The double degenerate system NLTT 11748

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F10%3A00354849" target="_blank" >RIV/67985815:_____/10:00354849 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The double degenerate system NLTT 11748

Original language description

We show that the extremely low-mass white dwarf NLTT 11748 (0.17 M-circle dot) 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 Ha core and determined an orbital period of 5.64 h. The velocity semi-amplitude (K = 274.8 kms(-1)) and orbital period imply that it is a degenerate star, and that the minimum mass for the companion is 0.75 M-circle dot (assuming a mass of 0.167 M-circle dot for the primary). Our analysis of Balmer line profiles shows that a 0.75 M-circle dot 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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BN - Astronomy and celestial mechanics, astrophysics

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2010

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy and Astrophysics

ISSN

0004-6361

e-ISSN

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Volume of the periodical

516

Issue of the periodical within the volume

Jun-Jul

Country of publishing house

FR - FRANCE

Number of pages

4

Pages from-to

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UT code for WoS article

000280275400007

EID of the result in the Scopus database

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