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Astron. Astrophys. 336, 535-538 (1998)


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Spectroscopic discovery of a bipolar jet from the Herbig Ae/Be star LkH[FORMULA] 233 *

M. Corcoran 1, 2 and T.P. Ray 2

1 Service d'Astrophysiqe, CEA/DSM/DAPNIA/SAp, Centre d'Etudes de Saclay, F-91191 Gif-sur-Yvette Cedex, France
2 Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland

Received 30 March 1998 / Accepted 28 April 1998

Abstract

We present long-slit [SII][FORMULA]6716/6731 spectroscopic observations of the Herbig Ae/Be star, LkH[FORMULA]233. An extended ([FORMULA]) high-velocity (V[FORMULA] [FORMULA] 120kms[FORMULA]) bipolar Herbig-Haro (HH) jet is detected for the first time. Such jets are rare amongst Herbig Ae/Be stars. While the red-shifted counter-jet is observed to begin [FORMULA] from the centre of the stellar continuum emission, the blue-shifted jet can be traced right back to the continuum peak. We interpret this asymmetry as being due to the occultation of the counter-jet by a circumstellar disk. Given the distance to LkH[FORMULA]233, the proposed disk has an upper limit to its projected radius of about 600 AU. The jet, at a position angle of 250o, is perpendicular to the inferred disk orientation based on polarization measurements and bisects the optical bipolar nebula associated with this star.

Close to the star itself ([FORMULA]) the [SII][FORMULA]6716/6731 emission is resolved into 2 velocity components. The high velocity component can be identified with the extended jet, whereas the broad low velocity component is probably a disk wind following the suggestion of Kwan & Tademaru (1995).

Key words: stars: pre-main sequence – stars: mass-loss – ISM: jets and outflows

* Based on observations made at the La Palma Observatory and the ESO/MPI 2.2m Telescope, La Silla.

Send offprint requests to: M. Corcoran, (corcoran@discovery.saclay.cea.fr)

© European Southern Observatory (ESO) 1998

Online publication: July 20, 1998

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