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Giants in the Local Region
We present parameter and abundance data for a sample of 298 nearbygiants. The spectroscopic data for this work have a resolution ofR~60,000, S/N>150, and spectral coverage from 475 to 685 nm. Overalltrends in the Z>10 abundances are dominated by Galactic chemicalevolution, while the light-element abundances are influenced by stellarevolution, as well as Galactic evolution. We find several super-Li starsin our sample and confirm that Li abundances in the first giant branchare related to mixing depths. Once astration of lithium on the mainsequence along with the overall range of main-sequence lithiumabundances are taken into account, the lithium abundances of the giantsare not dramatically at odds with the predictions of standard stellarevolution. We find the giants to be carbon-diluted in accord withstandard stellar evolution and that the carbon and oxygen abundancesdetermined for the local giants are consistent with those found in localfield dwarfs. We find that there is evidence for systematic carbonvariations in the red giant clump in the sense that the blue side of theclump is carbon-poor (more diluted) than the red side.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Tavsan |
| Sað Açýklýk: | 05h12m36.10s |
| Yükselim: | -14°57'04.0" |
| Görünürdeki Parlaklýk: | 7.292 |
| Uzaklýk: | 94.073 parsek |
| özdevim Sað Açýklýk: | 33 |
| özdevim Yükselim: | 30.7 |
| B-T magnitude: | 8.617 |
| V-T magnitude: | 7.402 |
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