Physical Processes in Gaseous Nebulae. VIII. The Ultraviolet Radiation Field and Electron Temperature of an Optically Thick Nebula.

1939 ◽  
Vol 90 ◽  
pp. 601 ◽  
Author(s):  
Lawrence H. Aller ◽  
James G. Baker ◽  
Donald H. Menzel
Keyword(s):  
Ultraviolet Radiation ◽  
Electron Temperature ◽  
Radiation Field ◽  
Physical Processes ◽  
Gaseous Nebulae

scholarly journals Physical Processes Responsible for the Removal of Circumstellar Disks

2000 ◽  
Vol 197 ◽  
pp. 403-413
Author(s):  
Doug Johnstone
Keyword(s):  
Ultraviolet Radiation ◽  
Physical State ◽  
Solar Nebula ◽  
Circumstellar Disks ◽  
Young Stars ◽  
Stellar Winds ◽  
Physical Processes ◽  
Central Source

The most likely processes responsible for the removal of circumstellar disks around young stars are reviewed with emphasis on the physical state of the disk during the period of destruction and the timescale for disk removal. Four disk dispersal mechanisms are discussed in detail: 1) viscous accretion of material onto the central source, 2) close stellar encounters, 3) stellar winds, and 4) photoevaporation by ultraviolet radiation. While viscous accretion is shown to be efficient in the inner regions of disks (r < 10 AU), photoevaporation is the principal process of disk dispersal at large radii (r > 10 AU). The commonly held view that stellar winds removed the remnant Solar Nebula is seriously questioned.

The integrated ultraviolet radiation field from QSOs

1987 ◽  
Vol 315 ◽  
pp. 180 ◽  
Author(s):  
Jill Bechtold ◽  
Ray J. Weymann ◽  
Zuo Lin ◽  
Matthew A. Malkan
Keyword(s):  
Ultraviolet Radiation ◽  
Radiation Field

scholarly journals Nature of the background ultraviolet radiation field at high redshifts

2000 ◽  
Vol 21 (1-2) ◽  
pp. 19-27 ◽  
Author(s):  
Archana Samantaray ◽  
Pushpa Khare
Keyword(s):  
Ultraviolet Radiation ◽  
Radiation Field

Physical Processes in Gaseous Nebulae. V. Electron Temperatures.

1938 ◽  
Vol 88 ◽  
pp. 422 ◽  
Author(s):  
James G. Baker ◽  
Donald H. Menzel ◽  
Lawrence H. Aller.
Keyword(s):  
Physical Processes ◽  
Gaseous Nebulae

Physical Processes in Gaseous Nebulae. XIV.

1941 ◽  
Vol 93 ◽  
pp. 236 ◽  
Author(s):  
Lawrence H. Aller
Keyword(s):  
Physical Processes ◽  
Gaseous Nebulae
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