|Module Title||STARS AND GALAXIES|
|Co-ordinator||Dr Nicholas Mitchell|
|Other staff||Dr Andrew Breen, Dr Geraint Vaughan|
|Pre-Requisite||PH11010 , PH12010 , PH13010 , PH14010 , PH15010 , PH16010|
|Course delivery||Lecture||20 lectures|
|Assessment||Exam||End of semester examinations||70%|
|Course work||Example Sheets Coursework Deadlines (by week of semester): Example Sheets 1,2, and 5 Weeks 2,3 & 6 Example Sheets 6,7 and 10 Weeks 7,8 and 11||30%|
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:
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
** Supplementary Text
Smith. Observational Astrophysics. Cambridge University Press
Zeilik & Gregory. Introductory Astronomy & AstroPhysics. 4th. Saunders College Publishing