(13)CO interferometric observations of the central core of CRL 2688

Details (13)CO interferometric observations of the central core of CRL 2688 (13)CO interferometric observations of the central core of CRL 2688

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439l..13y&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 439, no. 1, p. L13-L16

Astronomy and Astrophysics

Astronomy

20

Carbon Monoxide, Emission Spectra, Line Spectra, Planetary Nebulae, Radio Astronomy, Stellar Cores, Stellar Envelopes, Astronomical Interferometry, Carbon Stars, Extremely High Frequencies, Millimeter Waves, Stellar Mass Ejection

Scientific paper

We report the results of mapping observations of a proto-planetary nebula CRL 2688 in the (13)CO J = 1-0 line with a beam size of 4.4 sec x 3.9 sec with Nobeyama Millimeter Array. Emission of (13)CO is extended by about 15 sec, which is about one-fourth of the CO envelope size observed by single-dish telescopes. The channel velocity maps show that (13)CO emission consists of three components: a spherically symmetric high-brightness core at the center, a less bright extended envelope with clumpy structure, and a high-velocity component near the center. The high-brightness central core is found to extend by about 10 sec and to appear spherically symmetric. The disk- or torus-like structure which was previously observed by others in several molecular lines is not seen in the (13)CO maps. This indicates that the gas density in the envelope does not vary much with the polar angle. The extended component is observed to spread along the symmetry axis. The peak positions of the red- and blueshifted features of the high-velocity component are found to be separated by about 3 sec.

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