The molecular counterparts of the submillimeter compact sources in L 1551 and B 335

Details The molecular counterparts of the submillimeter compact sources in L 1551 and B 335 The molecular counterparts of the submillimeter compact sources in L 1551 and B 335

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179..231w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 231-236.

Astronomy and Astrophysics

Astronomy

18

Astronomical Maps, Infrared Sources (Astronomy), Molecular Clouds, Stellar Envelopes, Submillimeter Waves, Astronomical Spectroscopy, Carbon Monoxide, Virial Theorem

Scientific paper

The authors have used the IRAM 30-m telescope (HPBW = 22 arcsec) to map the J = 1→0 transition of C18O in the neighbourhood of the embedded infrared sources in B 335 and L 1551. More limited C18O measurements have been made towards L 1455 and the authors have also observed the 13CO J = 1→0 transition towards all three of these sources. By comparing the results with previous measurements of the sub-mm dust continuum, it is concluded that the CO/H2 abundance ratios in B 335 and L 1455 may be below the average interstellar value. The authors discuss the evidence that, from virial theorem considerations as well as directly from their CO results, there is approximately a solar mass of gas orbiting in a region of approximately 1017cm radius around the central star. In the case of L 1551, a high density clump is observed which may have recently been ablated from the circumstellar region and become caught up in the red shifted flow.

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