Bibcode
Kilic, Mukremin; Allende-Prieto, C.; Brown, Warren R.; Agüeros, M. A.; Kenyon, S. J.; Camilo, Fernando
Bibliographical reference
The Astrophysical Journal Letters, Volume 721, Issue 2, pp. L158-L162 (2010).
Advertised on:
10
2010
Citations
21
Refereed citations
21
Description
We measure the radial velocity curve of the eclipsing detached white
dwarf binary NLTT 11748. The primary exhibits velocity variations with a
semi-amplitude of 273 km s-1 and an orbital period of 5.641
hr. We do not detect any spectral features from the secondary star or
any spectral changes during the secondary eclipse. We use our composite
spectrum to constrain the temperature and surface gravity of the primary
to be T eff = 8690 ± 140 K and log g = 6.54 ±
0.05, which correspond to a mass of 0.18 M sun. For an
inclination angle of 89fdg9 derived from the eclipse modeling, the mass
function requires a 0.76 M sun companion. The merger time for
the system is 7.2 Gyr. However, due to the extreme mass ratio of 0.24,
the binary will most likely create an AM CVn system instead of a merger.
Based on observations obtained at the MMT Observatory, a joint facility
of the Smithsonian Institution and the University of Arizona.
Related projects
Chemical Abundances in Stars
Stellar spectroscopy allows us to determine the properties and chemical compositions of stars. From this information for stars of different ages in the Milky Way, it is possible to reconstruct the chemical evolution of the Galaxy, as well as the origin of the elements heavier than boron, created mainly in stellar interiors. It is also possible to
Carlos
Allende Prieto