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Astron. Astrophys. 320, 845-851 (1997)

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The H [FORMULA] behavior in bright giant stars *

A. Lèbre 1 and J.R. De Medeiros 2

1 GRAAL, CC 072, UPRESA 5024-CNRS, Université Montpellier II, F-34095 Montpellier Cedex, France
2 Departamento de Fisica, Universidade Federal do Rio Grande do Norte, 59072-970 Natal, Brazil

Received 12 June 1995 / Accepted 3 October 1996


We report high resolution spectroscopic observations of the H [FORMULA] line profile for a sample of 32 bright giant stars with spectral type between F3 II and G5 II. By studying the link between the H [FORMULA] behavior 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 [FORMULA] profiles. No emission features, neither time variations or asymmetries on the H [FORMULA] line profiles have been detected for the bright giants analysed in the present work.

Key words: stars: chromospheres – stars: atmospheres – stars: activity – stars: rotation – lines: profiles.

* based on observations at the Observatoire de Haute-Provence

Send offprint requests to: A. Lèbre, e-mail: lebre@graal.univ-montp2.fr

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998