Astronomy C

Luo
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Re: Astronomy C

Postby Luo » April 27th, 2011, 6:26 pm

For the 2009 test, you want to find out its spectral type (O B A etc) and from there you can approximate its absolute magnitude using an H-R diagram.
Hmmm. Would reading off an H-R Diagram produce an accurate and precise enough reading for the absolute magnitude? When I tried it, my final answer for the distance was on the same order of magnitude as the correct answer, but it wasn't within the allowable range specified in the key. What H-R Diagram are you using? Did you get the correct answer that way?
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Re: Astronomy C

Postby Infinity Flat » April 27th, 2011, 6:53 pm

For the 2009 test, you want to find out its spectral type (O B A etc) and from there you can approximate its absolute magnitude using an H-R diagram.
Hmmm. Would reading off an H-R Diagram produce an accurate and precise enough reading for the absolute magnitude? When I tried it, my final answer for the distance was on the same order of magnitude as the correct answer, but it wasn't within the allowable range specified in the key. What H-R Diagram are you using? Did you get the correct answer that way?
I haven't actually done the test, but I'd assume then that you need to look into the subclasses, like Of or A1V in order to get into the allowable range.
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

Luo
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Re: Astronomy C

Postby Luo » April 28th, 2011, 8:05 pm

I haven't actually done the test, but I'd assume then that you need to look into the subclasses, like Of or A1V in order to get into the allowable range.
Yes, I think that's what you might have to do, but it seems to me that pinpointing the exact subclass based on a diagram would be very difficult to do precisely. I wonder what the test writer was intending.

On a separate note, what Astronomy textbooks have people found to be good for this event? I've been using Astronomy: A Self-Teaching Guide, which is clear and concise, but it's definitely not in-depth enough for the material on the Nationals tests.
Proud alumnus of Mounds View High School Science Olympiad, Arden Hills, MN
Co-founder of the MIT Science Olympiad Invitational Tournament: http://scioly.mit.edu/

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Re: Astronomy C

Postby Infinity Flat » April 28th, 2011, 8:16 pm

I haven't actually done the test, but I'd assume then that you need to look into the subclasses, like Of or A1V in order to get into the allowable range.
Yes, I think that's what you might have to do, but it seems to me that pinpointing the exact subclass based on a diagram would be very difficult to do precisely. I wonder what the test writer was intending.

On a separate note, what Astronomy textbooks have people found to be good for this event? I've been using Astronomy: A Self-Teaching Guide, which is clear and concise, but it's definitely not in-depth enough for the material on the Nationals tests.
I've been using Carrol / Ostlie's Introduction to Modern Astrophysics (2nd Edition).
It's a VERY strong text, and has a good balance have math and concepts.
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

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Re: Astronomy C

Postby Infinity Flat » April 30th, 2011, 4:35 pm

Not sure if anyone else has seen this, but a lot of the worksheets here are really good if you want to work on the math.
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

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Re: Astronomy C

Postby QuantumLeaper » May 20th, 2011, 2:28 pm

Thank you, Infinity. :) These look awesome.
"I know that the molecules in my body are traceable to phenomena in the cosmos. That makes me want to grab people on the street and say: ‘Have you HEARD THIS?"

-Neil deGrasse Tyson

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Re: Astronomy C

Postby Infinity Flat » May 22nd, 2011, 10:52 pm

11th at nationals, woot! A lot better than I was expecting, and I really enjoyed doing the test. Pacing was key, as was skipping questions you just didn't know / have time to look at. Learned my lesson from diseases earlier that morning :P
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

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Re: Astronomy C

Postby salcedam » May 24th, 2011, 8:08 am

What are some good textbooks to use to study over the summer?
2011 - 2012 Season Results:
Whiting, IN - Astro (1st), 4N6 (2nd), Fermi (2nd)
Boyceville, WI - Astro (3rd), 4N6 (1st)
Belvidere, IL - 4N6 (1st), Fermi (2nd)
WSU, OH - 4N6 (12th)
Loyola, IL - 4N6 (1st), Fermi (1st), TPS (3rd)
OCC Regional - 4N6 (1st), Fermi (1st)
UCF Nationals - 4N6 (8th)

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Re: Astronomy C

Postby Infinity Flat » May 24th, 2011, 10:52 am

What are some good textbooks to use to study over the summer?
For some basic stuff, http://www.astronomynotes.com

For more advanced, Carrol & Ostlie's Introduction to Modern Astrophysics.
(State, Nationals)
2013: Astro (2, 6) / Chem (2, 5) / Circuits (8, 36) / Diseases (1,1) / Fermi (N/A, 24) / Materials (1, N/A)
2012 : Astro (1, 11) / Chem (N/A, 13) / Diseases (3, 1) / Optics (2, 3) / Sounds (2, 1)
2011: Astro(2,11) / Diseases (1,27) / Optics (1,13) / Proteins (2,15)

salcedam
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Re: Astronomy C

Postby salcedam » May 24th, 2011, 6:25 pm

What are some good textbooks to use to study over the summer?
For some basic stuff, http://www.astronomynotes.com

For more advanced, Carrol & Ostlie's Introduction to Modern Astrophysics.
Thanks! Do you have any tips for studying the DSO's (once the list comes out)?
2011 - 2012 Season Results:
Whiting, IN - Astro (1st), 4N6 (2nd), Fermi (2nd)
Boyceville, WI - Astro (3rd), 4N6 (1st)
Belvidere, IL - 4N6 (1st), Fermi (2nd)
WSU, OH - 4N6 (12th)
Loyola, IL - 4N6 (1st), Fermi (1st), TPS (3rd)
OCC Regional - 4N6 (1st), Fermi (1st)
UCF Nationals - 4N6 (8th)


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