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Radiation transport in spectral lines.

Author: R Grant Athay
Publisher: Dordrecht, Reidel [1972]
Series: Geophysics and astrophysics monographs, v. 1.
Edition/Format:   Print book : EnglishView all editions and formats
Summary:

The usual book on the theory of spectral line formation begins with an in-depth dis- cussion of radiation transfer, including the elegant methods of obtaining analytical solutions for special cases,  Read more...

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Document Type: Book
All Authors / Contributors: R Grant Athay
ISBN: 9027702284 9789027702289 9027702411 9789027702418
OCLC Number: 589706
Description: xiii, 263 pages 25 cm.
Contents: I. Introduction.- 1. Historical Summary.- 2. Radiative Transfer Equations.- 3. Local Thermodynamic Equilibrium.- 4. Pure Scattering.- II. The Line Source Function.- 1. The General Form of SL.- 2. Steady State Equations.- 3. Specific Form of SL.- 4. An Integral Form for SL.- 5. The Form of ?? and the Escape Probability.- 6. The Destruction Probability.- 7. Photon Random Walk, Degradation Length and Thermalization Length.- 8. Effectively Thick and Effectively Thin.- 9. The Escape Coefficient.- 10. Rate Coefficients.- 11. Free-Bound Continua.- III. The Two-Level Case: One Spectral Line.- 1. ?, r0, ??, and B Constant.- 2. The Influence of a Temperature Gradient.- 3. The Influence of a Gradient in ?.- 4. The Influence of a Gradient in r0.- 5. The Influence of a Gradient in ??.- 6. The Influence of a Moving Atmosphere.- 7. The Influence of Frequency Redistribution.- 8. The Influence of Anisotropic Scattering.- 9. The Influence of a Finite Atmosphere.- 10. The Influence of Horizontal Structure.- a. Periodic Structure.- b. The Isolated Cylinder.- c. The Imbedded Cylinder.- IV. The Multilevel Case: Two or More Lines.- 1. General Comments.- 2. Consistency Checks.- 3. Two Levels Plus Continuum.- 4. Upper Level Multiplets.- 5. Lower Level Multiplets.- 6. Metastable Levels.- 7. Two Lines in Series.- 8. Three Line Loops.- 9. Four-Line Metastable Loops.- 10. Four-Line Closed Loop.- 11. Interlocking Effects on a Strong Line of Fixed ?, r0 and ?.- 12. Discussion.- V. Line profiles.- 1. The Eddington-Barbier Relation.- 2. Depth Dependence of S? Near Line Center.- 3. Frequency Dependence of S?.- 4. Mapping of S? into I?.- 5. Microturbulence, Macroturbulence, and Differential Motion.- 6. Line Cores.- 7. Line Wings.- 8. Center-Limb Effects.- 9. Profile Synthesis.- 10. A Standard Set of Data.- 11. Evaluation of ??D from Cores of Strong Lines - One ? Position.- 12. Evaluation of ??D from Cores of Strong Lines - Center-Limb Data.- 13. Analysis of Line Wings.- 14. Analysis of Line Shoulders.- 15. Comments on Weak and Moderately Strong (Photospheric) Lines.- 16. A Test for LTE Using Equivalent Widths.- 17. Comparisons of Empirically Derived Line Source Functions to the Continuum Source Function.- 18. Analysis and Restoration of Line Profile Data.- VI. Total Intensities of Lines.- 1. Introduction.- 2. Curve-of-Growth for Absorption Lines.- 3. Emission Line Fluxes.- 4. The Two Level Atom.- 5. Upper Level Doublets.- 6. Lower Level Doublet and Metastable Level.- 7. Three Line Loop.- 8. Added Comments.- VII. The Line Blanketing Effect.- 1. Definition of Terms.- 2. Historical Summary.- 3. Mathematical Derivation of Blanketing Terms.- 4. The c Term.- 5. The t Term.- 6. Integrated Quantities.- 7. Influence on Temperature Structure.- 8. Multilevel Effects.- 9. Early Stellar Types.- 10. The Solar Case.- 11. The Cayrel Mechanism.- VIII. Numerical Methods.- 1. Introduction.- 2. The Integral Flux-Divergence Equations.- 3. Required Frequency Bandwidth.- 4. Frequency Mapping.- 5. Free-Bound Continua.- 6. Simultaneous Solution of the Integral Flux-Divergence Equations.- 7. A Differential Equation Method.- 8. Extension to the Multilevel Case and Linearization.- 9. Core Saturation Method.- Index of Subjects.
Series Title: Geophysics and astrophysics monographs, v. 1.
Responsibility: By R. Grant Athay.

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