Binary Stars As A Probe For Massive Star Evolution: A Case Of Delta Ori

Details Binary Stars As A Probe For Massive Star Evolution: A Case Of Delta Ori Binary Stars As A Probe For Massive Star Evolution: A Case Of Delta Ori

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..391k&link_type=abstract

Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he

Astronomy and Astrophysics

Astrophysics

Scientific paper

Variability of line profiles in spectra of the triple system delta Ori A with massive components Aa1, Aa2 and Ab is studied. The variability amplitude on the level of 0.5-1% of the continuum units is revealed. The detected variability is probably cyclical with a period about of 4h. In dynamical wavelet spectra of these line variations we have detected large-scale (25-50 km/s) components moving in a band from -Vsini to +Vsini for the main star Aa1. A crossing time of the band is 4-5h. However, some variable components are found outside this band, what could be related to non-radial pulsations of the fainter component Ab. The nature of this component is investigated. The evidences that it is a binary star with massive components are found.

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