Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mst..........1s&link_type=abstract
MS Thesis, Rice University
Astronomy and Astrophysics
Astronomy
Scientific paper
We use Smoothed Particle Hydrodynamics (SPH) to study the formation and evolution of mass streams that transfer material from a circumbinary disk to the stars of a close binary. These streams form when the disk is hot and/or viscous enough (thickness-to-radius ratio c>=0.05, for viscosity parameter alpha>0.01).
We model binaries with different mass ratios and eccentricities and calculate the spectral energy distribution of the binary-disk system, for an optically thick disk. We focus on the variation of the excess in the N band (effective wavelength 11 microns). The result of the mass streams is a considerable infrared excess that varies over the binary period.This variability is observable and can be used as a diagnostic element in the study of very close binary systems, because its presence may be a sign of stream accretion.There is a periodicity in this variation, with period equal to the binary period. The general pattern the excess follows is that it is larger at the periastron of the orbit.
We also examine the role of the temperature profile in the formation of the streams. We find that for a hotter disk (temperature profile T 1/R^{1/2}) streams form even for moderate values of thickkness-to-radius ratio (c 0.03). Thus, systems like DQ Tau (c 0.03-0.045) may have such streams.
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