Hydrodynamic Processes in Young Binary Systems as a Source of Cyclic Variations of Circumstellar Extinction

Details Hydrodynamic Processes in Young Binary Systems as a Source of Cyclic Variations of Circumstellar Extinction Hydrodynamic Processes in Young Binary Systems as a Source of Cyclic Variations of Circumstellar Extinction

2008-09-25

arxiv.org/abs/0809.4434v1

Astronomy Letters, 2007, v. 33, No 9, pp. 594-603

Astronomy and Astrophysics

Astrophysics

13 pages, 6 figures, published in Astronomy Letters (v.33, 2007)

Scientific paper

10.1134/S1063773707090034

Hydrodynamic models of a young binary system accreting matter from the remnants of a protostellar cloud have been calculated by the SPH method. It is shown that periodic variations in column density in projection onto the primary component take place at low inclinations of the binary plane to the line of sight. They can result in periodic extinction variations. Three periodic components can exist in general case. The first component has a period equal to the orbital one and is attributable to the streams of matter penetrating into the inner regions of the binary. The second component has a period that is a factor of 5-8 longer than the orbital one and is related to the density waves generated in a circumbinary (CB) disk. The third, longest period is attributable to the precession of the inner asymmetric region of CB disk. The relationship between the amplitudes of these cycles depends on the model parameters as well as on the inclination and orientation of the binary in space. We show that at a dust-to-gas ratio of 1:100 and and a mass extinction coefficient of 250 cm$^2$ g$^{-1}$, the amplitude of the brightness variations of the primary component in the V-band can reach $1^m$ at a mass accretion rate onto the binary components of $10^{-8} M_{\odot}$ yr$^{-1}$ and a $10^{\rm o}$ inclination of the binary plane to the line of sight. We discuss possible applications of the model to pre-main-sequence stars.

Affiliated with

Also associated with

No associations

Rating

Hydrodynamic Processes in Young Binary Systems as a Source of Cyclic Variations of Circumstellar Extinction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hydrodynamic Processes in Young Binary Systems as a Source of Cyclic Variations of Circumstellar Extinction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrodynamic Processes in Young Binary Systems as a Source of Cyclic Variations of Circumstellar Extinction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-182360