|| PH28010 |
|| STARS AND GALAXIES |
|| 2001/2002 |
|| Dr Nicholas Mitchell |
|| Semester 1 |
|| Dr Andrew Breen, Professor Shadia Habbal |
|| Part 1 core modules |
| Course delivery
|| Lecture || 20 lectures |
|| Course work || Example Sheets Example Sheets 1,2,5,6,7 & 10
Deadlines are detailed in the Year 2 Example Sheet Schedule distributed by the Department || 30% |
|| Exam || 2 Hours End of semester examinations || 70% |
This module considers the physics of stars and galaxies. Starting with a review of celestial co-ordinate systems, the stellar radiation laws and the various star classification schemes used in astronomy, the module describes the methods used to determine the distance of stars and hence their luminosity, radii and mass. A description of the Herzspring-Russell diagram illustrates an account of the physical processes involved in stellar formation and evolution, leading to the end-states of white dwarfs, neutron stars and black holes. The physical properties, structure and morphology of the galaxies are studied. The subject of galactic dynamics is introduced.
After taking this module students should be able to:
understand the basic features of observational astronomy: co-ordinate systems and magnitudes.
expalin the physical processes whereby a section of the ISM collapses to a star.
understand the nature of the final states of stars.
understand the appearance, classification and simple physics of galactic systems.
Coordinate systems. Magnitudes and Brightness. Absolute and Apparent, Visual and Photometric, Bolometric Magnitudes. Stellar distances. Mass-luminosity relation. Introduction to the Hertzsprung-Russell diagram.
STAR FORMATION AND MAIN SEQUENCE
Interstellar medium. Conditions for gravitational collapse of a molecular cloud. Free fall time, hydrostatic equilibrium. The virial theorem, protostar temperatures, complications beyond the simple theory. Observations of star formation, T-Tauri stars. Entry to the Main Sequence. Energy sources in stars. The nature of matter under stellar core conditions. Hydrogen Burning in MS stars. The CN cycle and p-p chain. Energy transport.
Post-main sequence evolution for low and high mass stars. The end states of stars: Black holes, neutron stars, white dwarfs. Supernovae, planetary nebulae.
Structure of the Galaxy: core, spiral arms, halo, clusters.
The virial equation, hidden mass. Types of galaxies: spiral, elliptical, irregular.
Active galaxies: Seyfert, quasars.
** Recommended Text
Carroll and Ostlie.
An Introduction to Modern Astrophysics. Addison Wesley 0201547309
** Supplementary Text
Observational Astrophysics. Cambridge University Press 0521260914
Zeilik & Gregory.
Introductory Astronomy & AstroPhysics. 4th. Saunders College Publishing 0471135666