2007ApJ...661L.179G

Query : 2007ApJ...661L.179G

2007ApJ...661L.179G - Astrophys. J., 661, L179-L182 (2007/June-1)

Evidence of a merger of binary white dwarfs: the case of GD 362.

GARCIA-BERRO E., LOREN-AGUILAR P., PEDEMONTE A.G., ISERN J., BERGERON P., DUFOUR P. and BRASSARD P.

Abstract (from CDS):

GD 362 is a massive white dwarf with a spectrum suggesting a H-rich atmosphere that also shows very high abundances of Ca, Mg, Fe, and other metals. However, for pure H-atmospheres, the diffusion timescales are so short that very extreme assumptions have to be made to account for the observed abundances of metals. The most favored hypothesis is that the metals are accreted from either a dusty disk or an asteroid belt. Here we propose that the envelope of GD 362 is dominated by He, which at these effective temperatures is almost completely invisible in the spectrum. This assumption strongly alleviates the problem, since the diffusion timescales are much larger for He-dominated atmospheres. We also propose that the He-dominated atmosphere of GD 362 is likely to be the result of the merger of a binary white dwarf, a very rare event in our Galaxy, since the expected Galactic rate is ∼10^–2/yr.

Abstract Copyright: ∼

Journal keyword(s): Stars: Chemically Peculiar - Stars: Individual: Alphanumeric: GD 362 - Stars: White Dwarfs

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	GD 362	WD*	17 31 34.3168718112	+37 05 20.711767812		16.3		16.4		DAZB	200	0

Query : 2007ApJ...661L.179G

Basic data :

GD 362 -- White Dwarf

PM* (2018yCat,G,...), WD* (2023MNRAS,EGGR,...), * (GD,USNO,...), WD? (2018MNRAS), UV (GALEX,PG), MIR (WISEA,WISE), NIR (2MASS)

17 31 34.3168718112 +37 05 20.711767812 (Optical) [ 0.0267 0.0310 90 ] A 2020yCat.1350....0G

17 29 50.5692995964 +37 07 39.246495081 [ 0.0267 0.0310 90 ]

061.7511591287201 +31.1585589243228 [ 0.0267 0.0310 90 ]

24.010 -216.977 [0.033 0.043 90] A 2020yCat.1350....0G

17.8145 [0.0332] A 2020yCat.1350....0G

DAZB D 2012ApJ...760..123R

B 16.3 [~] E 2003AJ....125..984M

R 16.4 [~] E 2003AJ....125..984M

G 16.028793 [0.002839] C 2020yCat.1350....0G

J 16.162 [0.093] C 2003yCat.2246....0C

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`GD 362`	`LSPM J1731+3705`	`TIC 88844987`	`WISE J173134.34+370518.5`
`EGGR 545`	`2MASS J17313433+3705209`	`USNO-B1.0 1270-00310327`	`Gaia DR2 1336442472164656000`
`GALEX J173134.3+370519`	`NLTT 44986`	`WD 1729+371`	`Gaia DR3 1336442472164656000`
`G 204-14`	`PG 1729+371`	`WISEA J173134.33+370518.4`

References (200 between 1850 and 2026) (Total 200)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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`GALEX J173134.3+370519`	`G 204-14`	`LSPM J1731+3705`	`2MASS J17313433+3705209`	`NLTT 44986`
`PG 1729+371`	`USNO-B1.0 1270-00310327`	`WD 1729+371`	`WISEA J173134.33+370518.4`	`WISE J173134.34+370518.5`
`Gaia DR2 1336442472164656000`	`Gaia DR3 1336442472164656000`

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