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Title: [OI] 6300 angstrom emission in Herbig Ae/Be systems: Signature of Keplerian rotation
Authors: Acke, Bram ×
van den Ancker, ME
Dullemond, CP #
Issue Date: Jun-2005
Publisher: E d p sciences
Series Title: Astronomy & astrophysics vol:436 issue:1 pages:209-230
Abstract: We present high spectral-resolution optical spectra of 49 Herbig Ae/Be stars in a search for the [OI] 6300 angstrom line. The vast majority of the stars in our sample show narrow (FWHM < 100 km s(-1)) emission lines, centered on the stellar radial velocity. In only three sources is the feature much broader (similar to 400 km s(-1)), and strongly blueshifted (-200 km s(-1)) compared to the stellar radial velocity. Some stars in our sample show double-peaked line profiles, with peak-to-peak separations of similar to 10 km s(-1). The presence and strength of the [OI] line emission appears to be correlated with the far-infrared energy distribution of each source: stars with a strong excess at 60 mu m have in general stronger [OI] emission than stars with weaker 60 mu m excesses. We interpret these narrow [OI] 6300 angstrom line profiles as arising in the surface layers of the protoplanetary disks surrounding Herbig Ae/Be stars. A simple model for [OI] 6300 angstrom line emission due to the photodissociation of OH molecules shows that our results are in quantitative agreement with that expected from the emission of a flared disk if the fractional OH abundance is similar to 5 x 10(-7).
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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