SIMBAD references

2000MNRAS.314..334M - Mon. Not. R. Astron. Soc., 314, 334-337 (2000/May-2)

The triple degenerate star WD 1704+481.


Abstract (from CDS):

WD 1704+481 is a visual binary in which both components are white dwarfs. We present spectra of the Hα line of both stars which show that one component (WD 1704+481.2=Sanduleak B=GR 577) is a close binary with two white dwarf components. Thus, WD 1704+481 is the first known triple degenerate star. From radial velocity measurements of the close binary we find an orbital period of 0.1448d, a mass ratio, qMbrightMfaint, of 0.70±0.03 and a difference in the gravitational redshifts of 11.5±2.3km.s–1. The masses of the close pair of white dwarfs predicted by the mass ratio and gravitational redshift difference combined with theoretical cooling curves are 0.39±0.05 and 0.56±0.07M. WD 1704+481 is therefore also likely to be the first example of a double degenerate in which the less massive white dwarf is composed of helium and the other white dwarf is composed of carbon and oxygen.

Abstract Copyright: 2000, Royal Astronomical Society

Journal keyword(s): binaries: close - binaries: spectroscopic - stars: individual: WD 1704+481 (read: WD 1704+481A, WD 1704+481B) - white dwarfs

Simbad objects: 4

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