Runaway Stars, Trapezia, and Subtrapezia

Details Runaway Stars, Trapezia, and Subtrapezia Runaway Stars, Trapezia, and Subtrapezia

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rmxac..25...13a&link_type=abstract

Third International Meeting of Dynamic Astronomy in Latin America (Eds. Carlos Abad, Ángel Bongiovanni, & Yaneth Guillén) Revist

Astronomy and Astrophysics

Astronomy

4

Binaries: Visual, Stars: Early-Type, Stars: Formation, Stars: Kinematics

Scientific paper

We studied the internal motions of the components of 44 OB trapezium-type systems using all available measures of position angles and separations over a time up to 160 years. We found that most of the trapezia have the internal motions expected for small, bound and virialized clusters. However, in some systems, we detected escaping components. We studied these components in detail and found that the fastest components among them can be classified as runaway stars. The relatively high number of runaways results from the dynamical interactions that occur in the unresolved sub-trapezia, which, in analogy with the Orion trapezium, likely constitute the brightest components of our sample of trapezia.

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