syllabus
& course
expectations
safety,
tardy, classroom computer use, and honesty
Universe/publisher link: register as a student to use the resources
Astronomy
Picture of the Day
the
latest astrophysics discoveries
what's up in the sky
this week
| Monday, November 12 |
November 13 |
November 14 |
November 15 |
November |
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6 pm check ataglance for room you can bring and use anything in your own handwriting (notes, homework, labs) bring elementary-particle_and forces handout and green book; you may be able to use those also tutorial from 3:30 - 4:30 ; bring questions check my record of your presentations, taped to my office door |
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interstellar
matter lab will be graded by 11:30 am; please pick up (from black box outside the hallway) answers to lab questions and grading rubric are posted on my bulletin board |
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of the week |
| Monday, November 5 |
November 6 |
November 7 |
November 8 |
November 9 |
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you should finish parts
A, B, and C of the interstellar matter
lab in class
today |
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(always done before class) |
spend
30 minutes looking at the web stuff related to starbirth in the
webstuff column below in particular, look for evidence of the 4 different types of shock waves compressing interstellar clouds toward starhood (last question from last week's JIT) |
22(3)
on plnetary nebulae |
20(3) match the steps on page 27 (green book) to 1) those pictured in the starbirth summary table & 2) the figures in Chapter 20 of the text |
spend
30 - 40 minutes reading and looking at the pictures in wednesday's web
stuff on what Hubble has found about disks and jets |
20(4,5) also the pp 28 - 32, green book |
| things
you should know the answer to before coming to class |
whether your starbirth object is contracting or expanding |
what are the sources of shock waves that squeeze the clouds? what is the energy source of protostars? how long do the various phases of starbirth last and how do we know? |
why do starbirth objects end up shaped like disks? why do they produce jets? |
how long does the jet phase of starbirth last? how long does the disk phase of starbirth last? how do we know in each case? |
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homework (written assignments to be turned in) |
bring to class: see assignment emailed Saturday (11/3) just after noon: each person has been assigned a starbirth-related object..... calculations, etc., described in the email |
see lab below |
bring to class: find the formula for free-fall collapse time of an object of mass M, initial radius R using the dimensional analysis method we talked about in class (you must solve 3 equations in 3 unkowns).... then using the an initial radius of 1 light year for a sun-like cloud, calculate the free-fall time in years |
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shockwaves
star formation: star formation propagation(grav collapse induced by shock wave from O/B stellar winds) M16 before
hubble shock-wave
triggered starbirth star
death/supernova: Cygnus
loop shock wave spiral shock waves in galaxies: M51 as seen by
Hubble 2005 M83's emission nebulae
and its spiral arms a bow shock near LL Orionis the Antennae, a galaxy-galaxy collision molecular clouds & cooling molecules in space the GMC at the heart Of Orion |
how stellar
disks form
and evolve (theory in pictures) the first observations of jets and
disks during stellar
birth Stellar
Disks Set Stage for
disks without
jets: planet
building?:
Orion
Nebula
Mosaic and |
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prelab
(to be borught to class completed in your lab book) for the interstellar matter
lab |
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of the week |
comet Holmes, brightest comet visible from US in 12 years |
5
planets: a extrasolar planetary system like ours comet Holmes grows a tail maybe the dinosaurs died before the impact? |
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October 29 |
October 30 |
October 31 |
Nov 1 |
November 2 |
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(always done before class) |
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and perhaps a clue why radiation stops and convection starts in the outer layers 18(4): where are the solar neutrinos? pp. 407- 408: the search for the neutrinos, a personal viewpoint |
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| things you should know the answer to before coming to class | put
a pan of water on the stove: why does the pan not convect whereas the water does?? how can we calculate the time it takes a convection cell to travel from the bottom of the convective layer in the sun to the top surface of the sun? |
why does convection occur in the water above the pan, and not in the pan? why does convection occur in the outer parts of the sun and not the inner parts? what are the three different ways in which we are trying to detect solar neutrinos? why did it require the SNO machine to answer the question about the solar neutrinos? |
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| homework (written assignments to be turned in) |
please
bring at least 2 of the following calculations to class: (they should take 5 minutes each, maybe 10) verify the 1014 neutrinos per square meter (at earth) as claimed on page 386 how many Cl atoms are in the 100,000 gallon tank? (p. 386, 2nd column, last full paragraph) what's the reaction that converts Cl37 to Ar37? balance all 3 quantum numbers (p. 386, 2nd column, last full paragraph) |
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Super-Kamiokande and its photomultipliers surrounding the water (before it was destroyed in a chain reaction) Sudbury Neutrino Observatory detection physics the Mystery of the Missing Neutrinos -- this experiment won half of the 2002 Nobel Prize in PhysicsWeighing in on the Neutrino Mass -- the experiment that won the other half of the 2002 Nobel Prize in Physics |
close-up of magnetic coronal
loops the magnetic corona hear the sun quake see what helioseismology tells us see
the sun quake the
most amazing coronal mass ejection sunspot loops in the UV CMEs on the active sun |
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comet Holmes, brightest comet visible from US in 12 years |
pages for September 2007
pages for August 2007