Lithium in M67
Lithium in M67
复制标题
M67 中的锂
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
C. Pilachowski
中科院分区：
文献类型：
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作者：
L. Hobbs;C. Pilachowski
本文报道了在Li I 6707-A谱线上记录的7个主序列成员和1个冷亚巨星的Echelle谱。所研究的七颗矮星的光谱类型从转折点的F8左右到G5左右。主要结果是三颗最热的主序星的平均锂丰度为0.45×10~-9。因此，在过去的5Gyr期间，银河盘气体中锂的任何浓缩都没有超过大约两倍，如果考虑到NGC752和毕星座的相应结果，可能完全可以忽略不计。
Echelle spectra recorded at the Li I 6707-A line are reported for seven main-sequence members and one cool subgiant in M67. The spectral types of the seven dwarfs studied range from about F8 at the turnoff point to about G5. The principal result is that the average lithium abundance in the three hottest main-sequence stars is 0.45 x 10 to the -9th. Any enrichment of lithium in the gas of the Galactic disk in the last 5 Gyr therefore has not exceeded a factor of about two and probably is entirely negligible, when the corresponding results for NGC 752 and the Hyades are taken into account.