NDLI: Uv line diagnostics of accretion disk winds in cataclysmic variables

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Uv line diagnostics of accretion disk winds in cataclysmic variables

Content Provider	NASA Technical Reports Server (NTRS)
Author	Shlosman, Isaac Vitello, Peter
Copyright Year	1992
Description	The IUE data base is used to analyze the UV line shapes of cataclysmic variables RW Sex, RW Tri, and V Sge. Observed lines are compared to synthetic line profiles computed using a model of rotating bi-conical winds from accretion disks. The wind model calculates the wind ionization structure self-consistently including photoionization from the disk and boundary layer and treats 3-D line radiation transfer in the Sobolev approximation. It is found that winds from accretion disks provide a good fit for reasonable parameters to the observed UV lines which include the P Cygni profiles for low inclination systems and pure emission at large inclination. Disk winds are preferable to spherical winds which originate on the white dwarf because they (1) require a much lower ratio of mass loss rate to accretion rate and are therefore more plausible energetically, (2) provide a natural source for a bi-conical distribution of mass outflow which produces strong scattering far above the disk leading to P Cygni profiles for low inclination systems, and pure line emission profiles at high inclination with the absence of eclipses in UV lines, and (3) produce rotation broadened pure emission lines at high inclination.
File Size	1930881
Page Count	61
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19920016492
Archival Resource Key	ark:/13960/t80k79312
Language	English
Publisher Date	1992-02-29
Access Restriction	Open
Subject Keyword	Astrophysics Cygnus Constellation Ultraviolet Spectra Mass Distribution Rotation Eclipses Accretion Disks Data Bases Solar Spectra Stellar Mass Accretion Cataclysmic Variables Photoionization Emission Spectra Iue Radiative Transfer Line Spectra Solar Wind Boundary Layers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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