Collapse of a Rotating Protostellar Cloud

Evidence from optical polarimetry for spiral structure in the magnetic field and cloud density around newly-formed stars

Symposium - International Astronomical Union ◽

10.1017/s0074180900156219 ◽

1987 ◽

Vol 122 ◽

pp. 129-130

Author(s):

R.F. Warren-Smith ◽

P. W. Draper ◽

S. M. Scarrott

Keyword(s):

Magnetic Field ◽

Spiral Structure ◽

Binary Star ◽

Density Structure ◽

Ccd Imaging ◽

Protostellar Cloud ◽

Binary Star System ◽

The Magnetic Field ◽

Cloud Material ◽

Cloud Core

Deep CCD imaging of the Serpens bipolar nebula shows it to be surrounded by molecular cloud material having spiral density structure. Polarization mapping indicates that the magnetic field in this material also exhibits spiral structure and we interpret this as the remains of the magnetically-braked collapse of a protostellar cloud. A binary star system has formed in the cloud core.

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Two-stage fragmentation in a rotating protostellar cloud

Astrophysics and Space Science ◽

10.1007/bf00639522 ◽

1979 ◽

Vol 64 (2) ◽

pp. 463-466 ◽

Cited By ~ 1

Author(s):

Paolo Paolicchi ◽

Stefano Siccardi

Keyword(s):

Two Stage ◽

Protostellar Cloud

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The magnetic field in a protostellar cloud

Astrophysics and Space Science ◽

10.1007/bf00658825 ◽

1990 ◽

Vol 164 (2) ◽

pp. 213-229 ◽

Cited By ~ 2

Author(s):

M. S. El-Nawawy

Keyword(s):

Magnetic Field ◽

Protostellar Cloud ◽

The Magnetic Field

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Magnetorotational Mechanism: Supernova Explosions and Ejections

Symposium - International Astronomical Union ◽

10.1017/s0074180900194252 ◽

2003 ◽

Vol 214 ◽

pp. 117-120

Author(s):

N. V. Ardeljan ◽

G. S. Bisnovatyi-Kogan ◽

S. G. Moiseenko

Keyword(s):

Magnetic Field ◽

Neutron Star ◽

Numerical Scheme ◽

Supernova Explosion ◽

Triangular Grid ◽

Different Types ◽

Protostellar Cloud ◽

Supernova Explosions ◽

Field Formation ◽

The Magnetic Field

We made simulations of the collapse of the rotating protostellar cloud. Differential rotation leads to the amplification of the toroidal component of the magnetic field and subsequent ejection of the matter due to the magnetorotational mechanism.Our results show that at different initial configurations of the magnetic field formation of qualitatively different types of explosion takes place. Magnetic field of the dipole type produces a jet-like explosion. Quadrupole-like magnetic field produces supernova explosion whith ejection presumably near equatorial plane. Quantitative estimations of the ejected mass and energy are given.We have done simulation of the collapse of the white dwarf and formation of a differentially rotating neutron star. After the collapse stage the rotating neutron star was formed. The rotation of the neutron star is strongly differential. The presence of the magnetic field (even the weak one) could produce magnetorotational supernova explosion.For the simulations we have used 2D numerical scheme, based on the specially developed numerical method (conservative, implicit, triangular grid, Lagrangian, grid reconstruction).

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