Statistics – Computation
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..841f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 841-847.
Statistics
Computation
4
Cooling Flows (Astrophysics), H Ii Regions, Hydrodynamic Equations, Ionized Gases, Planetary Nebulae, Stellar Winds, Computational Astrophysics, Forbidden Bands, Stellar Mass Ejection, Stellar Spectra
Scientific paper
The calculation of ionized nonisothermal steady supersonic stellar winds is reported. It is argued that for nebulae created by the outflow of winds from a central star, mechanical cooling can dominate the energy budget, much as is the case for supernovae. It is shown that for reasonable mass loss rates (not greater than 10 exp -7 solar mass/yr), the mechanical cooling due to expansion can cause the temperature in the wind to drop dramatically. It is suggested that the cooling due to expansion is both observationally testable and significant. In cases where high excitation lines and nebular forbidden lines are remarkably weak (i.e., Sharpless 266), evidence of outflow velocities of approximately 20 km/s may be indicated.
Balick Bruce
Frank Adam
Noriega-Crespo Alberto
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