Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161..195k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. 195-200.
Astronomy and Astrophysics
Astronomy
39
Herbig-Haro Objects, Molecular Clouds, Radio Jets (Astronomy), Star Formation, Stellar Winds, T Tauri Stars, Astronomical Spectroscopy, Electron Density (Concentration), Infrared Sources (Astronomy), Interstellar Gas, Radial Velocity, Stellar Envelopes
Scientific paper
An account is given of a bipolar Herbig-Haro jet system associated with Th 28 containing: (1) a central star-like source from which two jet-like structures emanate and (2) two Herbig-Haro objects (Th 28-HHE and Th 28 HHW) located opposite one another at distances of 0.020 and 0.024 pc from the center. The system's symmetry indicates that the interstellar medium around Th 28 has a high degree of homogeneity. A two-order-of-magnitude electron density variation was detected along the jets, and the line-of-sight velocity for both jets and HH objects was determined to be + or - 40 km/s. It is suggested that Th 28 is a novel example of a bipolar, well-collimated high-velocity outflow from a stellar object in a star-forming region. The low luminosity of its power source attests to the presence of a highly opaque disk-like circumstellar cloud oriented perpendicularly to the outflow of material.
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