Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336..822k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 15, 1989, p. 822-831.
Astronomy and Astrophysics
Astronomy
55
Carbon Monoxide, Emission Spectra, Planetary Nebulae, Protoplanets, Stellar Envelopes, Carbon Stars, Color-Color Diagram, Infrared Astronomy Satellite, Peculiar Stars, S Stars, Wolf-Rayet Stars
Scientific paper
The first observations of circumstellar CO emission from cool evolved giant stars using the Caltech 10.4 m submillimeter telescope are reported. New detections, some tentative, were made of 16 stars, mostly south of -20 deg declination. Among the objects detected are the nearby S star Pi1 Gru; the peculiar stars IRAS 15194-5115, IRAS 19500-1709, and IRAS 23321+6545; the supergiant OH/IR star VX Sgr; and possibly the WC10 Wolf-Rayet star CPD -56 deg 8032 - this observation helps establish the identification of cool WC10 stars with planetary nebula nuclei. The CO outflow velocity for VX Sgr is about 30 Km/s, while that measured by OH maser emission is 19 Km/s, showing that the wind velocity for VX Sgr continues to increase to very large distances from the star. The location of the peculiar cool stars on IRAS color-color diagrams and the detection of circumstellar CO suggests that they are proto-planetary nebulae.
Ellison Brian N.
Keene J. B.
Knapp Gillan R.
Leighton Robert B.
Masson Colin R.
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