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Discussion of Observations of the Flow of Matter Within Binary Systems

Published online by Cambridge University Press:  14 August 2015

Alan H. Batten
Alan H. Batten*
Affiliation:
Dominion Astrophysical Observatory, Victoria B. C.

Abstract

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Observational determinations of density, dimensions, temperatures, and velocities of circumstellar features are surveyed and discussed, with a view to establishing limiting values that could be useful in any theoretical treatment of circumstellar structure. Densities of the order of 1013 particles cm-3 are found for streams and disks, although there is evidence for regions of much lower density in many systems, and some systems may have much denser circumstellar matter.

Dimensions of disks seem to be remarkably constant (fractional radius ∼ 0.3) in a wide variety of systems. The total mass of circumstellar matter is always a small fraction of the mass of the system. Temperatures are usually similar to the temperatures of the stars in the system, although hot spots certainly exist in some systems, and ‘flare’ activity is evidence of localized very high temperatures. On the other hand, some systems may contain solid circumstellar matter. Observed velocities are usually several hundred km s-1. The empirical relation between the velocity of rotation of disks and the orbital period is described. Finally, the stability of these features is briefly discussed.

Type
Discussion
Information
Symposium - International Astronomical Union , Volume 51: Extended Atmospheres and Circumstellar Matter in Spectroscopic Binary Systems , 1973 , pp. 1 - 21
Copyright
Copyright © Reidel 1973 

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