Astronomy C

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Astronomy C

Postby bernard » August 31st, 2017, 12:17 pm

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Re: Astronomy C

Postby Unome » September 5th, 2017, 8:34 am

Rule 2 has been revised to better indicate allowed resources - the changes are quite a bit clearer.

They've added gamma ray binaries, but everything else looks very similar to 2013 (besides the DSOs of course).
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Re: Astronomy C

Postby Ashernoel » September 8th, 2017, 9:36 pm

For the DSO HR 5171 A, do you think the rules are referring to the Eclipsing Binary as "HR 5171 A" or the LBV in the binary as "HR 5171 A" according to a random catalog?

""The primary A is an eclipsing binary (components Aa and Ab, or A and C in the Catalog of Components of Double and Multiple Stars) "" Wikipedia
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Re: Astronomy C

Postby CaldwellBrownies » September 9th, 2017, 7:38 am

Ashernoel wrote:For the DSO HR 5171 A, do you think the rules are referring to the Eclipsing Binary as "HR 5171 A" or the LBV in the binary as "HR 5171 A" according to a random catalog?

""The primary A is an eclipsing binary (components Aa and Ab, or A and C in the Catalog of Components of Double and Multiple Stars) "" Wikipedia


The rules probably meant the actual binary system with Aa and Ab, since one of the focuses this year is on "orbital motions of binary systems." But I wouldn't be surprised if there was a question about the blue supergiant on tests.

I have a question: what does the "motions" portion of "using information which may include... light curves, motions" entail? And how would I study to prepare for that on tests?
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Re: Astronomy C

Postby Unome » September 9th, 2017, 10:05 am

Ashernoel wrote:For the DSO HR 5171 A, do you think the rules are referring to the Eclipsing Binary as "HR 5171 A" or the LBV in the binary as "HR 5171 A" according to a random catalog?

""The primary A is an eclipsing binary (components Aa and Ab, or A and C in the Catalog of Components of Double and Multiple Stars) "" Wikipedia

I would focus on the LBV since this year focuses on high-mass stellar evolution, but would still study both (though I'm sure you already will).
CaldwellBrownies wrote:I have a question: what does the "motions" portion of "using information which may include... light curves, motions" entail? And how would I study to prepare for that on tests?

This is probably just radial velocity graphs except left more open-ended, since I don't think radial velocity graphs are specifically mentioned.
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Re: Astronomy C

Postby Ashernoel » September 9th, 2017, 11:53 am

Unome wrote:
Ashernoel wrote:For the DSO HR 5171 A, do you think the rules are referring to the Eclipsing Binary as "HR 5171 A" or the LBV in the binary as "HR 5171 A" according to a random catalog?

""The primary A is an eclipsing binary (components Aa and Ab, or A and C in the Catalog of Components of Double and Multiple Stars) "" Wikipedia

I would focus on the LBV since this year focuses on high-mass stellar evolution, but would still study both (though I'm sure you already will).

Ya I'm just worried about accepted answers on test because it refers to two different things.
Answering HR 5171 A and referring to the LBV instead of using HR 5171 Aa could end up in not receiving credit for the answer. Likewise, answering HR 5171 Aa when referring to the LBV instead of a supervisor's desired HR 5171 A would also result in no credit.

I think a FAQ or clarification of whether the A in the rules refers to the LBV or the eclipsing binary would clear everything up... :3

If there isn't one I'll assume it refers to the EB because it only refers to the LBV in that one catalogue....
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Re: Astronomy C

Postby Magikarpmaster629 » September 9th, 2017, 2:13 pm

Ashernoel wrote:
Unome wrote:
Ashernoel wrote:For the DSO HR 5171 A, do you think the rules are referring to the Eclipsing Binary as "HR 5171 A" or the LBV in the binary as "HR 5171 A" according to a random catalog?

""The primary A is an eclipsing binary (components Aa and Ab, or A and C in the Catalog of Components of Double and Multiple Stars) "" Wikipedia

I would focus on the LBV since this year focuses on high-mass stellar evolution, but would still study both (though I'm sure you already will).

Ya I'm just worried about accepted answers on test because it refers to two different things.
Answering HR 5171 A and referring to the LBV instead of using HR 5171 Aa could end up in not receiving credit for the answer. Likewise, answering HR 5171 Aa when referring to the LBV instead of a supervisor's desired HR 5171 A would also result in no credit.

