Outline for Lecture 1: Course goals Course topics - any extra? Course structure - lectures - optional workshops – topics Course grading - homeworks - journal discussion - course project (breakdown) - grade division – vote Course schedule - Lectures & workshops – fine-tune workshop schedule - Known missing days and make-up classes – identify - Other important events – CASS seminar & journal club QUESTIONS Context Important patterns - distribution of stars & gas in MW, other galaxies (including kinematics) - brightnesses & colors – HR diagram - chemical abundance patterns - other star related stuff – supernovae (types), planetary nebulae, SNR What we know from Sun - apparent size -> actual size from AU measurement from Venus orbit - mass (or GM) from planetary orbits, later GR effects - temperature & composition – from spectroscopy, indicates primarily plasma - luminosity – from solar constant, distance - average density - estimate core => must be gas - interior pressure – hydrostatic equilibrium - interior temperature – nonrelativistic plasma - spot patterns – rotation, B-field - helioseismology – internal structure, energy transport, rotational structure - other – neutrino emission, abundance patterns relative to planets, planets themselves give important information (age!) Scaling up via HR diagram - absolute brightness (typically V & parallax needed) -> luminosity -> 4πR2sT4 - color & spectrum -> T => R (lines of constant radius) o interesting outliers – supergiants, white dwarfs - star counts – age in region (high density = long phase) - different HR diagrams for different systems – time, composition are factors - asteroseismology – Kepler can now do this for many stars
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Outline for Lecture 1: Course goals - Cool Star Labpono.ucsd.edu/~adam/teaching/phys223/lectures/lecture1.pdf · Outline for Lecture 1: Course goals Course topics - any extra? Course
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o interestingoutliers–supergiants,whitedwarfs- starcounts–ageinregion(highdensity=longphase)- differentHRdiagramsfordifferentsystems–time,compositionarefactors- asteroseismology–Keplercannowdothisformanystars