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Theoretical Astrophysics

PROGRAM of

'Theoretical Astrophysics'

Forth Year


Introduction

  • Subject, Problems and Objects of Theoretical Astrophysics. Photons Frequency Function. Boltzmann Equation for Photones. Characteristics of Radiation Field and Ratio between Them. Macroscopic Transport Equation. Absorption Coefficient and Emittance. Radiation Transport Equation, Its Solution. Partial Cases, Which Can Be Solved Analytically. Case of Thermodynamic Equilibrium. Local Thermodynamic Equilibrium and Conditions of Their Application. Polarization of Radiation. Density Matrix and Stokes Parameters. Polarised Radiation Transport. System of Transport Equation for Stokes Parameters.

Theory of Stellar Photospheres

  • Stellar Photospheres, Their Features. Theory of Stellar Photosphere Basic Problems. Geometric Models of Photosphere. Flux of Radiation in Thin and Lengsly Photospheres. Hypothesis of Grey Matter. Basic Conceptions and Equations of Thin Photosphere Theory. Boundary Conditions. Methods of Solution of Basic System of Equations. Schwarzschild-Schuster Approximation. Temperature Distribution with Optical Depth. Brightness Disc Distribution in Integral and Monochromatics Light. Energy Distribution in Uninterrupted Light in Approximation of Gray Matter, Comparison with Observation Results.
  • Physics of Continuous Radiation Absorption in Stellar Photospheres. Photoionization and Free-Free Transitions. Volumetrica Absorption Coefficient for Hydrogen-like Atom. Absorption by Negative Hydrogen Iones. Light Dispersion on Free Electrons. Other Mechanismes of Light Absorption and Dispersion in Stellar Atmospheres. Mean Absorption Coefficient. Methods of Its Calculation.
  • Continuous Radiation Absorption in Stellar Photospheres of Various Spectral Classes. Solar Type Photospheres. Photospheres of Sp A0-B2 Stars. Photosphere Structure Problem in General Case. Hydrostatic Equilibrium Condition. Significance of Radiation Pressure in Stellar Photospheres of Various Sp Classes. Calculation of Photosphere Model. Empirical Photospheres Models.
  • Basic Conceptions and Equations of Lengthy Photosphere Theory. Conclusions from Lengthy Photosphere Theory.

Absorption Lines in Stellar Spectrums

  • Characterisics of Absorption Lines. True Absorption and Pure Radiation Scattering in Stellar Atmospheres. Problem of Incoherent Scattering. Rotating Sphere Approximation. Theory of Absorption Lines Formation According to Schwarzschild-Schuster Model.
  • Line Absorption Coefficient. Nature Broadening of Lines Extinction. Doppler Broadening. Lines Characteristics in Cases of Effect of Radiation Extinction or Doppler Broadening. Convolution of Contours. Absorption Coefficient in Joint Action of Doppler Broadening and Radiation Extinction.
  • Other Mechanismes of Lines Broadening. Mechanismes, Which Change Equivalent Widthes (Microturbulence, Pressure Effects,Isotope Shifts, Ultrafine Structure, Zeeman Effect). Mechanismes, Which Change Contoures without Equivalent Widthes Changing (Macroturbulence, Stellar Rotation, Pulsations).
  • Equivalent Widthes of Absorption Lines in Stellar Spectrums and Their Dependence on Absorbing Particles Number. Method of Increase Curves, Its Potentialities and Procedures of Realization. Empirical Increase Curves. Chemical Structure of Stellar Atmospheres. Solar and Stellar Forces of Oscillators.
  • Contoures of Absorption Lines in Stellar Spectrums. Problem of Central Intensity. Noncoherence of Scattering. Stellar Magnetic Fields.
  • Physical Explanation of Spectral Classification of Stars. Temperature Dependence of Spectral Classe. Scale of Ionization Temperatures. Influence of Attraction in Atmosphere on Stellar Spectrum. Effects of Absolute Value.

Radiation Lines in Stellar Spectrums

  • Stars of Early Spectral Classes with Emission Lines (WR, P Cyg, Be). Dilution of Radiation. Fluorescence in Lengthy Atmospheres. Rosseland Theorem. Conditions of Emission Lines Beginnings. Recombination Excitation, Population of Level. Level Stationarity Equation. Number of Recombinations. Intensity of Emission Lines.
  • Line Contours of P Cyg Type. Theory of Spectral Lines Contour for Stars with Lengthy Moving Envelopes. Mass Loss of WR, P Cyg, Be Stars.
  • Stars of Later Spectral Classes with Emission Lines. Shocks in Stellar Atmospheres. Coservation Equation. Parameters Jumps on Pressure Front. Influence of Ionization and Radiation on Parameters Jumps. Magnetohydrodynamic Shocks. Classification of Breaks. Irregular Long-period Variables. Features of Spectrums, Interpretation.

Forbidden Lines in Spectrums of Astronomical Objects

  • Conditions of Intensity Beginning. Excitation of Metastable States by Radiation and Electron Blow. Determination of Te According to Intensity of Forbidden Lines of Shock Excitation.

Physics of Nebulae and Interstellar Medium

  • Interstellar Absorption Lines, Their Features. Interpretation of Contours, Equivalent Widthes. Physical and Dynamic Features of Interstellar Medium, Which Follows from Observations of Interstellar Absorption Lines. Chemical Structure of Interstellar Medium.
  • Diffuse and Planetary Nebulae, Features and Physical Conditions inside Them. Nature of Radiation in Resolved Peak. Balmer Decrement. Method of Planetary Nebulae Nucleus Temperature Determination. Forbidden Lines in Spectrums of Planetary Nebulae. Method of Nebulium, Its Modernisation by Sobolev. Electron Temperatures of Nebulae. Distribution of Electron Concentration in Planetary Nebulae. Ionization Equilibrium of Hydrogen and Other Elements in Planetary Nebulae. Is Radiation Field. La Radiation Field. Problem of Planetary Nebulae Dynamics. Features and Nature of Planetary Nebulae Continuous Spectrum.
  • Ionization of Hydrogen and Other Elements in Interstellar Medium. Ionization Velocity. HII Zones, Physical Features, Demension. Ionization Fronts. Thermal Radiation of HВВ Zones and Emission Nebulae. HВ Zones; Problem of Electron Concentration and Temperature.
  • Reflectiv Nebulae. Dispersion and Transportation of Radiation in Nebula. Albedo, Speck of Dust Dispersion Indicatrix. Statistical Tecniques of Absorbing Clouds Investigation. Theory of Milky Way Surface Brightness Fluctation.Parameters of Absorbing Clouds. Interstellar Light Polarization; Its Features, Nature. Mechanismes of Specks of Dust Orientation in Interstellar Medium. Physical-Chemical Features of Specks of Dust in Interstellar Medium.

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