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The double degenerate system NLTT 11748
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SYSNO ASEP 0354849 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název The double degenerate system NLTT 11748 Tvůrce(i) Kawka, Adela (ASU-R) ORCID, RID
Vennes, Stephane (ASU-R) ORCID, RID
Vaccaro, T.R. (US)Zdroj.dok. Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 516, Jun-Jul (2010), L7/1-L7/4Poč.str. 4 s. Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova close binaries ; white dwarfs Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika CEP IAA300030908 GA AV ČR - Akademie věd GAP209/10/0967 GA ČR - Grantová agentura ČR CEZ AV0Z10030501 - ASU-R (2005-2011) UT WOS 000280275400007 DOI 10.1051/0004-6361/201014796 Anotace 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. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2011
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