Stochastic shock waves as a candidate mechanism for the formation of the He I 10830-A line in cool giant stars

1990 ◽  
Vol 353 ◽  
pp. L39 ◽  
Author(s):  
Manfred Cuntz ◽  
Donald G. Luttermoser
Keyword(s):  
Shock Waves ◽  
Giant Stars

scholarly journals Photospheric Models for Cool Giant Stars

1989 ◽  
Vol 106 ◽  
pp. 67-80
Author(s):  
M.S. Bessell ◽  
M. Scholz
Keyword(s):  
Shock Waves ◽  
Variable Stars ◽  
Polyatomic Molecules ◽  
State Equations ◽  
Giant Stars ◽  
Plane Parallel ◽  
Mira Variable ◽  
M Stars ◽  
Parallel Approximation

AbstractModels for M and C giant stars differ from those for hotter stars by having complicated state equations and opacities dominated by lines from diatomic and polyatomic molecules. In addition many cool giants have atmospheres which are extended, and which cannot therefore be adequately modelled using a plane-parallel approximation. Mira variable stars have atmospheres which are even more extended due to the regular passage of shock waves through their atmosphere. In this review we will discuss recent modelling of such atmospheres and show comparisons with observations of variable and non-variable M stars.

Surface Brightness Scale of Galactic Cepheids

1999 ◽  
Vol 190 ◽  
pp. 561-562
Author(s):  
G. P. Di Benedetto
Keyword(s):  
Surface Brightness ◽  
Variable Stars ◽  
Giant Stars ◽  
Near Ir

An accurate calibration of the surface brightness scaleSVas a function of the near-IR color (V–K) has been recently measured for non-variable Galactic dwarf and giant stars. It can be shown that this correlation can be applied to theSVscale of Galactic Cepheid variable stars, which are of major cosmological interest.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

Shock waves and the heterogeneity of materials

2006 ◽  
Vol 134 ◽  
pp. 237-241
Author(s):  
J. L. Dequiedt
Keyword(s):  
Shock Waves

Ionization relaxation behind strong shock waves in gases

1970 ◽  
Vol 102 (11) ◽  
pp. 431-462 ◽  
Author(s):  
L.M. Biberman ◽  
A.Kh. Mnatsakanyan ◽  
I.T. Yakubov
Keyword(s):  
Shock Waves ◽  
Strong Shock ◽  
Strong Shock Waves

Shock waves in magnetohydrodynamics

1960 ◽  
Vol 72 (9) ◽  
pp. 33-52 ◽  
Author(s):  
R.V. Polovin
Keyword(s):  
Shock Waves
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