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


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

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

goto Full paper

goto View the references in ADS

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 - 2023
#notes
1 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 322 2
2 LP 413-40 WD* 03 45 16.8306937296 +17 48 08.702047980   17.1   16.3   DA 70 0
3 PSR J0437-47 Psr 04 37 15.7994581776 -47 15 08.544351636           DC 847 0
4 HD 49798 HXB 06 48 04.7001531360 -44 18 58.436036028 6.758 8.017 8.287 8.391 8.543 sdO6 311 0
5 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 270 1
6 SDSS J082212.57+275307.4 WD* 08 22 12.5767704408 +27 53 07.503424512           DA 28 0
7 SDSS J084910.13+044528.7 WD* 08 49 10.1295863640 +04 45 28.707340572   19.0   19.5   DA 28 0
8 PSR J1012+5307 Psr 10 12 33.4345449600 +53 07 02.548542576     19.5     DA 345 1
9 PSR J1023+0038 LXB 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 366 0
10 SDSS J105353.89+520031.0 WD* 10 53 53.9102986512 +52 00 31.033370736           DA 32 0
11 SDSS J125733.63+542850.5 WD* 12 57 33.6542910024 +54 28 50.449435680           DA 40 0
12 SBSS 1434+503 WD* 14 36 33.2892435360 +50 10 26.924868192   18.0       DA 34 0
13 PSR J1738+0333 Psr 17 38 53.96317 +03 33 10.8390           ~ 137 1
14 PSR B1855+09 Psr 18 57 36.39161 +09 43 17.2322           DA 503 1
15 PSR J1909-3744 Psr 19 09 47.42820 -37 44 14.7740           ~ 249 2
16 PSR J1910-5959A Psr 19 11 42.7562 -59 58 26.900 22.02 22.13 22.03     DA5 87 1
17 HD 188112 HS* 19 54 31.4191828536 -28 20 20.679710640   10.01 10.22     sdB 89 0
18 LP 400-22 WD* 22 36 30.0130703280 +22 32 23.662277484   17.5   17.1   DA+DA 40 1

To bookmark this query, right click on this link: simbad:objects in 2010A&A...516L...7K and select 'bookmark this link' or equivalent in the popup menu


2023.02.04-00:21:21

© Université de Strasbourg/CNRS

    • Contact