Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437..262o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 1, p. 262-269
Astronomy and Astrophysics
Astronomy
22
Absorption Cross Sections, Astronomical Models, Cosmic Dust, Infrared Astronomy, Interstellar Extinction, Interstellar Matter, Polarization (Waves), Silicates, Cross Sections, Mathematical Models, Spheroids
Scientific paper
Absorption and polarization cross sections are calculated for spheroidal silicate grains in the wavelength regime 7-22 microns in order to investigate the effect of changes in grain composition upon the 9.7 micron and 18 micron bands. The addition of mantles is found to be incompatible with 9.7 micron absorption data unless the mantles are relatively thin and transparent. Comparison with polarization data for BN and AFGL 2591 suggests an additional absorbing component is present, possibly as inclusions within the silicate grains, in order to account for the relatively strong short-wavelength wing seen in the 9.7 micron band toward both objects. The high 18 micron polarization observed toward BN (R18/10 = 0.75) cannot be reproduced by the addition of a mantle or by varying the grain shape and implies silicates with a stronger 18 micron band than has been previously assumed in interstellar grain models.
No associations
LandOfFree
The effect of grain mantles and grain shape upon the 9.7 and 18 micron silicate features does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The effect of grain mantles and grain shape upon the 9.7 and 18 micron silicate features, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The effect of grain mantles and grain shape upon the 9.7 and 18 micron silicate features will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1326512