Recent studies of low- and intermediate-mass stars show that the evolution of
the chemical elements in these stars is very different from that proposed by
standard stellar models. Rotation-induced mixing modifies the internal chemical
structure of main sequence stars, although its signatures are revealed only
later in the evolution when the first dredge-up occurs. Thermohaline mixing is
likely the dominating process that governs the photospheric composition of
low-mass red giant branch stars and has been shown to drastically reduce the
net 3He production in these stars. The predictions of these new stellar models
need to be tested against galaxy evolution. In particular, the resulting
evolution of the light elements D, 3He and 4He should be compared with their
primordial values inferred from the Wilkinson Microwave Anisotropy Probe data
and with the abundances derived from observations of different Galactic
regions. We study the effects of thermohaline mixing and rotation-induced
mixing on the evolution of the light elements in the Milky Way. We compute
Galactic evolutionary models including new yields from stellar models computed
with thermohaline instability and rotation-induced mixing. We discuss the
effects of these important physical processes acting in stars on the evolution
of the light elements D, 3He, and 4He in the Galaxy. Galactic chemical
evolution models computed with stellar yields including thermohaline mixing and
rotation fit better observations of 3He and 4He in the Galaxy than models
computed with standard stellar yields. The inclusion of thermohaline mixing in
stellar models provides a solution to the long-standing "3He problem" on a
Galactic scale. Stellar models including rotation-induced mixing and
thermohaline instability reproduce also the observations of D and 4He.
Beschreibung
[1204.2266] Effects of thermohaline instability and rotation-induced mixing on the evolution of light elements in the Galaxy : D, 3He and 4He
%0 Generic
%1 lagarde2012effects
%A Lagarde, N.
%A Romano, D.
%A Charbonnel, C.
%A Tosi, M.
%A Chiappini, C.
%A Matteucci, F.
%D 2012
%K primordial rotation star yields
%T Effects of thermohaline instability and rotation-induced mixing on the
evolution of light elements in the Galaxy : D, 3He and 4He
%U http://arxiv.org/abs/1204.2266
%X Recent studies of low- and intermediate-mass stars show that the evolution of
the chemical elements in these stars is very different from that proposed by
standard stellar models. Rotation-induced mixing modifies the internal chemical
structure of main sequence stars, although its signatures are revealed only
later in the evolution when the first dredge-up occurs. Thermohaline mixing is
likely the dominating process that governs the photospheric composition of
low-mass red giant branch stars and has been shown to drastically reduce the
net 3He production in these stars. The predictions of these new stellar models
need to be tested against galaxy evolution. In particular, the resulting
evolution of the light elements D, 3He and 4He should be compared with their
primordial values inferred from the Wilkinson Microwave Anisotropy Probe data
and with the abundances derived from observations of different Galactic
regions. We study the effects of thermohaline mixing and rotation-induced
mixing on the evolution of the light elements in the Milky Way. We compute
Galactic evolutionary models including new yields from stellar models computed
with thermohaline instability and rotation-induced mixing. We discuss the
effects of these important physical processes acting in stars on the evolution
of the light elements D, 3He, and 4He in the Galaxy. Galactic chemical
evolution models computed with stellar yields including thermohaline mixing and
rotation fit better observations of 3He and 4He in the Galaxy than models
computed with standard stellar yields. The inclusion of thermohaline mixing in
stellar models provides a solution to the long-standing "3He problem" on a
Galactic scale. Stellar models including rotation-induced mixing and
thermohaline instability reproduce also the observations of D and 4He.
@misc{lagarde2012effects,
abstract = {Recent studies of low- and intermediate-mass stars show that the evolution of
the chemical elements in these stars is very different from that proposed by
standard stellar models. Rotation-induced mixing modifies the internal chemical
structure of main sequence stars, although its signatures are revealed only
later in the evolution when the first dredge-up occurs. Thermohaline mixing is
likely the dominating process that governs the photospheric composition of
low-mass red giant branch stars and has been shown to drastically reduce the
net 3He production in these stars. The predictions of these new stellar models
need to be tested against galaxy evolution. In particular, the resulting
evolution of the light elements D, 3He and 4He should be compared with their
primordial values inferred from the Wilkinson Microwave Anisotropy Probe data
and with the abundances derived from observations of different Galactic
regions. We study the effects of thermohaline mixing and rotation-induced
mixing on the evolution of the light elements in the Milky Way. We compute
Galactic evolutionary models including new yields from stellar models computed
with thermohaline instability and rotation-induced mixing. We discuss the
effects of these important physical processes acting in stars on the evolution
of the light elements D, 3He, and 4He in the Galaxy. Galactic chemical
evolution models computed with stellar yields including thermohaline mixing and
rotation fit better observations of 3He and 4He in the Galaxy than models
computed with standard stellar yields. The inclusion of thermohaline mixing in
stellar models provides a solution to the long-standing "3He problem" on a
Galactic scale. Stellar models including rotation-induced mixing and
thermohaline instability reproduce also the observations of D and 4He.},
added-at = {2012-04-12T18:27:13.000+0200},
author = {Lagarde, N. and Romano, D. and Charbonnel, C. and Tosi, M. and Chiappini, C. and Matteucci, F.},
biburl = {https://www.bibsonomy.org/bibtex/2d43c4ccb1d958ef26f8950d7d24ca69d/miki},
description = {[1204.2266] Effects of thermohaline instability and rotation-induced mixing on the evolution of light elements in the Galaxy : D, 3He and 4He},
interhash = {e8b1f7baceb402dc7e4e6ed343a1784a},
intrahash = {d43c4ccb1d958ef26f8950d7d24ca69d},
keywords = {primordial rotation star yields},
note = {cite arxiv:1204.2266Comment: 12 pages, 9 figures, accepted for publication in A&A},
timestamp = {2012-04-12T18:27:13.000+0200},
title = {Effects of thermohaline instability and rotation-induced mixing on the
evolution of light elements in the Galaxy : D, 3He and 4He},
url = {http://arxiv.org/abs/1204.2266},
year = 2012
}