Resolving the inner active accretion disk around the Herbig Be star MWC 147 with VLTI/MIDI+AMBER spectro-interferometry
Kraus, Stefan; Preibisch, Thomas; Ohnaka, Keiichi
Proceedings paper for the ESO workshop "The VLT in the ELT era"
Held in Garching from October 8-12, 2007.
Springer Astrophysics and Space Science Proceedings
"Science with the VLT in the ELT Era", pg.113-118 (2009)
Abstract
We studied the geometry of the inner (AU-scale) circumstellar environment around the Herbig Be star MWC 147. Combining, for the first time, near- (NIR, K band) and
mid-infrared (MIR, N band) spectro-interferometry on a Herbig star, our VLTI/MIDI and AMBER data constrain not only the geometry of the brightness distribution, but also
the radial temperature distribution in the disk. For our detailed modeling of the interferometric data and the spectral energy distribution, we employ 2-D radiation
transfer simulations, showing that passive irradiated Keplerian dust disks can easily fit the SED, but predict much lower visibilities than observed. Models of a Keplerian
disk with emission from an optically thick inner gaseous accretion disk (inside the dust sublimation zone), however, yield a good fit of the SED and simultaneously reproduce
the observed NIR and MIR visibilities. We conclude that the NIR continuum emission from MWC 147 is dominated by accretion luminosity emerging from an optically thick inner
gaseous disk, while the MIR emission also contains strong contributions from the outer dust disk.
You can get this publication ...