Astrophysics fall trimester  2005

syllabus   &  course expectations  &   course links

Astronomy Picture of the Day        the latest astrophysics discoveries
what's up in the
sky this week       Skywatcher's Diary for this month

Monday,
October 24
Tuesday,
October 25
Wednesday,
October 26
Thursday,
October 27
Friday,
October 28
class

jit due by 1 pm
(always done before class)

15(3,4) on Pascal and Archimedes

16(6) on conduction, convection, and radiation

17(2) on the maxwell-boltzmann distribution and origin of the perfect gas law

questions:

1) calculate the temperature required at the center of the sun
(to produce the known pressure, from the green book... use the actually density at the center of the sun!!)

2) bring examples from your own common personal experience of you gaining (or losing) energy by
by conduction....

bring 3 or 4 examples from your living environment (i.e., on earth) of energy transfer by convection...

and you thought i forgot:
what observational evidence do astronomers have that the more massive stars leave the main sequence before less massive stars?
(what do astronomers observe that shows them this)

convection is everywhere
(and especially see the pictures & captions):

convection in the kitchen and in a greenhouse
(bottom of p 182 & top of p 183)

convection in the earth's core
(p 184)

convection in the earth's mantle
( p 189)

convection in the earth's atmospher
(p 196-197)

convection in Jupiter
(p 290-291)

convection in the sun
(p 396-397,
401-402)
the solar neutrino problem:
18(4) & p. 418
(should he have won the Nobel prize?)

and again,
the solar neutrino problem:
18(4) & p. 418
(should he have won the Nobel prize?)

Weighing in on the Neutrino Mass -- the experiment that won  a Nobel Prize

homework

nuclear physics homework:

pick a nuclear reaction

calculate the light/KE released in Mev

calculate the efficiency of the reaction

web stuff

the first neutrino image of the sun

Weighing in on the Neutrino Mass -- the experiment that won  a Nobel Prize

## the Mystery of the Missing Neutrinos

Sudbury Neutrino Observatory:

detection reaction physics

## the superkamiokande detector before it was damaged by a freak chain-reaction process

damage to the SK detector
on 11/12/01
lab

news & discoveries

Titan:
is it cryovolcanoes
or just cracks
in the surface?

 Monday, October 10 Tuesday, October 11 Wednesday, October 12 Thursday, October 13 Friday, October 14 class reading (always done before class) "The New Kings of the Kuiper Belt" in October Sky and Telescope question to think about for class: how should a galaxy's rotation curve look if we were truly at the end of the galaxy? homework show (starting from Kepler's 3rd law, the center of mass condition, and the definition of orbital speed) that (Mi sin i)3/(Mi + Mv)2  =  P (Vv sin i)3/(8p3) i used the Kepler's 3rd law version that has the special units (so that 4p2/G = 1) web stuff extrasolar planet catalog lab finish parts D and E of binary star lab completed binary star  lab due news & discoveries the 10th planet (Xena) has a moon

Monday,
October 3
Tuesday,
October 4
Wednesday,
October 5
Thursday,
October 6
Friday,
October 7
class
play with spectroscopic binary applet (below)

jit due by 2 pm

see homework below
see homework below
see homework below
(always done before class)
dark energy

&

binary star
sections 19(9,10):

1) what are the 3 different ways that a binary can be detected on Earth OTHER than actually seeing two stars in the telescope orbit over time?
(in other words,
if we only see one point of light in the telescope, how could we infer that  the system was a pair of stars?)

2)  Suppose we observe a spectroscopic binary over a complete period like the one Toan and James showed you in the green book....  do you have a plan for figuring out the masses of the two stars?  in other words, given what's observed, how do you use the physics equations to find the masses of the individual stars?
19(5-8)
19(11)

25(1-4)?

homework

find the power in the power law
for the mass-luminosity relation

ditto for the mass-radius relation that's in the green book
bring to class

1) the orbital speed of each star

2) the orbit radius of each star, in the units requested

(and you dont have to stop there, you can continue ...)

for your "distance" find the mass of the galaxy inside your distance

if you didnt do the power calculations
(see wednesday),
make sure that you do them and bring them to class today

for monday, finish through part E of the lab
web stuff
the spectroscopic binary applet

the eclipsing binary applet

### are periodic extinctions    statistically real?  a Scientific American debate

The Great Dying: the
buckeyball evidence

(but on the other hand, paleontologist produces evidence for a different   theory on dinosaur extinction)

lab

news & discoveries
latest pictures of the asteroid Itokawa
(samples to be returned soon)

"Big Baby" galaxies found in young universe

Tycho's SNR provides evidence for cosmic rays

astro pages for september2005
astro pages for august 2005