A new method to determine the interstellar reddening towards WN stars

Details A new method to determine the interstellar reddening towards WN stars A new method to determine the interstellar reddening towards WN stars

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..898c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, March 1990, p. 898-907.

Astronomy and Astrophysics

Astronomy

28

Interstellar Extinction, Wolf-Rayet Stars, Absorption Spectra, Emission Spectra, Magellanic Clouds, Spectral Line Width

Scientific paper

An empirical approach to determine the redding in WN stars is presented, in which the measured strengths of the emission lines of He II at 1640 and 4686 A are used to estimate the extinction. The He II emission lines at these wavelengths are compared for a number of WN stars in the Galaxy and the LMC. It is shown that the equivalent width ratios are single valued and are independent of the spectral subtypes. The reddening for stars in the Galaxy is derived using a Galactic extinction law and observed line flux ratios, showing good agreement with previous determinations of reddening. The possible application of the method to study the absorption properties of the interstellar medium in more distant galaxies is discussed.

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