Statistics – Computation
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..761h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Feb. 15, 1986, p. 761-773.
Statistics
Computation
216
Accretion Disks, Emission Spectra, Line Shape, Line Spectra, Optical Thickness, Spectrum Analysis, Balmer Series, Computational Astrophysics, Doppler Effect, Dwarf Novae, Kepler Laws, Shear Flow, Velocity Distribution
Scientific paper
The formation of emission lines from accretion disks are examined and simple expressions for computing the profiles of both optically thin and optically thick lines are developed. The effect of the Keplerian velocity gradient on the transfer of line radiation in the disk is taken into account to first order in H/R. Line photons that are trapped in an optically thick emission layer can escape more easily in directions along which the Keplerian shear flow provides large Doppler gradients. This anisotropy in the local emission pattern alters the shape of the global emission line profile. Synthetic emission line profiles are presented for the optically thick and optically thin limits and covering a full range of inclinations. The resemblance between the present high-inclination optically thick line profiles and the observed profiles of Balmer emission lines in eclipsing dwarf novae indicates that this local saturation effect is an important element of the line formation process in real disks.
Horne Keith
Marsh Thomas R.
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