2003A&A...408.1015L -
Astronomy and Astrophysics, volume 408, 1015-1028 (2003/9-4)
Probing the rotation curve of the outer accretion disk in FU Orionis objects with long-wavelength spectroscopy.
LODATO G. and BERTIN G.
Abstract (from CDS):
Studies of the Spectral Energy Distribution of Young Stellar Objects suggest that the outer disk of FU Orionis objects might be self-gravitating. In this paper we propose a method to test directly whether, in these objects, significant deviations from Keplerian rotation occur. In a first approach, we have used a simplified model of the disk vertical structure that allows us to quickly bring out effects related to the disk self-gravity. We find that the often studied optical and near-infrared line profiles are produced too close to the central object to provide significant evidence for non-Keplerian rotation. Based on parameters relevant for the case of FU Ori, we show that high-resolution long-wavelength spectroscopy, of the far-infrared H2 pure rotational lines (sometimes observed in ``passive'' protostellar disks) and sub-mm CO lines, should be well suited to probe the rotation curve in the outer disk, thus measuring to what extent it is affected by the disk self-gravity. The results of the present exploratory paper should be extended soon to a more realistic treatment of the disk vertical structure.
Abstract Copyright:
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Journal keyword(s):
accretion, accretion disks - gravitation - stars: pre-main sequence
Simbad objects:
2
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