Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429l..33k&link_type=abstract
The Astrophysical Journal, vol. 429, no. 1, pt. 2, p. L33-L36
Astronomy and Astrophysics
Astronomy
22
Asymptotic Giant Branch Stars, Carbon Stars, Continuous Radiation, Cosmic Dust, Emission Spectra, Radio Astronomy, Stellar Envelopes, Stellar Mass, Stellar Radiation, Stellar Spectra, Submillimeter Waves, Infrared Astronomy, Very Large Array (Vla)
Scientific paper
We report the detection by the VLA of continuum emission at 8.4 GHz (3.6 cm) from the evolved carbon stars CRL 2688 and IRC +10216. The emission from CRL 2688 extends at least 15 sec (2 x 1017 cm at 1 kpc distance) from the star. Comparison with the infrared and submillimeter flux shows that the likeliest mechanism is emission from warm circumstellar dust; if so, the dust emissivity is high at wavelengths well into the radio regime; the best-fit long-wavelength power-law exponent is beta is approximately 0.8. This high emissivity shows that the dust has amorphous or layered structure and also offers the possibility of mapping the distribution of matter in circumstellar envelopes at high angular resolution at wavelengths where the emission is optically thin.
Bowers Phillip F.
Knapp Gillan R.
Phillips Thomas G.
Young Kenneth K.
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