THE H-ALPHA BEHAVIOR IN BRIGHT GIANT STARS

We report high resolution spectroscopic observations of the H alpha li ne profile for a sample of 32 bright giant stars with spectral type be tween F3 II and G5 II. By studying the link between the H alpha behavi or and the stellar rotation in such class of luminosity we have found no clear evidence that the rotational discontinuity established around F9 II is related with the H alpha profiles. No emission features, nei ther time variations or asymmetries on the H alpha line profiles have been detected for the bright giants analysed in the present work.