The interstellar 2200-A band and nonspherical graphite grains

Details The interstellar 2200-A band and nonspherical graphite grains The interstellar 2200-A band and nonspherical graphite grains

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pazh...16..503v&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 16, June 1990, p. 503-511. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

Grain Size, Graphite, Interstellar Matter, Linear Polarization, Polarization Characteristics, Cosmic Dust, Ophiuchi Clouds

Scientific paper

The profile and polarization of the interstellar 22OO-A feature are computed for the case of spheroidal graphite grains with a partial alignment. Effects of grain size and shape as well as effects of degree and direction of the alignment are considered. It is shown that oblate dust grains cannot reproduce the mean observed profile of the feature considered. For this purpose, prolate grains with axial ratios a/b = 2 - 3 and rV = 0.01 - 0.02 micron (where rV is the radius of an equivolume sphere) are suitable. Observations of the star Zeta Ophiuchi are discussed.

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