2010A&A...516L...7K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.06CEST20:42:10

2010A&A...516L...7K - Astronomy and Astrophysics, volume 516, L7-7 (2010/6-2)

The double degenerate system NLTT 11748.

KAWKA A., VENNES S. and VACCARO T.R.

Abstract (from CDS):

We show that the extremely low-mass white dwarf NLTT 11748 (0.17M) is in a close binary with a fainter companion. We obtained a series of radial velocity measurements of the low-mass white dwarf using the Hα core and determined an orbital period of 5.64h. The velocity semi-amplitude (K=274.8km/s) and orbital period imply that it is a degenerate star, and that the minimum mass for the companion is 0.75M (assuming a mass of 0.167M for the primary). Our analysis of Balmer line profiles shows that a 0.75M white dwarf companion does not contribute more than 2% or 5% of the flux (V-band) for helium- or hydrogen-rich surfaces, respectively. The kinematics of the system suggest that it belongs to the Galactic halo.

Abstract Copyright:

Journal keyword(s): binaries: close - stars: individual: NLTT 11748 - white dwarfs

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 298 2
2 LP 413-40 WD* 03 45 16.8307220225 +17 48 08.697184778   17.1   16.3   DA 61 0
3 PSR J0437-47 Psr 04 37 15.7976203608 -47 15 08.536908257           DC 752 0
4 HD 49798 HXB 06 48 04.7000758397 -44 18 58.432035331 6.758 8.017 8.287 8.391 8.543 sdO6 283 0
5 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 252 1
6 SDSS J082212.57+275307.4 WD* 08 22 12.5768491553 +27 53 07.504336689           DA 26 0
7 SDSS J084910.13+044528.7 WD* 08 49 10.1288325702 +04 45 28.703197981   19.0   19.5   DA 26 0
8 PSR J1012+5307 Psr 10 12 33.4341531837 +53 07 02.564526788     19.5     DA 314 1
9 PSR J1023+0038 LXB 10 23 47.6840307966 +00 38 41.006983532     17.31     GV 308 0
10 SDSS J105353.89+520031.0 WD* 10 53 53.9086791063 +52 00 31.034143401           DA 29 0
11 SDSS J125733.63+542850.5 WD* 12 57 33.6543789945 +54 28 50.446760273           DA 34 0
12 SBSS 1434+503 WD* 14 36 33.2894437161 +50 10 26.925656443   18.0       DA 30 0
13 PSR J1738+0333 Psr 17 38 53.96317 +03 33 10.8390           ~ 115 1
14 PSR B1855+09 Psr 18 57 36.39161 +09 43 17.2322           DA 477 1
15 PSR J1909-3744 Psr 19 09 47.43788 -37 44 14.3240           ~ 199 2
16 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 79 1
17 HD 188112 HS* 19 54 31.4192112333 -28 20 20.679022097   10.01 10.22     sdB 78 0
18 LP 400-22 WD* 22 36 30.0131205565 +22 32 23.664575923   17.5   17.1   DA+DA 37 1

    Equat.    Gal    SGal    Ecl

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2020.07.06-20:42:10

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