High spatial resolution maps of circumstellar SiC2 in IRC + 10216

Details High spatial resolution maps of circumstellar SiC2 in IRC + 10216 High spatial resolution maps of circumstellar SiC2 in IRC + 10216

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388l..31g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 388, March 20, 1992, p. L31-L34. Research supported by University

Astronomy and Astrophysics

Astrophysics

15

Carbon Stars, Silicon Carbides, Spatial Resolution, Stellar Envelopes, Emission Spectra, Interstellar Chemistry, Photosphere, Stellar Mass Ejection, Stellar Spectra

Scientific paper

This Letter presents details of the first interferometer observations of the 4(22)-3(21) transition of SiC2 at 95.57936 GHz toward IRC + 10216. It is found that most of the emission from SiC2 is distributed asymmetrically in the form of a shell. In particular, the map centered at V(LSR) = -23.8 km/s is distributed in the form of a broken ring in which the north and southeast sides are at least 3 times brighter than the west side; the ring has a radius of about 14 arcsec with a width unresolved by the beam. The results indicate that most of the SiC2 is produced by ion-molecule reactions in the outer envelope; however, a small amount of SiC2 originates near the photosphere.

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