Thermohaline Mixing And Its Role In The Evolution Of Carbon And Nitrogen Abundances In Globular Cluster Red Giants: The Test Case Of Messier 3
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1870098
- author
- Angelou, George C. ; Church, Ross LU ; Stancliffe, Richard J. ; Lattanzio, John C. and Smith, Graeme H.
- organization
- publishing date
- 2011
- 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
- American Astronomical Society
- 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
- 2016-04-01 13:59:07
- date last changed
- 2024-02-25 09:09:33
@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}}, keywords = {{globular clusters: individual (M3); stars: abundances; stars:; evolution; stars: Population II}}, language = {{eng}}, number = {{2}}, publisher = {{American Astronomical Society}}, 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}}, doi = {{10.1088/0004-637X/728/2/79}}, volume = {{728}}, year = {{2011}}, }