Deformation of a Gravitationally Collapsing Molecular Cloud Core: Bar and Disk Formation Followed by Binary Formation

Details Deformation of a Gravitationally Collapsing Molecular Cloud Core: Bar and Disk Formation Followed by Binary Formation Deformation of a Gravitationally Collapsing Molecular Cloud Core: Bar and Disk Formation Followed by Binary Formation

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..201m&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Other

Scientific paper

We investigate dynamical collapse of a molecular cloud core with three-dimensional numerical simulations. Our simulations show that an initially spherical core produces a bar or disk during its dynamical collapse. The disk and bar formation are due to instability. Velocity perturbations grow in proportion to ρ c 1/6 where ρ c denotes the central density. The growing velocity perturbations are due to two effects, rotation and shear. Rotation makes the core spin faster to produce a disk at the center. On the other hand, velocity shear elongates or shortens the core in one direction to form a bar or non-rotating disk. When the core rotates non-uniformly, the collapse produces a disk containing a bar at its center by the growth of rotation and shear. This bar is much longer than the Jeans length and is likely to be unstable against fragmentation. We expect that the bar will evolve into a binary or multiple stars. The binary or multiple stars will be surrounded by a common disk. On the basis of our numerical simulations we give a condition for formation of a disk and bar during the isothermal collapse phase of a molecular cloud core. If the core has an oblateness of 10 % or an equivalent velocity shear at nH2 ~= 10 4 cm-3, the core produces a bar by the end of its isothermal collapse phase.

Affiliated with

Also associated with

No associations

Rating

Deformation of a Gravitationally Collapsing Molecular Cloud Core: Bar and Disk Formation Followed by Binary Formation 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 Deformation of a Gravitationally Collapsing Molecular Cloud Core: Bar and Disk Formation Followed by Binary Formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Deformation of a Gravitationally Collapsing Molecular Cloud Core: Bar and Disk Formation Followed by Binary Formation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1061422