CO emission from evolved stars and proto-planetary nebulae

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/167052· OSTI ID:6276445

Knapp, G R; Sutin, B M; Phillips, T G; Ellison, B N; Keene, J B

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. 39 references.

• Research Organization: Princeton Univ. Observatory, NJ (USA); California Institute of Technology, Pasadena (USA)
• OSTI ID: 6276445
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 336; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBON STARS
CHALCOGENIDES
EMISSION SPECTRA
FLUID FLOW
GAS FLOW
GIANT STARS
MAIN SEQUENCE STARS
NEBULAE
OXIDES
OXYGEN COMPOUNDS
PLANETARY NEBULAE
SPECTRA
STAR EVOLUTION
STARS
STELLAR ACTIVITY
STELLAR WINDS
WOLF-RAYET STARS