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HD 149216


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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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观测天体数据

星座:蛇夫座
右阿森松:16h33m51.09s
赤纬:-14°27'59.9"
视星:7.774
距离:111.235 天文距离
右阿森松适当运动:-58.2
赤纬适当运动:-20.5
B-T magnitude:9.36
V-T magnitude:7.905

目录:
适当名称
HD 1989HD 149216
TYCHO-2 2000TYC 5639-395-1
USNO-A2.0USNO-A2 0750-09834800
HIPHIP 81098

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