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@article{814040,
author = {Krtička, Jiří and Kubát, Jiří},
article_location = {Les Ulis Cedex, France},
article_number = {493},
keywords = {stars: winds; outflows -- stars: mass-loss -- stars: early-type -- hydrodynamics},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
title = {CNO-driven winds of hot first stars},
url = {http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2009/02/aa10208-08/aa10208-08.html},
volume = {2009},
year = {2009}
}
TY - JOUR
ID - 814040
AU - Krtička, Jiří - Kubát, Jiří
PY - 2009
TI - CNO-driven winds of hot first stars
JF - Astronomy and Astrophysics
VL - 2009
IS - 493
SP - 585-593
EP - 585-593
PB - EDP Sciences
SN - 00046361
KW - stars: winds
KW - outflows -- stars: mass-loss -- stars: early-type -- hydrodynamics
UR - http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2009/02/aa10208-08/aa10208-08.html
N2 - During the evolution of first stars, the CNO elements may emerge on their surfaces due to the mixing processes. Consequently, these stars may have winds driven purely by CNO elements. We study the properties of such stellar winds and discuss their influence on the surrounding environment. For this purpose, we used our own NLTE models and tested which stellar parameters of the first stars at different evolutionary stages result in CNO winds. If such winds are possible, we calculate their hydrodynamic structure and predict their parameters. We show that, while the studied stars do not have any wind driven purely by hydrogen and helium, CNO driven winds exist in more luminous stars. On the other hand, for very hot stars, CNO elements are too ionized to drive a wind. In most cases the derived mass-loss rate is much less than calculated with solar mixture of elements. This is because wind mass-loss rate in present hot stars is dominated by elements heavier than CNO. We conclude that, until a sufficient amount of these elements is created, the influence of line-driven winds is relatively small on the evolution of hot stars (which are not close to the Eddington limit).
ER -
KRTIČKA, Jiří a Jiří KUBÁT. CNO-driven winds of hot first stars. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, 2009, roč.~2009, č.~493, s.~585-593. ISSN~0004-6361.
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