dc.contributor.author |
Bharat Kumar, Y |
|
dc.contributor.author |
Reddy, B. E |
|
dc.date.accessioned |
2009-09-22T10:32:21Z |
|
dc.date.available |
2009-09-22T10:32:21Z |
|
dc.date.issued |
2009-09 |
|
dc.identifier.citation |
The Astrophysical Journal Letters, Vol 703, No. 1, pp. L46 - L50 |
en |
dc.identifier.issn |
0004-637X |
|
dc.identifier.uri |
http://hdl.handle.net/2248/4833 |
|
dc.description |
Open Access |
|
dc.description.abstract |
Results from high-resolution spectroscopic analysis of HD77361 are reported. LTE analysis shows that HD77361 is a K giant of atmospheric parameters: T-eff = 4580 +/- 75 K, log g = 2.5 +/- 0.1, and xi(t) = 1.40 +/- 0.5 km s(-1). We found that the atmosphere of HD 77361 is highly enriched in Li with log epsilon (Li) = 3.82 +/- 0.1. With this finding the total number of super Li-rich K giants (log epsilon(Li) >= 3.3 ISM value) known to date reached six. Contrary to first dredge-up, extra-deep mixing and the associated cool bottom processing, and other recent predictions for K giants on the red giant branch (RGB) luminosity bump phase, HD 77361 shows a very low value of C-12/C-13 = 4.3 +/- 0.5, having, simultaneously, very large amount of Li. Also, HD 77361 is the only Population I low-luminosity (log L/L-circle dot = 1.66 +/- 0.1) low-mass K giant (M = 1.5 +/- 0.2 M-circle dot) among the known super Li-rich K giants that has a very low C-12/C-13 ratio. Results of HD 77361 further constrain our theoretical understanding of Li enhancement in the atmospheres of RGB stars. |
en |
dc.language.iso |
en |
en |
dc.publisher |
The American Astronomical Society |
en |
dc.relation.uri |
http://dx.doi.org/10.1088/0004-637X/703/1/L46 |
en |
dc.rights |
© The American Astronomical Society |
en |
dc.subject |
Stars: Abundances |
en |
dc.subject |
Stars: Evolution |
en |
dc.subject |
Stars: Individual: HD 77361 |
en |
dc.subject |
Stars: Late-Type |
en |
dc.subject |
Mass Red Giants |
en |
dc.subject |
Lithium Abundances |
en |
dc.subject |
Stellar Evolution |
en |
dc.subject |
Deep Circulation |
en |
dc.subject |
Main Sequence |
en |
dc.subject |
CNO Isotopes |
en |
dc.subject |
Stars |
en |
dc.subject |
He-3 |
en |
dc.subject |
Dwarfs |
en |
dc.title |
HD 77361: a new case of super Li-rich K giant with anomalous low C-12/C-13 ratio |
en |
dc.type |
Article |
en |