The correlation of the interstellar extinction law with the wavelength of maximum polarization

Details The correlation of the interstellar extinction law with the wavelength of maximum polarization The correlation of the interstellar extinction law with the wavelength of maximum polarization

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66...57w&link_type=abstract

Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 57-63. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astronomy

110

Astronomical Photometry, Infrared Astronomy, Interstellar Extinction, Polarization Characteristics, Correlation, Early Stars, Supergiant Stars, Tables (Data)

Scientific paper

Results are reported for IR photometry of 56 southern stars for which values of the wavelength of maximum polarization (lambdamax) are available. Lambdamax is plotted against EV-K/E sub B-V for each star, and previously published IR data are combined with these results, bringing the total number of stars for analysis to 98. The plots are evaluated separately for a group of 73 stars with apparently normal spectra and a group of 25 stars with spectral peculiarities associated with circumstellar shells. It is deduced that the ratio (R) of total to selective extinction and lambdamax are related by the formula R = 5.6 times lambdamax (in microns). It is concluded that lambdamax is generally a more reliable grain-size parameter than R and that the most reliable method of determining the visual absorption for individual stars is currently the relation AV = 5.6 (lambdamax) E sub B-V.

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