The ratio of total-to-selective extinction in the Chamaeleon T1 and R Coronae Australis dark clouds

Details The ratio of total-to-selective extinction in the Chamaeleon T1 and R Coronae Australis dark clouds The ratio of total-to-selective extinction in the Chamaeleon T1 and R Coronae Australis dark clouds

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..123v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 123-128. Research supported by the Research Corp.

Astronomy and Astrophysics

Astrophysics

74

Astronomical Photometry, Interstellar Extinction, Molecular Clouds, Stellar Evolution, Interstellar Matter, Orion Nebula, Ubv Spectra

Scientific paper

The ratio of total-to-selective extinction, R = A(V)/E(B-V), in the Cha T1 and R CrA dark clouds is investigated via observations of background field stars seen through these clouds. The observations consist of UBVRI and JHKL photometry as well as classification spectrograms and yield individual R values by the color difference method. R is found to be essentially normal in the outer parts of the Cha T1 dark cloud, but several stars near the opaque core of this cloud show evidence of anomalous extinction with R greater than 4. In the R CrA dark cloud, R increases with depth into the cloud and reaches clearly anomalous values of about 5 for lines of sight with A(V) = 3 mag. The results provide further evidence for anomalous interstellar extinction laws in some dense interstellar clouds.

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