2009A&A...506L..25K


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST09:35:22

2009A&A...506L..25K - Astronomy and Astrophysics, volume 506, L25-28 (2009/11-1)

A new extremely low-mass white dwarf in the NLTT catalogue.

KAWKA A. and VENNES S.

Abstract (from CDS):

We report on the discovery of the extremely low-mass, hydrogen-rich white dwarf, NLTT 11748. Based on measurements of the effective temperature (8540±50K) and surface gravity (logg=6.20±0.15) obtained by fitting the observed Balmer line profiles with synthetic spectra, we derive a mass of 0.167±0.005M. This object is one of only a handful of white dwarfs with masses below 0.2M that are believed to be the product of close binary evolution with an episode of Roche lobe overflow onto a degenerate companion (neutron star or white dwarf). Assuming membership in the halo population, as suggested by the kinematics and adopting a cooling age of 4.0-6.3Gyr for the white dwarf, we infer a progenitor mass of 0.87-0.93M. The likely companion has yet to be identified, but a search for radial velocity variations may help constrain its nature.

Abstract Copyright:

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

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 LP 413-40 WD* 03 45 16.8307220225 +17 48 08.697184778   17.1   16.3   DA 60 0
2 NAME Tau-Aur Region SFR 04 30 +25.0           ~ 1180 1
3 SDSS J091709.55+463821.8 WD* 09 17 09.5541879098 +46 38 21.660002558           DA 32 0
4 SDSS J123410.37-022802.9 WD* 12 34 10.3666819745 -02 28 02.812294889   17.7   18.4   DA 34 0
5 LP 400-22 WD* 22 36 30.0131205565 +22 32 23.664575923   17.5   17.1   DA+DA 37 1
6 Feige 110 HS* 23 19 58.3995050606 -05 09 56.170282845 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 536 1

    Equat.    Gal    SGal    Ecl

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2019.10.18-09:35:22

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