Spectral Synthesis of Accretion Disk Winds in Cataclysmic Variables

Details Spectral Synthesis of Accretion Disk Winds in Cataclysmic Variables Spectral Synthesis of Accretion Disk Winds in Cataclysmic Variables

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35t.303p&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Scientific paper

Cataclysmic Variables (CV's) are semi-detached binary systems. Mass is transferred between the system components and accreted onto a white dwarf. When the white dwarf's magnetic field is weak, that transfer is done through an accretion disk which radiates mostly in the ultraviolet (UV). There is observational evidence of mass loss through a wind that comes from the accretion disk. In this work, a new spectral synthesis method for disks is developed. The disk is divided into concentric rings with a standard disk radial temperature distribution. For each ring the statistical equilibrium and radiative transfer equations are solved in the wind. The code CMFGEN by Hillier and Miller is used in a plane parallel geometry, and a single atmosphere of this kind is associated with each ring. Also, a modified velocity field in the wind is derived in order to take into account the depth-dependence of gravity. The ring emissions, thus calculated, are co-added and linearly corrected for aspect, limb darkening and differential rotation. This spectral synthesis model for a disk wind is parametrized by the mass loss rate dot M_{wind}, that is ˜ 1% of the dot M_{acc}. An extra fiducial function is used in order to parametrize the mass loss radial distribution. This function follows the radial viscous dissipation distribution of a standard disk. The dependence of UV emission line profiles on the mass loss rate and accretion rate is analysed and the physical properties of the wind such as temperature, density and terminal velocity are studied.

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