Rotation and Internal Gravity Waves in Low-Mass Stars

摘要: We discuss the successes and failures of self-consistent rotating models main sequence slightly evolved low-mass stars. focus in particular on strongest observational constraints which are lithium surface abundances solar rotation profile deduced from helioseismology. recall that hot side so-called dip is well explained by hydrodynamical where transport angular momentum carried out meridional circulation shear turbulence. For cooler stars however dominated another process. show internal gravity waves best candidate we explain how mass dependence this mechanism expected to resolve enigma terms rotational mixing, forming a coherent picture all masses. 1 Rotating Models Blue Side Li Dip In many locations Hertzsprung-Russell diagram, exhibit signatures processes require challenging modeling beyond standard stellar theory. context, has become major ingredient modern models, especially when abundance anomalies have be accounted for. most sophisticated theoretical developments (i.e., Zahn 1992, Maeder 1995, Talon & 1997, 1998, Palacios et al. 2003), law evolves as result contraction, expansion, loss, (hereafter MC) turbulence, mixing chemicals directly linked profile. Such self consistent treatment been successfully applied various parts HR diagram over large range masses evolutionary stages (see review Meynet 2000, papers Maeder, volume). One striking (Fig. 1). This drop-off content MS F-stars 300K Teff centered around 6700K was first discovered Hyades Wallerstein (1965) latter confirmed Boesgaard Tripicco (1986). feature appears galactic clusters older than ∼ 200 Myrs field (Balachandran 1995). (1987) noticed at also occurs sharp drop velocities Rotation then suggested play dominant role build up dip.