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Thermohaline Mixing And Its Role In The Evolution Of Carbon And Nitrogen Abundances In Globular Cluster Red Giants: The Test Case Of Messier 3

Angelou, George C.; Church, Ross LU ; Stancliffe, Richard J.; Lattanzio, John C. and Smith, Graeme H. (2011) In Astrophysical Journal 728(2).
Abstract
We review the observational evidence for extra mixing in stars on the red giant branch (RGB) and discuss why thermohaline mixing is a strong candidate mechanism. We recall the simple phenomenological description of thermohaline mixing and aspects of mixing in stars in general. We use observations of M3 to constrain the form of the thermohaline diffusion coefficient and any associated free parameters. This is done by matching [C/Fe] and [N/Fe] along the RGB of M3. After taking into account a presumed initial primordial bimodality of [C/Fe] in the CN-weak and CN-strong stars, our thermohaline mixing models can explain the full spread of [C/Fe]. Thermohaline mixing can produce a significant change in [N/Fe] as a function of absolute magnitude... (More)
We review the observational evidence for extra mixing in stars on the red giant branch (RGB) and discuss why thermohaline mixing is a strong candidate mechanism. We recall the simple phenomenological description of thermohaline mixing and aspects of mixing in stars in general. We use observations of M3 to constrain the form of the thermohaline diffusion coefficient and any associated free parameters. This is done by matching [C/Fe] and [N/Fe] along the RGB of M3. After taking into account a presumed initial primordial bimodality of [C/Fe] in the CN-weak and CN-strong stars, our thermohaline mixing models can explain the full spread of [C/Fe]. Thermohaline mixing can produce a significant change in [N/Fe] as a function of absolute magnitude on the RGB for initially CN-weak stars, but not for initially CN-strong stars, which have so much nitrogen to begin with that any extra mixing does not significantly affect the surface nitrogen composition. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
globular clusters: individual (M3), stars: abundances, stars:, evolution, stars: Population II
in
Astrophysical Journal
volume
728
issue
2
publisher
University of Chicago Press
external identifiers
  • wos:000286973600006
  • scopus:84891235410
ISSN
0004-637X
DOI
10.1088/0004-637X/728/2/79
language
English
LU publication?
yes
id
e60f5cf9-d69f-4bff-8b85-f1f76465e57e (old id 1870098)
date added to LUP
2011-04-06 10:09:12
date last changed
2017-07-09 04:01:46
@article{e60f5cf9-d69f-4bff-8b85-f1f76465e57e,
  abstract     = {We review the observational evidence for extra mixing in stars on the red giant branch (RGB) and discuss why thermohaline mixing is a strong candidate mechanism. We recall the simple phenomenological description of thermohaline mixing and aspects of mixing in stars in general. We use observations of M3 to constrain the form of the thermohaline diffusion coefficient and any associated free parameters. This is done by matching [C/Fe] and [N/Fe] along the RGB of M3. After taking into account a presumed initial primordial bimodality of [C/Fe] in the CN-weak and CN-strong stars, our thermohaline mixing models can explain the full spread of [C/Fe]. Thermohaline mixing can produce a significant change in [N/Fe] as a function of absolute magnitude on the RGB for initially CN-weak stars, but not for initially CN-strong stars, which have so much nitrogen to begin with that any extra mixing does not significantly affect the surface nitrogen composition.},
  author       = {Angelou, George C. and Church, Ross and Stancliffe, Richard J. and Lattanzio, John C. and Smith, Graeme H.},
  issn         = {0004-637X},
  keyword      = {globular clusters: individual (M3),stars: abundances,stars:,evolution,stars: Population II},
  language     = {eng},
  number       = {2},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {Thermohaline Mixing And Its Role In The Evolution Of Carbon And Nitrogen Abundances In Globular Cluster Red Giants: The Test Case Of Messier 3},
  url          = {http://dx.doi.org/10.1088/0004-637X/728/2/79},
  volume       = {728},
  year         = {2011},
}