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Record Details

Record 8 of 1522
Brown dwarfs as close companions to white dwarfs
External Online Source: doi:10.1086/185651
Author and Affiliation:
Stringfellow, Guy S.(Lick Observatory, Santa Cruz, CA, United States)
Bodenheimer, Peter(Lick Observatory, Santa Cruz, CA, United States)
Black, David C.(Lunar and Planetary Institute, Houston, TX, United States)
Abstract: The influence of the radiation flux emitted by a white dwarf primary on the evolution of a closely orbiting brown dwarf (BD) companion is investigated. Full stellar evolutionary calculations are presented for both isolated and thermal bath cases, including effects of large variations in the atmospheric grain opacities. High grain opacities significantly increase the radii of the BDs, but the thermal bath does not. The major influence of the thermal bath is to increase substantially the surface temperature and luminosity of the BD at a given age. These results are compared with the observational properties of the possible BD companion of the white dwarf G29-38. Inclusion of both physical effects, high grain opacities and thermal bath, increases the mass range (0.034-0.063 solar masses) of viable models significantly, yet the final determination of whether the object is indeed a BD requires improvements in the observations of the system's properties.
Publication Date: Feb 01, 1990
Document ID:
19900037459
(Acquired Nov 28, 1995)
Accession Number: 90A24514
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters; p. L59-L62; (ISSN 0004-637X); 349
Publisher Information: United States
Contract/Grant/Task Num: NSF AST-85-21636; NSF AST-86-14510; NGT-05-061-800
Financial Sponsor: NASA; United States
Organization Source: Lick Observatory; Santa Cruz, CA, United States
Lunar and Planetary Inst.; Houston, TX, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BINARY STARS; BROWN DWARF STARS; STELLAR EVOLUTION; STELLAR RADIATION; WHITE DWARF STARS; ASTRONOMICAL MODELS; HERTZSPRUNG-RUSSELL DIAGRAM; STELLAR LUMINOSITY; STELLAR MASS; STELLAR TEMPERATURE
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 349, Feb. 1, 1990, p. L59-L62.
Availability Source: Other Sources
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