SIMBAD references

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.


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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