New CO and HCN sources associated with IRAS carbon stars

Details New CO and HCN sources associated with IRAS carbon stars New CO and HCN sources associated with IRAS carbon stars

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180..117n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. 117-128.

Astronomy and Astrophysics

Astronomy

39

Carbon Monoxide, Carbon Stars, Hydrocyanic Acid, Infrared Astronomy Satellite, Infrared Sources (Astronomy), Molecular Spectra, Energy Distribution, Infrared Stars, Mass Transfer, Silicon Carbides, Stellar Color

Scientific paper

An unbiased sample of 53 unidentified IRAS carbon stars, based on the 12 μm flux and SiC feature contrast, was searched for CO (J = 1-0), HCN (J = 1-0) and SiC2 (505 - 404) lines. Broad CO and/or HCN lines (≥17 km s-1) were detected in 22 objects, indicating that they are evolved stars. Narrow CO lines were also found in the direction of 12 sources, but they are mostly of interstellar origin, except perhaps 3 which might possibly arise from young objects. Most of the stars detected in CO and HCN are distant (kinematic distance >2.5 kpc) but their infrared luminosity, a few 104L_sun;, is comparable to that of most of the AFGL and IRC sources. The colour-colour (12, 25, and 60 μm) diagram indicates that they have thick circumstellar dust shells of temperature ≡350 - 1000K.

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