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@article{925568,
author = {Krtička, Jiří and Owocki, Stanley P. and Meynet, Georges},
article_location = {Les Ulis Cedex, France},
article_number = {03},
doi = {http://dx.doi.org/10.1051/0004-6361/201015951},
keywords = {stars: mass-loss; stars: evolution; stars: rotation; hydrodynamics; stars: early-type},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
title = {Mass and angular momentum loss via decretion disks},
url = {http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201015951&Itemid=129},
volume = {527},
year = {2011}
}
TY - JOUR
ID - 925568
AU - Krtička, Jiří - Owocki, Stanley P. - Meynet, Georges
PY - 2011
TI - Mass and angular momentum loss via decretion disks
JF - Astronomy and Astrophysics
VL - 527
IS - 03
SP - "A84-1"-"A84-9"
EP - "A84-1"-"A84-9"
PB - EDP Sciences
SN - 00046361
KW - stars: mass-loss
KW - stars: evolution
KW - stars: rotation
KW - hydrodynamics
KW - stars: early-type
UR - http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201015951&Itemid=129
L2 - http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201015951&Itemid=129
N2 - We examine the nature and role of mass loss via an equatorial decretion disk in massive stars with near-critical rotation induced by evolution of the stellar interior. In contrast to the usual stellar wind mass loss set by exterior driving from the stellar luminosity, such decretion-disk mass loss stems from the angular momentum loss needed to keep the star near and below critical rotation, given the interior evolution and decline in the star’s moment of inertia. Because the specific angular momentum in a Keplerian disk increases with the square root of the radius, the decretion mass loss associated with a required level of angular momentum loss depends crucially on the outer radius for viscous coupling of the disk, and can be significantly less than the spherical, wind-like mass loss commonly assumed in evolutionary calculations. We discuss the physical processes that affect the outer disk radius, including thermal disk outflow, and ablation of the disk material via a line-driven wind induced by the star’s radiation. We present parameterized scaling laws for taking account of decretion-disk mass loss in stellar evolution codes, including how these are affected by metallicity, or by presence within a close binary and/or a dense cluster. Effects similar to those discussed here should also be present in accretion disks during star formation, and may play an important role in shaping the distribution of rotation speeds on the ZAMS.
ER -
KRTIČKA, Jiří, Stanley P. OWOCKI and Georges MEYNET. Mass and angular momentum loss via decretion disks. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, 2011, vol.~527, No~03, p.~''A84-1''-''A84-9'', 9 pp. ISSN~0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/201015951.
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