Possible detection of Lyman alpha emission in the A7 III star gamma Bootis
Freire Ferrero, R.; Catalano, S.; Gouttebroze, P.; Marilli, E.
Italy, France
Abstract
We analyze the archive high dispersion IUE spectrum SWP 10885 of Gamma Boo (A7 III) in the Ly-alpha region, using our own software. A faint stellar emission overlayed by a saturated interstellar absorption is detected. This result and the previous detection of Ly-alpha emission in Altair and Alpha Cep do suggest that the presence of chromospheric emission is a common characteristic of main sequence and giant stars of spectral type A7.