Hydrodynamic Equations of Differentially Rotating Stellar Systems and the Velocity Ellipsoid

Details Hydrodynamic Equations of Differentially Rotating Stellar Systems and the Velocity Ellipsoid Hydrodynamic Equations of Differentially Rotating Stellar Systems and the Velocity Ellipsoid

Aug 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968ap%26ss...2...37k&link_type=abstract

Astrophysics and Space Science, Volume 2, Issue 1, pp.37-47

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

Anisotropic hydrodynamic equations for differentially rotating collisionless stellar systems are derived. These equations can describe the evolution of the systems in a time span longer than their rotation periods. As a by-product of derivation of hydrodynamic equations, the well-known relation that the ratio of the principal axes of the velocity ellipse in a differentially rotating stellar disk is [B/(B-A)]1/2 is re-found if the system is in a purely circular rotation, whereA andB are the Oort's constants. In addition, we find a systematic mean motion superposed on a purely circular differential rotation makes the directions of axes of the velocity ellipse deviate from the radial and the transverse direction. The observed deviation of directions of axes in our neighbourhood in the Galaxy can be explained if in the mean motion superposed on a purely circular differential rotatin the ‘gas’ of stars near us is compressed in the radial direction or rarefied in the transverse directions, with irregularities of the order of 5 km/sec in amplitude of velocity and 1 kpc in size. These magnitudes of irregularities agree with those actually observed or with those anticipated from other theoretical considerations.

Affiliated with

Also associated with

No associations

Rating

Hydrodynamic Equations of Differentially Rotating Stellar Systems and the Velocity Ellipsoid 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 Equations of Differentially Rotating Stellar Systems and the Velocity Ellipsoid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrodynamic Equations of Differentially Rotating Stellar Systems and the Velocity Ellipsoid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1565778