Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345..319g&link_type=abstract
In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 319-325 (SEE N85-15539 06-90)
Astronomy and Astrophysics
Astronomy
1
Gas Dynamics, Interstellar Gas, Kinematics, Line Of Sight, Solar Wind Velocity, Taylor Series, Velocity Distribution, Astronomical Models, B Stars, Giant Stars, Interstellar Matter, K Stars
Scientific paper
The kinematic properties of gas and stars in the solar neighborhood are described in terms of the line of sight component of a three dimensional first order Taylor series expansion of the local velocity field. The types of object analyzed are: (1) 21 cm absorbing clouds; (2) intercloud medium; (3) main sequence B-stars closer than 200 pc; (4) B-stars of luminosity class ranging from I to IV; (5) main sequence A stars; (6) K-giant stars. The least squares fitting procedure used to derive the 10 coefficients describes each of the six velocity fields was essentially the same for comparison. Marked departures from circular motion are found in most cases, but the only systematic trend is a correlation between delta u/delta x and stellar spectral type, where the gas behaves like a medium younger than the early type stars. It is indicated that the standard plane-parallel model provides a good description for the intercloud medium, but is inadequate for the absorbing clouds. A velocity ellipsoid description of the residuals is presented for each type of object. The influence of the Gould belt on local kinematics is discussed.
Goulet T.
Shuter William L. H.
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