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New Insights on Late-A and Early-F Star Activity

Talavera, A.; Freire Ferrero, R.; Bruhweiler, F. +3 more

The onset of chromospheric activity in late-A and early-F stars is here discussed. The detection of Ly- emission core in several A and F atars with the IUE satellite, gives evidence for the presence of chromospheric layers in these stars up to B - V = 0m.19 (Marilli et al., 1996). Semiempirical chromospheric models for Altair allowed us (Freire Fe…