Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..225r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 225-230.
Astronomy and Astrophysics
Astrophysics
28
Globular Clusters, Herbig-Haro Objects, Molecular Clouds, Pre-Main Sequence Stars, Star Formation, H Alpha Line, Interstellar Matter
Scientific paper
An H-alpha emission knot, discovered by Vrba et al. (1986) in the Bok globule B335, is here confirmed as a bona fide Herbig-Haro object, HH 119B. In addition, we have found two more HH objects, all of which form a highly collimated HH complex emanating from the embedded FIR source. The axis of the HH-flow coincides with that of the molecular outflow. HH 119B is a low-excitation object, whereas HH 119A, formed as a bow shock further away from the source, has higher excitation. Both are located in the red lobe of the molecular outflow. HH 119C is situated near the opposite edge of the Bok globule, in the blue lobe of the outflow. The proper motions of HH 119B and C have been measured, and show that the Herbig-Haro objects move away from the source in opposite directions along the bipolar molecular outflow with a velocity of about 200 km/s, at our assumed distance of 250 pc. This chain of HH objects suggests that the embedded energy-source has experienced several outbursts, the most recent of which were approximately 350 and 850 yr ago. We relate these outbursts to FU Orionis type eruptions due to accretion events in a circumstellar disk.
Heathcote Steve
Reipurth Bo
Vrba Frederick
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