Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214...86c&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, May 15, 1977, p. 86-91.
Astronomy and Astrophysics
Astrophysics
19
Interstellar Matter, Line Spectra, Absorption Spectra, Abundance, Astronomical Models, Chemical Composition, Early Stars, Infrared Spectra, Particle Size Distribution, Polarized Radiation
Scientific paper
The properties of the interstellar medium along the line of sight to the small number of stars whose wavelength of maximum interstellar polarization is greater than or equal to 6500 A are studied. The optical interstellar line measurements reported confirm the hypothesis that the long maximum wavelength phenomenon occurs in regions where the mean grain size is abnormally large, and that this takes place only in the densest parts of the interstellar medium. The grains grow by accretion from the gas, not by coalescence of previously existing grains. Furthermore, the material accreted in the dense clouds (i.e., the mantle) must have a different chemical composition from the grain core; it must consist of substances composed largely of hydrogen.
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