Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..38l...3w&link_type=abstract
Astrophysics and Space Science, vol. 38, Nov. 1975, p. L3-L8.
Astronomy and Astrophysics
Astrophysics
24
Absorption Spectra, Interstellar Extinction, Interstellar Matter, Granular Materials, Hydrogen Clouds, Interstellar Gas, Polarimeters, Stellar Evolution, Stellar Radiation
Scientific paper
The present paper discusses recent research into the value of the ratio of total to selective absorption that is appropriate for compact dark clouds in which the local grain density may be several orders of magnitude greater than the mean grain density of the interstellar medium. Extinction analysis applied to stars in the sigma Oph complex are reviewed, and it is shown that the indirect polarimetric method of evaluating the absorption ratio, proposed by Serkowski et al. (1975), gives results consistent with extinction-curve determinations. It is found that a ratio of about 4.4 seems to apply to the most reddened stars in the sigma Oph complex, suggesting the existence of an upper limit on grain size. It is concluded that this value and observations of interstellar lines are consistent with a model in which heavier elements condense from the interstellar gas on to grains in the dense central region of the complex.
van Breda Ian G.
Whittet Doug C. B.
No associations
LandOfFree
The ratio of total to selective absorption in dark clouds 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 ratio of total to selective absorption in dark clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The ratio of total to selective absorption in dark clouds will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1376318