POLARIZED PARTIAL FREQUENCY REDISTRIBUTION IN SUBORDINATE LINES. II. SOLUTION OF THE TRANSFER EQUATION WITH RAYLEIGH SCATTERING

It is quite common in line formation theory to treat scattering in subordinate lines under the assumption of complete frequency redistribution (CRD). The partial frequency redistribution (PRD) in subordinate lines cannot always be approximated by CRD, especially when the polarization state of the li...

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Vydáno v:The Astrophysical journal Ročník 757; číslo 1; s. 33 - 10
Hlavní autoři: Nagendra, K. N., Sampoorna, M.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Bristol IOP 20.09.2012
Témata:
Approximation
APPROXIMATIONS
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Atmospheres
ATOM COLLISIONS
ATOMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Earth, ocean, space
Exact sciences and technology
Formations
Linear polarization
LTE
MAIN SEQUENCE STARS
Mathematical analysis
Mathematical models
MATHEMATICAL SOLUTIONS
MATRICES
ONE-DIMENSIONAL CALCULATIONS
PLANETARY ATMOSPHERES
POLARIZATION
RADIANT HEAT TRANSFER
RAYLEIGH SCATTERING
RESONANCE
Scattering
Rayleigh scattering
Two level atom
Approximate method
Line shape
Atmosphere model
Line formation
Transfer equation
Sun
Non-LTE
Resonance line
Sun: atmosphere
Magnetic scattering
scattering
line: profiles
Linear polarization
Radiative transfer
polarization
Iterative methods
ISSN:0004-637X, 1538-4357
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Popis
Shrnutí:It is quite common in line formation theory to treat scattering in subordinate lines under the assumption of complete frequency redistribution (CRD). The partial frequency redistribution (PRD) in subordinate lines cannot always be approximated by CRD, especially when the polarization state of the line radiation is taken into account. Here we investigate the PRD effects in subordinate lines including scattering polarization. The line formation is described by a polarized non-LTE line transfer equation based on a two-level atom model. We use the recently derived subordinate line redistribution matrix. We devise polarized approximate lambda iteration methods to solve the concerned transfer problem. The linear polarization profiles of subordinate lines formed in non-magnetic (Rayleigh) scattering atmospheres are discussed. We consider one-dimensional isothermal planar model atmospheres. We show that in the polarized line transfer calculations of subordinate lines, PRD plays as important of a role as it does in the case of resonance lines. We also study the effect of collisions on linear polarization profiles of subordinate lines.
Bibliografie:ObjectType-Article-1
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content type line 23
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/757/1/33