I think a FAQ or clarification of whether the A in the rules refers to the LBV or the eclipsing binary would clear everything up... :3

If there isn't one I'll assume it refers to the EB because it only refers to the LBV in that one catalogue....

The answer to "which DSO is it really?" is always "all of them." There's no such thing as too much info, this is why you're allowed a laptop. :D

Realistically, I think the problem will be test writers seeing the reason behind why this DSO is on the list. Chances are it'll just be treated like any other and you'll get the standard identify it from different wavelength images, how was it discovered/how did it affect the study of objects like it and astronomy more generally, what are some special/abnormal properties, etc.
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Re: Astronomy C

Postby raxu » September 10th, 2017, 7:01 am

Emission Nebula and H II region seems similar: the Sharpless Catalog targets H II regions, but seem to have included other emission nebulae as well...

My understanding: Emission nebula is any nebula that emits light through ionized gas, and H II region is one with ionized hydrogen. Furthermore, in H II the Hydrogen is ionized by the radiation of young stars that just formed, while other emission nebulae are ionized by stars that just died (hence containing other elements). Is that accurate?
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Re: Astronomy C

Postby Unome » September 10th, 2017, 2:05 pm

Question: Why do gamma ray images often have so much background noise? I would think that, being mostly the result of energetic rare events, they wouldn't be that common in the background.

raxu wrote:Emission Nebula and H II region seems similar: the Sharpless Catalog targets H II regions, but seem to have included other emission nebulae as well...

My understanding: Emission nebula is any nebula that emits light through ionized gas, and H II region is one with ionized hydrogen. Furthermore, in H II the Hydrogen is ionized by the radiation of young stars that just formed, while other emission nebulae are ionized by stars that just died (hence containing other elements). Is that accurate?

This seems accurate to me, though I don't know too much about this.
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Re: Astronomy C

Postby Unome » September 11th, 2017, 4:13 pm

For anyone who's curious, the two distance measurements for NGC 6357 appear to originate here (~1.7 kpc) and here (~2.6 kpc). I've yet to figure out which of these would be more likely to be accepted by event supervisors (or whether to vary my answer depending on the conditions).
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Re: Astronomy C

Postby Ashernoel » September 11th, 2017, 5:40 pm

Unome wrote:For anyone who's curious, the two distance measurements for NGC 6357 appear to originate here (~1.7 kpc) and here (~2.6 kpc). I've yet to figure out which of these would be more likely to be accepted by event supervisors (or whether to vary my answer depending on the conditions).

I have 5,500 ly in my notes, so I'd do 1.7 kpc
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Re: Astronomy C

Postby syo_astro » September 14th, 2017, 4:30 pm

Unome wrote:Question: Why do gamma ray images often have so much background noise? I would think that, being mostly the result of energetic rare events, they wouldn't be that common in the background.


Hm, nobody seemed to have responded yet...hoping to see others answer and discuss more.

Where'd you get the source for that? I don't know if *all* gamma ray images necessarily have high noise? Sorry that I always catch on generalizations :P. Nonetheless, you typically get SOME noise for any image. I know a common source of gamma rays on Earth, for example, would be cosmic rays.
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Re: Astronomy C

Postby PM2017 » September 15th, 2017, 7:47 am

Has anyone found a source for the Period-Luminosity relationship for type II Cepheids? I've looked and I can't really seem to find one.
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Re: Astronomy C

Postby Unome » September 15th, 2017, 8:50 am

syo_astro wrote:
Unome wrote:Question: Why do gamma ray images often have so much background noise? I would think that, being mostly the result of energetic rare events, they wouldn't be that common in the background.


Hm, nobody seemed to have responded yet...hoping to see others answer and discuss more.

Where'd you get the source for that? I don't know if *all* gamma ray images necessarily have high noise? Sorry that I always catch on generalizations :P. Nonetheless, you typically get SOME noise for any image. I know a common source of gamma rays on Earth, for example, would be cosmic rays.

I didn't say all, but for example this image - there seems to be a lot of background noise, though I can't tell whether that's just due to the scale being weird. It seems like gamma ray images are often rather fuzzy (though this applies to X-ray images as well in my experience).

PM2017 wrote:Has anyone found a source for the Period-Luminosity relationship for type II Cepheids? I've looked and I can't really seem to find one.
Thanks!

I believe it scales similarly, but at a generally lower luminosity.
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Re: Astronomy C

Postby CaldwellBrownies » September 16th, 2017, 8:13 am

I can't seem to find the apparent and absolute magnitude for the DSO RCW 103. Does anyone have an accurate value that they have found?
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