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Orbital Motions in Binary Protostellar Systems

Published online by Cambridge University Press:  22 February 2018

L.F. Rodríguez
L.F. Rodríguez*
Affiliation:
Centro de Radiostronomía y Astrofísica, UNAM, Morelia, México

Abstract

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Using high-resolution (~ 01), multi-epoch Very Large Array observations, we have detected orbital motions in several low-luminosity protobinary systems in the Taurus and ρ Ophiuchus molecular complexes. The masses obtained from Kepler’s third law are of the order of 0.5 to 2 M⊙, as expected for such low-mass protostars. The relatively large bolometric luminosities of these young systems corroborates the notion that protostars obtain most of their luminosity from accretion and not from nuclear reactions. In addition, in one of the sources studied (a multiple system in Taurus), a low-mass young star has shown a drastic change in its orbit after a close approach with another component of the system, presumed to be a double star. The large proper motion achieved by this low mass protostar (20 km s−1), suggests an ejection from the system.

Resumen

Resumen

Mediante observaciones de alta resolución con el VLA en múltiples épocas hemos detectado movimientos orbitales en varios sistemas protobinarios de baja luminosidad en los complejos moleculares de Taurus y ρ Ophiuchus. Las masas que se obtienen con la tercera ley de Kepler son del orden de 0.5 a 2M⊙, como se espera para protoestrellas de baja masa. Las luminosidades bolométricas -relativamente altas- de estos sistemas jóvenes corroboran el concepto de que las protoestrellas derivan su luminosidad principalmente de la acreción, y no de las reacciones nucleares. Además, en una de las fuentes estudiadas (un sistema múltiple en Taurus) una estrella jóven de baja masa ha mostrado un cambio drástico en su órbita, después de un encuentro cercano con otra componente del sistema, que supuestamente es una binaria. El gran movimiento propio adquirido por esta protoestrella de baja masa (20 km s-1) sugiere una expulsión del sistema.

Keywords

Astrometry — BinariesGeneral — StarsPre-Main Sequence
Type
Observational Results for Very Young Binaries
Information
International Astronomical Union Colloquium , Volume 191: The Environment and Evolution of Double and Multiple Stars , August 2004 , pp. 92 - 99
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

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