Accretion Disk Structure and Branch Behavior of Cygnus X-2

Details Accretion Disk Structure and Branch Behavior of Cygnus X-2 Accretion Disk Structure and Branch Behavior of Cygnus X-2

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...446..350h&link_type=abstract

Astrophysical Journal v.446, p.350

Astronomy and Astrophysics

Astronomy

18

Accretion, Accretion Disks, Stars: Individual Constellation Name: Cygnus X-2, X-Rays: Stars

Scientific paper

A new analysis of the branch behavior of Cygnus X-2 is presented, applying a new disk model with a free parameter of a radial temperature gradient, q = - d log T/d log r, for the spectral fitting. We find that the spectral fitting is significantly improved for about one third of data and that the derived q-value changes from 0.67 to 0.85 in accordance with the spectral evolution from the horizontal branch (HB) to the flaring branch (FB) via the normal branch (NB). Two positive and negative correlations are found between the inner disk radius (Rin) and q, and between Rin and the inner disk temperature (Tin) Possible new interpretations regarding the branch behavior of Cyg X-2 are discussed based on these results.

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