IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Spectroscopic survey of galactic O and WN stars. OWN Survey: new binaries and trapezium-like systems
Autor/es:
BARBÁ, R.; GAMEN, R. C.; ARIAS, J.; MORRELL, N. I.; MAÍZ APELLÁNIZ, J.; ALFARO, E.; WALBORN, N.; SOTA, A.
Lugar:
Viña del Mar, Chile
Reunión:
Workshop; The Interferometric View on Hot Stars; 2009
Institución organizadora:
Universidad de Valparaíso, Chile
Resumen:
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.