Forbidden lines in Herbig Ae/Be stars. The [O I] (1F) 6300.31 and 6363.79 lines
II. Longslit observations of selected objects *
T. Böhm 1 and
G.A. Hirth 2
Received 19 December 1996 / Accepted 6 February 1997
This paper presents first long-slit spectroscopic observations of the forbidden [O I](1F) emission line regions around selected pre-main sequence Herbig Ae/Be stars. Contrary to the lower-mass T Tauri stars, the observations show that the selected Herbig stars do not reveal neither signs of extended or positionally decentered [O I](1F) emission regions, nor signs of outflows or jets in the proximity of the stars emitting that forbidden line.
A high-velocity component in the emission profile has only been confirmed in the spectrum of the peculiar FU Ori star Z CMa, in form of a profile showing an extended blue wing; this star is likely to have a disk or a companion star.
In the case of the prototype Herbig Ae star AB Aur the derived geometrical constraints on the size of the forbidden emission line region tend to rule out the presence of a significant circumstellar accretion disk.
Key words: stars: atmospheres stars: circumstellar matter stars: pre-main sequence stars: emission-line
Send offprint requests to: T. Böhm
© European Southern Observatory (ESO) 1997
Online publication: May 26, 1998