Orbital analysis of two triple systems in the open cluster NGC2516

GONZALEZ, J. F.; VERAMENDI, M. E.

Brno, República Checa

Conferencia; Binaries - key to the comprenhension of the Universe; 2009

We report the discovery of two hierarchical triple systems in the open cluster NGC2516. Both systems are double-lined spectroscopic binaries whose center-of-mass velocity varies in a time scale of a few years. The system BDA19 consists of an eccentric spectroscopic binary with a period of 8.7 days and a third body orbiting with a period of about 3300 days. The close pair in the triple BDA2 has an orbital period of 11.2 days and contains a HgMn star.