2 August 2010 The 2008-2009 outburst of the young binary system Z CMa unraveled by interferometry with high spectral resolution
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Abstract
Z CMa is a young binary system consisting of an Herbig primary and a FU Ori companion. Both components seem to be surrounded by active accretion disks and a jet was associated to the Herbig B0. In Nov. 2008, K. Grankin discovered that Z CMa was exhibiting an outburst with an amplitude larger than any photometric variations recorded in the last 25 years. To study the innermost regions in which the outburst occurs and understand its origin, we have observed both binary components with AMBER/VLTI across the Br emission line in Dec. 2009 in medium and high spectral resolution modes. Our observations show that the Herbig Be, responsible for the increase of luminosity, also produces a strong Br emission, and they allow us to disentangle from various origins by locating the emission at each velocities through the line. Considering a model of a Keplerian disk alone fails at reproducing the asymmetric spectro-astrometric measurements, suggesting a major contribution from an outflow.
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Fabien Malbet, Fabien Malbet, Myriam Benisty, Myriam Benisty, Catherine Dougados, Catherine Dougados, Antonella Natta, Antonella Natta, Jean-Baptiste Le Bouquin, Jean-Baptiste Le Bouquin, Fabrizzio Massi, Fabrizzio Massi, Jérôme Bouvier, Jérôme Bouvier, Konstantin Grankin, Konstantin Grankin, Mickaël Bonnefoy, Mickaël Bonnefoy, Emma Whelan, Emma Whelan, } "The 2008-2009 outburst of the young binary system Z CMa unraveled by interferometry with high spectral resolution", Proc. SPIE 7734, Optical and Infrared Interferometry II, 773427 (2 August 2010); doi: 10.1117/12.857586; https://doi.org/10.1117/12.857586
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