Astrophysics fall trimester  2007

 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  

November 12
November 13
November 14
November 15
final exam

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

web stuff


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

of the week

November 5
November 6
November 7

November 8
November 9


you should finish parts A, B, and C of the interstellar matter lab in class today

(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


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

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?

(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

web stuff

star formation:

star formation propagation
(grav collapse induced by shock wave from O/B stellar winds)

M16 before hubble
 Star-Birth in M16
the Eagle in 2005

shock-wave triggered starbirth
Hubble presents a family portrait of a parent and 6 offspring

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

  cloud-cloud collisions:

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

Milky Way Molecule Map

how stellar disks form and evolve
(theory in pictures)

the first observations of jets and disks during stellar birth 

stellar Disks and Jets

  12-c-yr long jets

Stellar Disks Set Stage for
Planet Birth in New Hubble Images

disks without jets: planet building?:

10 years ago we had 1; now,  hundreds

the original discovery of proplyds in the

Orion Nebula

Orion Nebula Mosaic and
Protoplanetary Disks

protoplanets within disks?:

making protoplanets at beta Pictoris


prelab (to be borught to class completed in your lab book)  for the interstellar matter lab

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?

October 29
October 30
October 31
Nov 1
November 2
 no classes for students
jit due by noon 
(always done before class)
 read the convection reading that you didnt do last week:

18(5) on convection,
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
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?

(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)

web stuff
 the first neutrino image of the sun

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 Physics

Weighing in on the Neutrino Mass -- the experiment that won  the other half of the 2002 Nobel Prize in Physics

 the active sun in the ultraviolet

close-up of magnetic coronal loops

the magnetic corona

a typical coronal hole

hear the sun quake

see what helioseismology tells us

see the sun quake

the most amazing coronal mass ejection
(plus see 2 comets

Seething Sunspot

the solar magnetic carpet

sunspot loops in the UV

CMEs on the active sun

news & discoveries
comet Holmes,
brightest comet visible from US in 12 years

pages for October 2007
pages for September 2007
pages for August 2007