43 18.932567988	16.20	14.22		DB+dM	37	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	64	0
12	SDSS J134135.23+612128.7	**	13 41 35.2261380624	+61 21 28.475825292	18.97	19.08		DB+M	11	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	SDSS J150118.41+042232.3	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	30	0
18	SDSS J220313.29+113236.0	WD*	22 03 13.2977952864	+11 32 36.081760812	19.07	19.39		DB+M	11	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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