Determinations of the interstellar reddening toward Wolf-Rayet stars of the nitrogen sequence from observed UBV color indices

Details Determinations of the interstellar reddening toward Wolf-Rayet stars of the nitrogen sequence from observed UBV color indices Determinations of the interstellar reddening toward Wolf-Rayet stars of the nitrogen sequence from observed UBV color indices

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...89..259s&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 89, no. 2, Aug. 1991, p. 259-284. Research supported by SNSF

Astronomy and Astrophysics

Astrophysics

36

Astronomical Photometry, Interstellar Extinction, Red Shift, Stellar Color, Wolf-Rayet Stars, Magellanic Clouds, Milky Way Galaxy, Stellar Atmospheres, Stellar Models, Stellar Spectra

Scientific paper

The color excesses of WN stars in the Galaxy, the LMC, and the SMC were derived using the results of theoretical models. It is shown that current models provide good fits to the observed continua and predict continuum discontinuities, or 'jumps' exhibited by spectra of some Wolf-Rayet (WR) stars. Using a relation between the size of the He II jump at 3645 A and the intrinsic (b-v)0 color found from the model atmospheres of WR stars of the nitrogen sequence, a formula is derived for calculating the color excesses, E(b-v) of WN stars. Correction factors were derived from the differences in the various photometric and calibration systems used in the past to determine magnitudes and colors of WR stars, and all previous values were adjusted to one consistent system. The corrected values of the u-b and b-v colors were then used to calculate color excesses for WN stars in the Galaxy and the LMC and SMC. Good agreement was found for the Galactic stars.

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