Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.1894d&link_type=abstract
Astronomical Journal v.110, p.1894
Astronomy and Astrophysics
Astronomy
2
Shock Waves, Accretion
Scientific paper
We analyze the stability of radiative shock waves of expanding (diverging) flows. Such flow structures develop when a fast wind from a central object expands against a denser and slower medium. The fast wind's material passes through a shock wave, and then cools and decelerates. We semianalytically study the stability of the fundamental and first overtone radial modes, for spherically symmetric flows, assuming power law cooling functions. We find that radiative shocks of diverging flows get more stable as the deviation from planarity increases. We apply the results to protoplanetary nebulae, and find that the overstability is likely to be effective during a period of ˜300 yr, when the central star wind's velocity increases from ˜150 to ˜300 km s-1. The instability can reveal itself via semiperiodic variation of some emissions lines, with semiperiods of few × 10 yr, and, if nonradial modes are overstable, in the development of clumps. Our results further stress the necessity of accurately incorporating the evolution with time of the wind and radiation from the central star when modeling planetary nebulae formation.
Cadavid Martha Lucia
Dgani Ruth
Soker Noam
No associations
LandOfFree
The Colliding Winds Overstability 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 The Colliding Winds Overstability, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Colliding Winds Overstability will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1352178