VLA observations of ammonia in Herbig-Haro 1-2

Details VLA observations of ammonia in Herbig-Haro 1-2 VLA observations of ammonia in Herbig-Haro 1-2

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.315..179r&link_type=abstract

In ESA, Formation of Stars and Planets, and the Evolution of the Solar System p 179-181 (SEE N91-18922 10-90)

Astronomy and Astrophysics

Astronomy

5

Ammonia, Herbig-Haro Objects, Radio Sources (Astronomy), Stellar Mass Ejection, Stellar Rotation, Very Large Array (Vla), Pre-Main Sequence Stars, Stellar Composition, Stellar Models, Stellar Motions, Stellar Spectra

Scientific paper

Very Large Array (VLA) observations of the (1,1) and (2,2) transitions of ammonia at 1.3 cm made toward VLA 1, the exciting source of the Herbig-Haro 1-2 system are presented. The morphology of the dense gas resembles an X-shaped structure, centered on VLA 1 with its waist aligned parallel to the bipolar outflow axis (which is in the north west-south east direction). There is radial velocity difference of about 2 km/s between the north west and south east halves of the X shaped structure, with the north west half being blueshifted with respect to the south east half. The relationship of this structure (with a radius of 10,000 AU) with a small scale (100 AU) circumstellar disk that is believed to surround VLA 1 is discussed.

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