Millimetre and submillimetre molecular line observations of the southwest lobe of L 1551 - Evidence of a shell structure

Details Millimetre and submillimetre molecular line observations of the southwest lobe of L 1551 - Evidence of a shell structure Millimetre and submillimetre molecular line observations of the southwest lobe of L 1551 - Evidence of a shell structure

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179..237r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 237-248. SERC-supported research.

Astronomy and Astrophysics

Astronomy

17

Interstellar Matter, Line Spectra, Millimeter Waves, Molecular Spectra, Stellar Envelopes, Submillimeter Waves, Astronomical Maps, Carbon Monoxide, Infrared Sources (Astronomy), Red Shift, Stellar Evolution

Scientific paper

Observations have been made of the southwest outflow lobe of L 1551 in several millimetre and submillimetre molecular lines. Maps have been made in the J = 3-2 and J = 2-1 transitions of CO over areas of 7.5 by 2.5 arcmin and 5 by 5 arcmin respectively, using the 3.8 m United Kingdom Infrared Telescope (UKIRT). Higher angular resolution maps have also been made in the J = 2-1 CO transition over an area of about 6 by 3.5 arcmin with the NRAO 12 m telescope, and additional observations of the J = 4-3 transitions of HCN, HCO+, and H13CO+ were obtained towards selected positions. The observations, showing a shell structure, an accelerating outflow and possible rotation of the outflowing gas, suggest that the Sweeping-Magnetic-Twist model of Uchida and Shibata is the most appropriate of currently available models of bipolar sources, to explain the L 1551 bipolar outflow.

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