Module Details

The information contained in this module specification was correct at the time of publication but may be subject to change, either during the session because of unforeseen circumstances, or following review of the module at the end of the session. Queries about the module should be directed to the member of staff with responsibility for the module.
Title STELLAR ATMOSPHERES
Code PHYS352
Coordinator Prof P Mazzali
Physics
P.Mazzali@liverpool.ac.uk
Year CATS Level Semester CATS Value
Session 2021-22 Level 6 FHEQ Second Semester 7.5

Aims

To provide students with an understanding of the properties of the light  emitted by stars, of the effect of expanding atmospheres and of the  relevance for Supernovae. To enable students to determine the basic phy sical properties of stars  from observational data (e.g. Temp, Radius, Mass, composition) and the  properties of expanding media (stellar winds: velocity, mass-loss rate;  Supernovae: velocity, mass, kinetic energy, nucleosynthesis)


Learning Outcomes

(LO1) Knowledge of how the physical properties of stars and supernovae can be determined from spectroscopic observations.

(LO2) An understanding of how the interaction between radiation and matter determines the observable properties of stars.

(LO3) An understanding of how radiation propagates through a medium (a gas), affecting its properties

(S1) Problem solving skills

(S2) Analytic skills applied to stellar atmospheres


Syllabus

 

Introduction & Observables Herzsprung-Russell diagram. Observables: Luminosity, colour,  temperature. Measurement of stellar parameters (mass, radius,  luminosity) and interrelations.  Transport of energy: Radiation Definition of Radiation quantitites. Optical depth, absorption and  emission. Equation of Transfer. Formal solution. Limb darkening.  Temperature distribution. Grey atmosphere. Main sources of opacity. Atomic Processes Atomic processes relevant for stellar spectra. Interaction of radiation  and matter. Continuum and line processes. Einstein coefficients for  absorption. Oscillator strength. Line profile, broadening. Continuum  absorption. Scattering. Stellar Spectra Excitation, Ionization. Saha-Boltzmann equation. Stellar spectra,  classification. Line Transfer 2-level atom. Milne relations. Curve of Growth. Stellar Winds Radiation Pressure. Mass-loss in hot stars. Diagnostics of wind s. Line  formation in expanding atmospheres. Sobolev Approximation. Radiation  transport in moving media. Supernovae Observational classification. Underlying physical mechanisms  (thermonucler explosion, core collapse). Montecarlo radiation transport.  Derivation of SN properties. Application to Cosmology.


Teaching and Learning Strategies

Teaching Method 1 - Lecture
Description: Lecture to class on all topics covered in course
Attendance Recorded: Yes

Teaching Method 2 - Tutorial
Description: Weekly tutorials to discuss and return homework, any other questions students might have
Attendance Recorded: Yes
Notes: This activity provides students a chance to test their knowledge and prepare for the final exam


Teaching Schedule

  Lectures Seminars Tutorials Lab Practicals Fieldwork Placement Other TOTAL
Study Hours 18

  6

      24
Timetable (if known)              
Private Study 51
TOTAL HOURS 75

Assessment

EXAM Duration Timing
(Semester)
% of
final
mark
Resit/resubmission
opportunity
Penalty for late
submission
Notes
Assessment 2 Standard UoL penalty applies for late submission. This is an anonymous assessment. Assessment Schedule (When) :2  1.5 hours    80       
CONTINUOUS Duration Timing
(Semester)
% of
final
mark
Resit/resubmission
opportunity
Penalty for late
submission
Notes
Assessment 1 Non-standard penalty applies for late submission - Homework cannot be returned after it has been discussed in tutorial This is not an anonymous assessment. Assessment Schedule (When)  Homework problems fo    20       

Recommended Texts

Reading lists are managed at readinglists.liverpool.ac.uk. Click here to access the reading lists for this module.