Epsilon Aurigae: A Proving Ground for Dynamical Disk Models

Details Epsilon Aurigae: A Proving Ground for Dynamical Disk Models Epsilon Aurigae: A Proving Ground for Dynamical Disk Models

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2805w&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #28.05; Bulletin of the American Astronomical Society, Vol. 24, p.771

Astronomy and Astrophysics

Astronomy

Scientific paper

Epsilon Aurigae is an F0 Ia supergiant with an enigmatic companion. The companion partially eclipses the supergiant for about 2 years every 27.1 years. Observed light curves indicate that the eclipsing object is not appreciably convex and it has thus been characterized as a totally opaque disk viewed edge-on or nearly so. We have modeled the disk as an ensemble of gas and dust rotating about an embedded star. In our nondimensional hydrodynamic model, the disk is supported by centrifugal force and gas pressure against gravitational collapse. We produce synthetic light curves for the eclipse of the supergiant by the disk. For certain density distributions more blockage of light occurs at second and third contacts than at mid-eclipse. This effect may explain the small central brightening observed during the broad light minimum. Thermal heating of portions of the secondary facing the primary will increase the disk's height at the edge facing the primary. The differential expansion offers an explanation of the observed asymmetry in the strength of line profile versus time relative to mid-eclipse. Orbital inclination and eccentricity effects are also explored.

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