Spectroscopic survey of galactic O and WN stars. Own Survey: New binaries and trapezium-like systems

Barbá R.H.; Arias, J. I.; Gamen, R; Morrell, N; Maíz Apellániz J.; Alfaro, E; Sota, A; Walborn N.

Abstract

High-angular resolution imaging, speckle, optical or near-infrared interferometric techniques have been used to determine the visual orbits of many nearby bright massive stars. Moreover, the combination of visual orbits and radial-velocity (RV) curves provides a method to derive the true orbit of the system, and hence, masses for each stellar component. The possibility to combine visual/spectroscopic orbits leads to the exploration of wider systems with longer periods (months to years time-scale). We are conducting a spectroscopic monitoring survey of about 240 southern galactic O and WN stars (OWN Survey). More than one hundred stars show RV variations larger than 10 km s -1, allowing us to discover 26 new spectroscopic binaries. One of our goals is to derive RVs with errors lower than 1 km s -1. One of the more remarkable discoveries of the survey is the multiple nature of the O-type system Herschel 36. © 2010: Instituto de Astronomía, UNAM.

Más información

Título de la Revista: V WORKSHOP ON ROBOTIC AUTONOMOUS OBSERVATORIES, 2017
Volumen: 38
Editorial: UNIVERSIDAD NACIONAL AUTONOMA MEXICO INSTITUTO ASTRONOMIA
Fecha de publicación: 2010
Página de inicio: 30
Página final: 32
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-80054981299&partnerID=q2rCbXpz