Number of the records: 1
The double degenerate system NLTT 11748
- 1.
SYSNO ASEP 0354849 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The double degenerate system NLTT 11748 Author(s) Kawka, Adela (ASU-R) ORCID, RID
Vennes, Stephane (ASU-R) ORCID, RID
Vaccaro, T.R. (US)Source Title Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 516, Jun-Jul (2010), L7/1-L7/4Number of pages 4 s. Language eng - English Country FR - France Keywords close binaries ; white dwarfs Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects IAA300030908 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GAP209/10/0967 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10030501 - ASU-R (2005-2011) UT WOS 000280275400007 DOI 10.1051/0004-6361/201014796 Annotation We show that the extremely low-mass white dwarf NLTT 11748 (0.17 of solar mass) 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 Halpha core and determined an orbital period of 5.64 h. The velocity semi-amplitude (K = 274.8 km/s) and orbital period imply that it is a degenerate star, and that the minimum mass for the companion is 0.75 of solar mass (assuming a mass of 0.167 of solar mass for the primary). Our analysis of Balmer line profiles shows that a 0.75 of solar mass 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. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2011
Number of the records: 1