Evidence for a Focused Stellar Wind at Periastron in the O + B Binary IOTA Orionis

Details Evidence for a Focused Stellar Wind at Periastron in the O + B Binary IOTA Orionis Evidence for a Focused Stellar Wind at Periastron in the O + B Binary IOTA Orionis

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.6603w&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #66.03; Bulletin of the American Astronomical Society, Vol. 24, p.1224

Astronomy and Astrophysics

Astronomy

Scientific paper

We have obtained Hα and He I lambda 6678 line profiles of the eccentric orbit binary iota Orionis (O9 III + B1 III). We applied a tomography algorithm which uses the established orbital velocity curves and intensity ratio to re-construct the spectral line profiles for the individual components. The He I profiles appear as pure photospheric features and the Hα line shows variable emission in the line core throughout the orbit (which is quite typical of O-type giants). However, an emission feature appears in the blue wings of the Hα profiles (near -550 km s(-1) ) at periastron. We show that the blue wing emission feature is consistent with an origin between the component stars which probably results from a dramatic focusing of the primary's stellar wind at the time of periastron passage.

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