Models of U Geminorum and Z Chamaeleontis based on disk radius variations

Details Models of U Geminorum and Z Chamaeleontis based on disk radius variations Models of U Geminorum and Z Chamaeleontis based on disk radius variations

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..266a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 266-281.

Astronomy and Astrophysics

Astrophysics

39

Accretion Disks, Cataclysmic Variables, Dwarf Novae, Stellar Mass Accretion, Stellar Models

Scientific paper

A simple model of dwarf nova accretion disks is constructed. The usual alpha-disk formalism is replaced by the assumptions that the surface density of the disk is a power function of radius and that matter falling in during quiescence accumulates in a torus at the outer edge of the disk. Applied to observations of the changes in the disk radii of U Gem and Z Cha during their outburst cycles, the model yields lower limits on the masses in the outer regions of the disks of 1 x 10 to the -9th solar mass and 5 x 10 to the -11th solar mass, respectively. These masses imply that the tori in these systems have high optical depths.

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