Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.303..497r&link_type=abstract
(Royal Society, Discussion on Molecules in Interstellar Space, London, England, May 20, 21, 1981.) Royal Society (London), Philo
Astronomy and Astrophysics
Astronomy
2
Astronomical Spectroscopy, Carbon Stars, Microwave Spectra, Stellar Envelopes, Carbon Monoxide, Infrared Astronomy, Shell Stars, Stellar Mass Ejection, Stellar Models
Scientific paper
According to the pattern of molecular composition, shell stars can be divided into carbon-rich and oxygen-rich objects. The prototypical carbon-rich shell star is IRC+10216. This object is one of the 'brightest' stars in the sky. However, in connection with a dust cloud enshrouding the star, its apparent magnitude at visible wavelengths is approximately 18. A detailed description of this star is provided on the basis of extensive observational work, much of it innovative. A study of the near infrared spectrum made it possible to determine a general spectral class (C type). Flux variations at all wavelengths indicate a long-period variable of the Mira type. A spectral signature near 11 micrometers indicates the possible presence of SiC grains. Some form of carbon solids must also be present. The gaseous material in the shell has been extensively studied by microwave and infrared spectroscopy.
Keady John Joseph
Ridgway Stephen T.
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