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Proceedings Paper

The 2008-2009 outburst of the young binary system Z CMa unraveled by interferometry with high spectral resolution
Author(s): Fabien Malbet; Myriam Benisty; Catherine Dougados; Antonella Natta; Jean-Baptiste Le Bouquin; Fabrizzio Massi; Jérôme Bouvier; Konstantin Grankin; Mickaël Bonnefoy; Emma Whelan
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Paper 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.

Paper Details

Date Published: 2 August 2010
PDF: 12 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 773427 (2 August 2010); doi: 10.1117/12.857586
Show Author Affiliations
Fabien Malbet, Lab. d'Astrophysique de Grenoble, Univ. Joseph Fourier, CNRS (France)
Myriam Benisty, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Catherine Dougados, Lab. d'Astrophysique de Grenoble, Univ. Joseph Fourier, CNRS (France)
Antonella Natta, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Jean-Baptiste Le Bouquin, Lab. d'Astrophysique de Grenoble, Univ. Joseph Fourier, CNRS (France)
Fabrizzio Massi, INAF, Osservatorio Astrofisico di Arcetri (Italy)
Jérôme Bouvier, Lab. d'Astrophysique de Grenoble, Univ. Joseph Fourier, CNRS (France)
Konstantin Grankin, Crimean Astrophysical Observatory (Ukraine)
Mickaël Bonnefoy, Lab. d'Astrophysique de Grenoble, Univ. Joseph Fourier, CNRS (France)
Emma Whelan, Lab. d'Astrophysique de Grenoble, Univ. Joseph Fourier, CNRS (France)


Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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