He I 5876 å line in the study of chromospheric activity in F-type MS stars
We have measured the He I D3 line 5876 Å, in 32 F-type young open cluster stars and in 4 field stars. Combining our results with previous observations of D3 we strengthen the following conclusions: (a) Sub-surface convective zones appear, on the main sequence, around F0 (B - V 0.3). (b) The stars between F0 nd F5 (0.3 B - V 0.42) are
García López, R. J. et al.
Fecha de publicación:
0
1991