The ratio of total to selective absorption in the Carina OB2 association

Details The ratio of total to selective absorption in the Carina OB2 association The ratio of total to selective absorption in the Carina OB2 association

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.143..317g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 143, no. 2, April 1988, p. 317-328. Research supported by the Comision de

Astronomy and Astrophysics

Astrophysics

16

Absorption Spectra, Interstellar Extinction, Interstellar Matter, Nebulae, Spectrum Analysis, Star Clusters, B Stars, Distance, H Ii Regions, O Stars, Ubv Spectra

Scientific paper

Several previous studies in and around the Great Carina nebula (NGC 3372) have strongly indicated an abnormal interstellar extinction law with a high ratio of total to selective absorption R. In the present study, new UBV photometric data and accurate MK spectral-types of stars in the region of the Carina OB2 association are used to show that (1) Car OB2 is a genuine stellar association located at a distance of 3.2 kpc, and (2) the interstellar extinction law seems to be normal throughout most of the region. A representative value of R = Av/E(B - V) = 3.0 is derived for Car OB2 from the variable extinction method.

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