1998A&A...336..535C

We present long-slit [SII]λλ6716/6731 spectroscopic observations of the Herbig Ae/Be star, LkHα 233. An extended (>±5'') high-velocity (V_rad~±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).