• E (B-V) determination from an UV-visual two-colour diagram: O and B stars in the catalogue of stellar ultraviolet fluxes

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    • Keywords


      interstellar medium; extinction—stars; colours of—ultra-violet observations

    • Abstract


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

    • Author Affiliations


      R. K. Gulati1 2 M. L. Malagnini3 C. Morossi4

      1. International Centre for Theoretical Physics, Strada Costiera 1, Trieste - 11-34100, Italy
      2. Dipartimento di Astronomia, Universitá degli Studi di Trieste, Via Tiepolo 11, Trieste - 1-34131, Italy
      3. Dipartimento di Astronomia, Universita degli Studi di Trieste, Via Tiepolo 11, Trieste - I-34131, Italy
      4. Osservatorio Astronomico, Via Tiepolo 11, P.O. Box Succursale Trieste 5, Trieste - I-34131, Italy
    • Dates

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