The particle-size distribution in the dust ejected from IRC +10216

Details The particle-size distribution in the dust ejected from IRC +10216 The particle-size distribution in the dust ejected from IRC +10216

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..713j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 2, p. 713-718

Astronomy and Astrophysics

Astronomy

41

Carbon, Carbon Stars, Infrared Spectra, Interstellar Matter, Particle Size Distribution, Silicon Carbides, Stellar Envelopes, Stellar Mass Ejection, Stellar Models, Ultraviolet Spectra, Infrared Astronomy, Opacity, Photodissociation, Polarization Characteristics, Scattering, Ultraviolet Astronomy

Scientific paper

We propose that in the outer envelope (more than 15 sec from the star) around IRC +10216 the grains are amorphous carbon spheres of radius a with a size distribution of the form n(a) approximately equals d-3.5 exp (-a/a0) and a0 approximately equals 0.10 micrometers. Small grains (a much less than a0) are required to explain the shielding of circumstellar molecules against destruction by interstellar ultraviolet radiation. Larger grains (a much greater than a0) are required to explain the observed circumstellar polarization at the K band. In this model approximately 0.1% of the mass in the ejected dust is contained in particles that are larger than 1 micrometer in diameter. If the size distribution of the ejected SiC particles is similar to the size distribution that we derive for the amorphous carbon grains, then at least some of the micron-sized SiC inclusions in meteorites thought to originate from mass-losing carbon stars may have been produced in the outflows from stars such as IRC +10216.

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