2007MNRAS.382.1804S

Query : 2007MNRAS.382.1804S

2007MNRAS.382.1804S - Mon. Not. R. Astron. Soc., 382, 1804-1808 (2007/December-3)

Near-infrared spectroscopy of the very low mass companion to the hot DA white dwarf PG1234+482.

STEELE P.R., BURLEIGH M.R., DOBBIE P.D. and BARSTOW M.A.

Abstract (from CDS):

We present a near-infrared spectrum of the hot (Teff~55000K) hydrogen atmosphere (DA) white dwarf PG1234+482. We confirm that a very low mass companion is responsible for the previously recognized infrared photometric excess. We compare spectra of M and L dwarfs, combined with an appropriate white dwarf model, to the data to constrain the spectral type of the secondary. We find that uncertainties in the Two-Micron All-Sky Survey HK photometry of the white dwarf prevent us from distinguishing whether the secondary is stellar or substellar, and assign a spectral type of L0±1 (M9-L1).Therefore, this is the hottest and youngest (~106yr) DA white dwarf with a possible brown dwarf companion.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): binaries: spectroscopic - stars: low-mass, brown dwarfs - white dwarfs

Simbad objects: 20

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Number of rows : 20
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 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 220 1
2 WD 0137-349 WD* 01 39 42.8531929464 -34 42 39.577891392 14.60 15.33 15.30     DA3 101 0
3 GD 1400 WD* 01 47 21.8246176800 -21 56 51.386849088   15.38 15.15 15.42   DA4.1 101 0
4 V* FS Cet CV* 02 35 07.5939240480 +03 43 56.816311296 11.027 12.209 12.412 12.325 11.968 DA1+dM 379 0
5 V* EX Eri dS* 04 46 25.7495143440 -28 05 14.805163104   6.347 6.173     A7VkA3mA3 125 0
6 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
7 V* IN CMa CV* 07 20 47.9109655416 -31 47 02.732961552           DAO+dM 93 0
8 V* OY Car CV* 10 06 22.0793274312 -70 14 04.584660540           ~ 586 0
9 SDSS J103533.02+055158.4 CV* 10 35 33.0226966464 +05 51 58.334599512   18.57 18.80     DA 64 0
10 GALEX J104341.5+085558 WD* 10 43 41.5313708256 +08 55 58.340933400           DAZ 70 0
11 V* V379 Vir CV* 12 12 09.3077194872 +01 36 27.771237504           DAH 78 0
12 PG 1234+482 WD* 12 36 45.1436139768 +47 55 22.218366900     14.38     DA.9 98 2
13 PG 1241-010 WD* 12 44 28.5731497128 -01 18 57.854663568   13.86 14.00 14.3   DA2.1 63 0
14 GD 165 WD* 14 24 39.1495824408 +09 17 14.160753960   14.46 14.32 14.6 14.91 DA4.1 176 0
15 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 145 0
16 V* OV Boo CV* 15 07 22.3698571080 +52 30 39.804859764   18.7   18.5   DAe 82 0
17 GD 362 WD* 17 31 34.3168718112 +37 05 20.711767812   16.3   16.4   DAZB 200 0
18 HD 189733b Pl 20 00 43.7129433648 +22 42 39.073143456           ~ 1610 1
19 EGGR 151 WD* 21 54 06.4513977984 -01 17 09.525582096   14.728 14.515 14.373 13.990 DA5.5 61 0
20 LAWD 94 WD* 23 54 01.0726392457 -33 16 31.078214643   14.6 13.56     DA5.7 63 0

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