Query : 1998A&A...336..535C

1998A&A...336..535C - Astronomy and Astrophysics, volume 336, 535-538 (1998/8-2)

Spectroscopic discovery of a bipolar jet from the Herbig Ae/Be star LkHα 233.


Abstract (from CDS):

We present long-slit [SII]λλ6716/6731 spectroscopic observations of the Herbig Ae/Be star, LkHα 233. An extended (>±5'') high-velocity (Vrad~±120km/s) 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 0.7" 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 LkHα233, the proposed disk has an upper limit to its projected radius of about 600AU. The jet, at a position angle of 250°, 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 (≲2'') the [SII]λλ6716/6731 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 (1995ApJ...454..382K).

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: mass-loss - ISM: jets and outflows - stars: individual: LkHa 233

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* V1213 Tau Or* 04 31 37.5055489536 +18 12 24.383952396           K7 540 0
2 EM* LkHA 233 Ae* 22 34 40.9923134958 +40 40 04.251892858   14.5       A7Ve 142 0

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