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| Paper: |
The Li-Rich Giant HD 233517 |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
879 |
| Authors: |
Balachandran, Suchitra C.; Henry, Gregory W.; Fekel, Francis C. |
| Abstract: |
We present the results of our photometric and spectroscopic study of the unusual infrared-excess Li-rich giant HD 233517. Photometric monitoring shows the star to be a low-amplitude variable with a period of 47.9 days. The Li abundance derived from the resonance line is lower than that derived from the 6103 AA excited line by 0.7 dex, with the latter producing a super-meteoritic abundance of log epsilon(Li) = 4.0. The two abundance values are not reconciled when non-LTE processes in a standard atmosphere are considered. Several other ways to reconcile the differences are investigated but none is fully satisfactory yet. A cursory inspection of other Li-rich giants shows a similar effect is seen in at least one other giant, but the difference is not directly related to the level of chromospheric activity. |
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