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Astron. Astrophys. 324, 177-184 (1997)

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Forbidden lines in Herbig Ae/Be stars. The [O I] (1F) 6300.31 [FORMULA] and 6363.79 [FORMULA] lines

II. Longslit observations of selected objects *

T. Böhm 1 and G.A. Hirth 2

1 European Southern Observatory, Karl-Schwarzschildstr. 2, D-85748 Garching, Germany (tboehm @ eso.org)
2 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany (hirth @ mpia-hd.mpg.de)

Received 19 December 1996 / Accepted 6 February 1997

Abstract

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

* Based on observations collected with the 2.2 m telescope of the Max-Planck-Institut für Astronomie at Calar Alto, Spain

Send offprint requests to: T. Böhm

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© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998

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