ANS ultraviolet observations of Wolf-Rayet stars

Details ANS ultraviolet observations of Wolf-Rayet stars ANS ultraviolet observations of Wolf-Rayet stars

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26as...38..279v&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 38, Nov. 1979, p. 279-294. Research supported by the Koninklije Nederlandse

Astronomy and Astrophysics

Astronomy

32

Astronomical Netherlands Satellite, Hot Stars, Stellar Spectrophotometry, Ultraviolet Astronomy, Ultraviolet Photometry, Wolf-Rayet Stars, Bandwidth, Emission Spectra, Energy Distribution, Interstellar Extinction, Satellite Observation, Stellar Atmospheres, Stellar Magnitude, Stellar Models

Scientific paper

UV photometric data obtained with the ANS satellite for 20 single Wolf-Rayet (WR) stars are reduced to yield interstellar reddening corrections and continuous energy distributions. Absolute visual magnitudes are derived for a few WR stars for which distances are available; an absolute visual magnitude of -6.9 + or - 0.2 is obtained for three WN7 stars, which confirms that these stars have the brightest absolute visual magnitudes among the WR stars. Helium-rich theoretical and empirical WR model atmospheres are computed, energy distributions are tabulated, and the energy-distribution difference between hydrogen- and helium-rich model atmospheres is found to be very small. Comparison of the observed UV fluxes with the empirical model shows that most WN stars generally agree with that model and that the atmospheres of WC stars appear to be less extended.

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