Albedo problem for finite plane-parallel medium

2002 ◽  
Vol 72 (4) ◽  
pp. 449-465 ◽  
Author(s):  
A.R. Degheidy ◽  
M.H. Haggag ◽  
A. El-Depsy
Keyword(s):  
Finite Plane ◽  
Plane Parallel ◽  
Albedo Problem

scholarly journals Si II Lines in the Shell of ζ Tau

1976 ◽  
Vol 70 ◽  
pp. 315-320
Author(s):  
Sara R. Heap
Keyword(s):  
Thick Disk ◽  
Be Stars ◽  
Finite Plane ◽  
Plane Parallel ◽  
Realistic Geometry

Non-LTE strengths of Si II lines were computed in an effort to reproduce the observed strengths of Si II lines in the shell spectrum of ζ Tau. This effort was unsuccessful, probably because it assumed that the shell could be represented by a finite, plane-parallel slab. The main conclusion of this study, then, is that in order to understand the shell spectra of Be stars, a more realistic geometry must be assumed, in which the shell is represented by a thick disk.

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