Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1010v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 3, p. 1010-1026, 1234-1237.
Astronomy and Astrophysics
Astronomy
69
Cosmic Dust, Grain Size, Ophiuchi Clouds, Star Formation, Astronomical Photometry, Astronomical Spectroscopy, Interstellar Extinction, Linear Polarization, Polarization Characteristics
Scientific paper
A polarimetric, photometric, and spectroscopic survey of 134 stars in the direction of the Rho Ophiuchi dark cloud, to an absorption depth of Av less than 5-7 mag is presented. The extinction and polarization for 19 stars foreground to the Rho Oph cloud are trivial compared to those observed through the cloud itself. The ratio of total-to-selective extinction, R, determined from the color difference method, is found to increase to R of about 4.1 at Av = 5.0 mag. Grain size, inferred from lambda max, increases with optical depth in a manner that is consistent with a simple model of coagulative grain growth. A high degree of grain alignment under a variety of ISM conditions is indicated. It is suggested that grain growth in Rho Oph is due to coagulation rather than mantle accretion.
Coyne George V.
Tapia Santiago
Vrba Frederick J.
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