Evolution of a Protobinary: Accretion Rates of the Primary and Secondary

Details Evolution of a Protobinary: Accretion Rates of the Primary and Secondary Evolution of a Protobinary: Accretion Rates of the Primary and Secondary

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...623..922o&link_type=abstract

The Astrophysical Journal, Volume 623, Issue 2, pp. 922-939.

Astronomy and Astrophysics

Astronomy

31

Accretion, Accretion Disks, Hydrodynamics, Methods: Numerical, Stars: Formation, Stars: Pre-Main-Sequence

Scientific paper

We reexamine accretion onto a protobinary based on two-dimensional numerical simulations with high spatial resolution. We focus our attention on the ratio of the primary and secondary accretion rates. Fifty-eight models are made for studying the dependence of the accretion rates on the specific angular momentum of infalling gas jinf, the mass ratio of the binary q, and the sound speed cs. When jinf is small, the binary accretes the gas mainly through two channels (type I): one through the Lagrange point L2 and the other through L3. When jinf is large, the binary accretes the gas only through the L2 point (type II). The primary accretes more than the secondary in both the cases, although the L2 point is closer to the secondary. After flowing through the L2 point, the gas flows halfway around the secondary and through the L1 point to the primary. Only a small amount of gas flows back to the secondary, and the rest forms a circumstellar ring around the primary. The boundary between types I and II depends on q. When jinf is very large, the accretion begins after several rotations (type III). The beginning of the accretion is later when jinf is larger and cs is smaller. Our result that the primary accretion rate is higher for a large jinf is qualitatively different from results of earlier simulations. The difference is mainly due to limited spatial resolution and large numerical viscosity in the numerical simulations thus far.

Affiliated with

Also associated with

No associations

Rating

Evolution of a Protobinary: Accretion Rates of the Primary and Secondary 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 Evolution of a Protobinary: Accretion Rates of the Primary and Secondary, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of a Protobinary: Accretion Rates of the Primary and Secondary will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1454303