PH224 ASTRONOMY B:
STELLAR AND GALACTIC ASTRONOMY

1999 November 8.
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Subject coordinator: Dr. J. E. Ross, room 2.26 Physics Annexe (53429).

Best time to catch me in my office: Mon, Wed, Thu before 11am.

Assumed background:High school physics or #8 of any university level Physics or Mathematics.

Teaching mode: Thirty-nine contact hours. Tutorial problems may be set and worked during any session as appropriate. Students are expected to bring a calculater each session. Three of the hours may be set aside for observing sessions.

Resource materials: The lectures are based on Abell's Exploration Of The Universe. Any edition or any book with the same call number can be used. A planisphere (available in the book store) might prove useful for spotting stars and constellations. The SKYGLOBE (DOS) planetarium program is recommended.

You can download skyglb36.zip the shareware version of skyglobe but for a measley $US20 you can get the full blown version of SKYGLOBE like I have. It's worth it and you feel good too!

Assessment: The award is based on a two hour final (100 multiple choice) and optional one hour (50 multiple choice) midterm examination. The optional midterm will only count if it improves the %. There is no penalty for guessing an answer, but I give a quarter mark if no answer is given. I award a "4" if 50% is achieved. The result may be expressed as %=maximum(final marks, (final marks+midterm marks)/1.5).


Some old exams with spoilers:
PH224 1996 Final
PH224 1997 Final--Part 1
PH224 1997 Final--part 2
1998 Mid semester practice exam.
NEW!!!1998 Final exam.

Need the formula sheet?

Goal: PH224 introduces the student to the wonders of the universe that lie beyond the solar system. The student is expected to:
(i) Gain an understanding of the basic properties of stars, the interstellar medium, our Milky Way galaxy, and galaxies in general.
(ii) Be able to perform certain simple calculations (eg law of magnitudes, Kepler's harmonic law, tides go as M/R3, redshift law, mass-luminosity relation, effective temperature),
(iii) Identify a number of objects in the sky (constellations, stars, star clusters, nebulae), and
(iv) be surprised by a goal not yet suspected... Something new is always turning up in this field. For a more specific set of goals see the detailed syllabus below.
PH224 ASTRONOMY B: DETAILED SYLLABUS
1. FUNDAMENTAL DATA: STELLAR DISTANCES
The baseline: distances in the solar system, the AU. Direct measurement of distances to the nearest stars (annual parallax), definition of the parsec.
2. THE LOCAL NEIGHBOURHOOD
Stellar motions, motions of the sun and stars, secular and statistical parallax, moving cluster parallax.
3. STELLAR COLOURS AND MAGNITUDES
Apparent brightness and colours of stars. Apparent magnitudes, colour systems (UBVRI, ubvy). Variable stars.
4. SPECTRAL ANALYSIS
The spectroscope, atomic energy levels, spectrum analysis, classification of stellar spectra (OBAFGKMRNS), stellar photospheres.
5. BINARY STARS
Double stars: determination of stellar masses and radii. The mass of the sun. Dynamical parallax.
6. PROPERTIES OF STARS WITHIN FIFTY PARSECS
Typical stars, the mass-luminosity relation, the Hertzsprung-Russel (HR) diagram, main sequence (MS), spectroscopic parallax.
7. THE INTERSTELLAR MEDIUM
Interstellar gas and dust: composition, distribution, gas and dust clouds, giant molecular complexes (GMCs).
8. STELLAR FORMATION AND EVOLUTION
The Virial theorem,
pre main sequence evolution and lower limit to the main sequence,
Stellar structure and models,
nuclear energy sources, the PP chains, the CNO cycle,
Evolution away from the zero age main sequence
white dwarf star ashes.
The later stages of stellar evolution, helium burning, red giants.
***1999 NEW*** The first and second dredge-ups, Wolf-Rayet stars.
Supernovae
9. OBSERVATIONAL EVIDENCE
Star clusters: Globular clusters, galactic clusters, cluster ages (MS turnoff), cluster dynamics.
Protostars in GMC's.
10. OUR SUN
The outer layers: photosphere, chromosphere, corona, the solar wind. Comparison with other stars. The solar interior, neutrino astronomy.
11. GENERAL RELATIVITY
Flat spacetime, principle of equivalence, curved spacetime, tests of the theory, black holes, gravitational radiation.
12. THE MILKY WAY GALAXY
General properties: the "great debate", (Spiral) structure, rotation, mass, nucleus, disk, halo, globular clusters, population types.
13. GALAXIES
Types and properties,
The distance scale,
Hubble's distance-redshift law and the expanding universe,
Active galactic nuclei: Quasars, BL Lac, N, Seyfert galaxies.
14. THE UNIVERSE
Distribution of galaxies: Clusters and superclusters or froth? Formation and evolution of galaxies.
15. COSMOLOGY
Cosmological models: Cosmological principles, steady state, big bang models. Evolution after 10-35s in the standard (big bang) model: Formation of the elements, cosmic background radiation.
The age of things at redshift z.
The three families of quarks and leptons.
Problems with the standard model, the inflationary universe.