Effects of stellar rotation in the near ultraviolet spectrum of early type stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Early Stars, Near Ultraviolet Radiation, Red Shift, Stellar Rotation, Stellar Spectra, Ultraviolet Spectra, B Stars, Color, Correlation Coefficients, Interstellar Extinction, Late Stars, O Stars, Stellar Atmospheres

Scientific paper

It is noted that rapid rotation introduces an intrinsic reddening, which is significant for the rapidly rotating Be stars, in particular the B0e. In fact, a correlation is found between E(B-V) and vsini for B0 and B4 stars. Neglecting this effect produces an overestimate of interstellar reddening which in turn yields an overcorrection of ultraviolet fluxes resulting in a spurious ultraviolet excess. Taking the problem backwards, a (B-V) color excess is calculated from ultraviolet colors which are unaffected by rotation. This excess turns out to be singificantly smaller than the observed E(B-V) for B0e stars but small for later-type stars.

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