The formation and fragmentation of the ring appearing in the collapse of a rotating cloud

Details The formation and fragmentation of the ring appearing in the collapse of a rotating cloud The formation and fragmentation of the ring appearing in the collapse of a rotating cloud

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.340...91c&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 340, Issue 1, pp. 91-104.

Astronomy and Astrophysics

Astronomy

26

Methods: Numerical, Binaries: General, Stars: Formation

Scientific paper

Numerical simulations of the collapse of a slowly rotating cloud have been performed, assuming either isothermality, or a barotropic equation of state that reproduces the expected thermal behaviour of protostellar gas. A ring appears in the late stages of the collapse of a rotating cloud, and we have investigated the effect of differential rotation on the formation and fragmentation of this ring. In the simulations presented here, we have used Godunov-type particle hydrodynamics to avoid the side effects of artificial viscosity in a differentially rotating cloud. The initial state of a cloud is characterized by and , where , Ω and are the thermal, gravitational and rotational energies, respectively.
If the initial angular velocity, ω, of a cloud is proportional to r-P, then in the isothermal simulations, a ring forms if P is larger than 0.5, provided βo<~ 0.035.
In the simulations using a barotropic equation of state, with αo= 0.6 and βo<~ 0.035, a ring is always formed, irrespective of whether P<= 0.5 or P > 0.5. However, the mechanism and time of ring formation are different in the two extremes, as are the final configurations. Strong differential rotation (P > 0.5) is more effective in inducing fragmentation than solid-body rotation (P= 0), in the sense that fragmentation tends to occur earlier and to produce more fragments when P is larger.

Affiliated with

Also associated with

No associations

Rating

The formation and fragmentation of the ring appearing in the collapse of a rotating cloud 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 The formation and fragmentation of the ring appearing in the collapse of a rotating cloud, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The formation and fragmentation of the ring appearing in the collapse of a rotating cloud will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1858764