Astronomy C

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Re: Astronomy C

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

Infinity Flat wrote: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

luo wrote:
Infinity Flat wrote: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)

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Re: Astronomy C

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

Infinity Flat wrote: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.
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Re: Astronomy C

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

luo wrote:
Infinity Flat wrote: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.
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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.
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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

salcedam wrote: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)

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Re: Astronomy C

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

Infinity Flat wrote:
salcedam wrote: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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Re: Astronomy C

Postby Infinity Flat » May 24th, 2011, 6:33 pm

salcedam wrote:
Infinity Flat wrote:
salcedam wrote: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)?


Honestly, I just start with a good old Google search. Usually Chandra and APOD have the best pages and information on them. A lot of the question for the DSO don't necessarily test your knowledge on the object itself, but the class of objects it belongs to.

For example, a question might ask, "Which DSO is a galaxy that has very strong, narrow spectral lines?" Now, I don't know the answer to this off the top of my head.I do know, however, that type 2 Seyfert galaxies have spectra like this, so I would check to see which DSO is a type 2 Seyfert galaxy. (The answer is NGC 1068)
(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, 6:41 pm

Ah...okay. :D

Is there a topic rotation in Astronomy? I know this year and last year was about galaxies and two years ago, it was about variable stars. (Sorry for asking so many questions...) >_<
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 AlphaTauri » May 24th, 2011, 6:43 pm

Personally, I also like to do an image search on each DSO. I've seen a lot of questions on ID'ing DSOs from their pictures, and there's usually a follow-up question that asks what wavelengths the image was taken in (UV, radio, visible, etc).

Also, make sure to study things related to the DSOs, even if you don't think it's particularly important. For example, one question (I believe it was the first question) on PA States Astro test was "What does MACS (as in MACSJ0717.5) stand for?" My partner and I were caught completely off-guard...later we googled it and found out it stood for "MAssive Cluster Survey". Oops.

Edit: Astro does change topic every year, but it's tough to predict what it will change to.
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Re: Astronomy C

Postby Infinity Flat » May 24th, 2011, 6:58 pm

AlphaTauri wrote:Edit: Astro does change topic every year, but it's tough to predict what it will change to.


I'm pretty sure it stays the same for 3 years. It was galaxies last year, and will probably be galaxies again next year. After that, I'm not sure. Maybe stellar evolution?
(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 pjgscioisamazing » May 24th, 2011, 7:30 pm

Infinity Flat wrote:
AlphaTauri wrote:Edit: Astro does change topic every year, but it's tough to predict what it will change to.


I'm pretty sure it stays the same for 3 years. It was galaxies last year, and will probably be galaxies again next year. After that, I'm not sure. Maybe stellar evolution?


Well It did slightly change this year. While it was still galaxies, last year was focused on Normal and Starburst Galaxies, while this year was focused on Active Galaxies and Galaxy Clusters and Groups.
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