Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..305o&link_type=abstract
Publications of the Astronomical Society of Japan, v.48, p.305-315.
Astronomy and Astrophysics
Astronomy
31
Line Profiles, Stars: Be, Stars: Circumstellar Shells, Stars: Emission Lines, Stars: Variable
Scientific paper
We have studied the variations in the Balmer-line profiles from Be-star disks with eccentric (i.e., m=1) perturbation patterns. In order to examine the effects of oscillations on the line profiles, we assumed that the nonlinear perturbation patterns are similar to the linear m=1 eigenfunctions. In addition, we assumed that the source function is constant over the entire disk. Based on these assumptions, we computed the optically-thick line profiles for various values of the disk parameters. We found that the line-profile variability due to the m=1 perturbation patterns agrees well with the observed V/R variability. We also found that the amplitude of the profile shift associated with the V/R variation is sensitive to the density gradient in the radial direction. In particular, disks in which the local density decreases as steeply as r(-3) exhibit remarkable variabilities like the observed V/R variations. These variabilities occur for a wide range of disk sizes and line optical depths.
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