Detection of radio continuum emission from circumstellar dust around CRL 2688 and IRC +10216

Abstract

view Abstract Citations (26) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Detection of Radio Continuum Emission from Circumstellar Dust around CRL 2688 and IRC +10216 Knapp, G. R. ; Bowers, P. F. ; Young, K. ; Phillips, T. G. Abstract 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. Publication: The Astrophysical Journal Pub Date: July 1994 DOI: 10.1086/187406 Bibcode: 1994ApJ...429L..33K Keywords: 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); Astronomy; STARS: AGB AND POST-AGB; STARS: CARBON; STARS: INDIVIDUAL ALPHANUMERIC: CRL 2688; STARS: INDIVIDUAL ALPHANUMERIC: IRC; 10216; STARS: MASS LOSS full text sources ADS | data products SIMBAD (2)