Lowell Observatory Colloquia

Study of the duplicity and the multiplicity in the Sco-Cen Complex (Sco OB2)

Christian Nitschelm, Universidad Catolica del Norte, Chile

Lowell Observatory, Giclas Lecture Hall, 31 May, 2012 at 3:30 p.m.

The Sco-Cen Complex is composed of three nearby southern OB associations: Lower Centaurus Crux,Upper Centaurus Lupus and Upper Scorpius. Each of these contains more than one hundred and fifty stars, supergiants as well as giants, bright early-type as well as fainter late-type, main sequence as well as pre-main sequence. Using the literature, the Simbad database, the results from the Hipparcos astrometry satellite and our own research programme, we have created a catalogue of secure and possible members of the Sco-Cen Complex, in the framework of a more specific study of the binary population in nearby OB associations. In this talk, we present our new catalogue and some results we were able to derive from it, mainly about the present knowledge of the duplicity and the multiplicity throughout the Sco-Cen Complex. We also discuss our observations (still under reduction).

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