论文标题
旋转对Messier 35中G-和K-warfs锂耗竭的影响
The effects of rotation on the lithium depletion of G- and K-dwarfs in Messier 35
论文作者
论文摘要
来自Wiyn望远镜的新的纤维光谱和径向速度用于测量242个高概率，零时代的序列（ZAMS）F- f- to rich Cluster M35的K-type成员的光晶锂。将这些与已发表的旋转期结合在一起，锂消耗和旋转之间的联系以前所未有的细节进行了研究。在$ t _ {\ rm eff} <5500 $ k时，旋转速度和较少的li耗尽之间存在牢固的关系，尽管分散剂大于测量不确定性。光度法鉴定的二进制系统的组件遵循相同的关系。在给定的$ t _ {\ rm eff} $下，更快的旋转速率（或较小的Rossby数字），LI耗竭耗尽和较大的恒星半径之间也建立了相关性。这些结果支持模型，其中星空和内部磁场导致半径膨胀，并减少了最快旋转器的主序列（PMS）相期间的LI耗竭。 However, the data are also consistent with the idea that all stars suffered lower levels of Li depletion than predicted by standard PMS models, perhaps because of deficiencies in those models or because saturated levels of magnetic activity suppress Li depletion equally in PMS stars of similar $T_{\rm eff}$ regardless of rotation rate, and that slower rotators subsequently experience more mixing and post-PMS Li depletion.
New fibre spectroscopy and radial velocities from the WIYN telescope are used to measure photospheric lithium in 242 high-probability, zero-age-main-sequence (ZAMS) F- to K-type members of the rich cluster M35. Combining these with published rotation periods, the connection between lithium depletion and rotation is studied in unprecedented detail. At $T_{\rm eff}<5500$ K there is a strong relationship between faster rotation and less Li depletion, although with a dispersion larger than measurement uncertainties. Components of photometrically identified binary systems follow the same relationship. A correlation is also established between faster rotation rate (or smaller Rossby number), decreased Li depletion and larger stellar radius at a given $T_{\rm eff}$. These results support models where starspots and interior magnetic fields lead to inflated radii and reduced Li depletion during the pre main sequence (PMS) phase for the fastest rotators. However, the data are also consistent with the idea that all stars suffered lower levels of Li depletion than predicted by standard PMS models, perhaps because of deficiencies in those models or because saturated levels of magnetic activity suppress Li depletion equally in PMS stars of similar $T_{\rm eff}$ regardless of rotation rate, and that slower rotators subsequently experience more mixing and post-PMS Li depletion.
