On the origin of the grain-size spectrum of interstellar dust

Details On the origin of the grain-size spectrum of interstellar dust On the origin of the grain-size spectrum of interstellar dust

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241l.105b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Oct. 15, 1980, p. L105-L107. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

86

Cosmic Dust, Interstellar Matter, Astrophysics, Grains, Interstellar Extinction, Red Giant Stars, Stellar Winds

Scientific paper

It is shown that grain-grain collisions are frequent in the atmospheres of red giants, where interstellar grains currently are believed to originate. Theoretical, as well as observational, arguments therefore suggest that grains should be injected into interstellar space with radii, a, that obey a power-law spectrum a to the -3.5 power. This is in accord with models constructed by Mathis, Rumpl, and Nordsieck (1977), and Mathis (1979), who sought to fit interstellar extinction characteristics with simple grain-size distributions. It is suggested that grain-grain collisions are also relevant in shells around novae and planetary nebulae and, thus, give the same grain-size spectrum from such sources of grains.

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