E(B-V) determination from an UV-visual two-colour diagram - O and B stars in the Catalogue of Stellar Ultraviolet Fluxes

Details E(B-V) determination from an UV-visual two-colour diagram - O and B stars in the Catalogue of Stellar Ultraviolet Fluxes E(B-V) determination from an UV-visual two-colour diagram - O and B stars in the Catalogue of Stellar Ultraviolet Fluxes

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987japa....8..315g&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 8, Dec. 1987, p. 315-329. Research supported by the International C

Astronomy and Astrophysics

Astronomy

4

B Stars, O Stars, Stellar Color, Ultraviolet Astronomy, Astronomical Catalogs, Colorimetry, Flux Quantization, Interstellar Extinction, Interstellar Matter

Scientific paper

For the O and B type stars in the Catalogue of Stellar Ultraviolet Fluxes, an approach is presented which does not require a precise knowledge of spectral type and luminosity class for deriving E(B-V) color excesses. The method is based on the use of an UV-visual two-color diagram; galactic variations in the interstellar extinction law are analyzed and fully taken into account. The results have been compared with those derived by using the differences between observed and intrinsic colors for stars with known spectral classification. The very good agreement in a large number of cases (94 percent) demonstrates that the present approach permits the derivation of reliable color excess values for early-type stars even if only a rough spectral classification is available.

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