Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...336..535c&link_type=abstract
Astronomy and Astrophysics, v.336, p.535-538 (1998)
Astronomy and Astrophysics
Astrophysics
20
Stars: Pre-Main Sequence, Stars: Mass-Loss, Ism: Jets And Outflows
Scientific paper
We present long-slit [SII]lambda lambda 6716/6731 spectroscopic observations of the Herbig Ae/Be star, LkHα 233. An extended (>=+/-5'') high-velocity (V_rad ~ +/- 120kms() -1) 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 LkHα 233, the proposed disk has an upper limit to its projected radius of about 600 AU. The jet, at a position angle of 250(deg) , 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]lambda lambda 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). Based on observations made at the La Palma Observatory and the ESO/MPI 2.2m Telescope, La Silla.
Corcoran Marj
Ray Thomas P.
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