Orbital tidal variability in the eccentric early type binary IOTA Orionis

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Early Stars, Stellar Winds, Ultraviolet Spectra, Astronomical Models, B Stars, O Stars, Red Shift, Stellar Luminosity, Stellar Mass

Scientific paper

Iota Orionis is a bright, highly eccentric, massive early type binary, which has been studied recently by Stickland et al. in UV wavelengths, for evidence of stellar wind variability caused by tidal interactions between the two stars. No gross variability was found, but small scale perturbations in the UV resonance line profiles were noted. Here, using a radiatively driven stellar wind model for eccentric binaries, the results of numerical modeling of the stellar wind of Iota Orionis are presented. These calculations suggest that increased mass-loss from the primary star will occur close to the periastron passage, but that the enhancements will be short lived, and observed probably as redshifted emission features. The uncertainties in the stellar parameters of the system also make it unclear as to whether these features will be clearly observable.

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