Stellar atmospheres (PHY305) is a compulsory firstsemester halfmodule course for third year undergraduates taking dualhonours Astronomy with Physics or Mathematics. PHY305 has been running since 200304 with extra elements on the Solar atmosphere added in 200708 once the level 2 `Sun & Moon' module was laid to rest. For each past paper, you'll need a formulae sheet (in nasty S.I. units). There will be a revision lecture to go through specific examples from last year's paper on Tue 26 Jan in LTD at noon.
Aims and Objectives
This course aims to describe how astronomers obtain information about the properties of stars from their atmospheres. On completion of this halfmodule you should be able to understand how the interaction of radiation with matter affects the appearance of a stellar atmosphere, including the major sources of opacity. You will have a knowledge of the formation of spectral lines, line broadening mechanisms, plus an appreciation of the use of stellar continua and lines as atmospheric diagnostics. Details of course objectives are given here (pdf), while an outline syllabus is provided here (pdf).
Assessment
Two continuous assessment problem sheets each contribute 7.5% of the course ( HW1 due Mon 16 Nov 2015 at 4pm, ( HW2, due Mon 14 Dec 2015 at 4pm) while a final 2 hour exam contributes the remaining 85%.
Text Books
Introduction to Stellar Astrophysics, Vol 2, E. BohmVitense, 1989 (CUP)
Observation and Analysis of Stellar Photospheres (3rd Ed)., D. Gray, 2005 (CUP)
Theory of Stellar Atmospheres, I. Hubeny and D. Mihalas, 2015 (Princeton)
For further reading on spectral classification, you are referred to:
Stars and their spectra, J.B. Kaler, 1997 (CUP)
For further reading on spectral winds, you are referred to:
Introduction to Stellar Winds, H. Lamers and J. Cassinelli, 1999 (CUP)
Week Mon (11:00 LTB)
Thu (10:00 LTD)
Thu (13:00 E36)
wk1. Sep 28
PHY3051 Outline PDF
PHY3052 Stars & spectra PDF
wk2. Oct 05  
wk3. Oct 12 PHY3053 Magnitudes, fluxes
PDF
PHY3054 SahaBoltzmann
PDF

wk4. Oct 19 PHY3055 Saha Eqn, Rad. terms
PDF
PHY3056 Rad. Transfer
PDF
PHY3057 Rad. Transfer
PDF
wk5. Oct 26 
PHY3058 Limb Darkening
PDF
PHY3059 Radiative Equil.
PDF
wk6. Nov 2 PHY30510 Opacity
PDF
PHY30511 More Opacity
PDF
PHY30512 Temperature
PDF
wk7. Nov 9 Reading Week Reading Week Reading Week
wk8. Nov 16 PHY30513 Pressure
PDF
PHY30514 Pressure Broad.
PDF

wk9. Nov 23 PHY30515 Thermal Broad. CoG
PDF
PHY30516 Abundances/nonLTE
PDF

wk10. Nov 30 PHY30517 Solar corona
PDF
PHY30518 Cool star winds
PDF

wk11. Dec 7 PHY30519 Hot star winds
PDF
PHY30520 Dense Outflows/BDs
PDF

Students unfamiliar with the notation used in atomic spectroscopy may wish to consult the National Institute of Standards and Technology (NIST) document Atomic Spectroscopy which summarises basic ideas of notation and allowed/forbidden selection rules.
For background details on interferometry, see handouts on CHARA array. Videos focused on the solar chromosphere and corona include: Solar granulation (Big Bear Solar Observatory), Solar Prominence (Solar Dynamics Observatory), CMEs (SOHO), The Solar cycle (NASA).
6Dec2015Paul.Crowther@sheffield.ac.uk