Astronomy C

[syo_astro]

Then tell me how that would explain the case of w49b . I mean if I understand your question to mean whether there's an SNR (like the large cloud of colorful ejecta you see with many supernovae ). It is also true that a black hole is an "SNR" since it is a remnant...from a supernova. It actually depends on what you're taking about, but assuming it's not a collapsar like cygnus x-1 have you taken a look at w49b. Hopefully I understood your question.

As for rr lyrae and type ia SNe I'll agree, there's a plus or minus for those values but what's said is fine. I would say oh what if they give you solar luminosities or something but from your equations sounds like you know how to handle that. There's also a way to use novae as standard candles but I've never found a question on it or where it was used exactly. Other supernovae can be used as sorts of standard candles iirc. Light echo calculations and correlations I think have been used to try to figure that out. But hands down knowing rr lyrae, cepheids, type ia are most useful.

Any specific problems with this or the equations stuff from before?

[astro124]

Yeah, the ejecta wave that often comes with most supernovae is what I was asking about. I wanted to see if it was possible for a black hole to have an ejecta wave round it. As for W49B, I thought read somewhere that some of the clouds and interstellar debris existed before the star went supernova (and isn't only theorized that there is a black hole).

As for the process of a Type II supernova, am I correct? Does the core collapse, followed by the outer envelope of the star imploding in on itself, to later then bounce of the neutron star and create the shockwave? I remember seeing this question last year on the Astro state test for Arizona, and I was pretty confident with my answer (also, it was the only one that made sense).

Finally, by collapsar do you mean a star (over 40-50 solar masses) that collapses directly into a black hole without a supernova event?

[syo_astro]

Yeah, the ejecta wave that often comes with most supernovae is what I was asking about. I wanted to see if it was possible for a black hole to have an ejecta wave round it. As for W49B, I thought read somewhere that some of the clouds and interstellar debris existed before the star went supernova (and isn't only theorized that there is a black hole).

As for the process of a Type II supernova, am I correct? Does the core collapse, followed by the outer envelope of the star imploding in on itself, to later then bounce of the neutron star and create the shockwave? I remember seeing this question last year on the Astro state test for Arizona, and I was pretty confident with my answer (also, it was the only one that made sense).

Finally, by collapsar do you mean a star (over 40-50 solar masses) that collapses directly into a black hole without a supernova event?

For W49B I was just pointing out an example that's kinda relevant (you did mention a black hole with a massive explosion, closest DSO that's relevant this year ). Also, as far as theories go, this was a "careful search done", it's decently likely. I'd like to see hints of a plerion or something more closely associated to a neutron star personally, a black hole is decently possible. I could say we only speak in theory, it's only "theorized" how supernovae mechanisms work (don't mean too sound defensive/argumentative, hope you know what I mean). You sure on the surrounding ejecta? I thought that was just one of a few theories, and the bipolar jet one that seemed unusual ended up being more likely. I am curious why our info conflicts there (I could very well be reading incorrectly, sorry if I am).

I think the theory behind how supernova remnants are left behind is slightly complex...One explanation to my understanding that I looked up to check (wow I didn't know neutron stars could be compressed this much!) is that the implosion occurs and then this pushes onto the neutron star until it's so dense you get an explosion. I think the point was basically you're right as far as a rebound with the neutron star goes, but to add:

However, the rebound is only part of the mechanism by which the supernova generates its energy. The binding energy of a neutron star is much less than that of a non-collapsed stellar core. The tremendous amount of energy generated by the neutron star formation drives the supernova. The same is true with the formation of a black hole, save that the binding energy of the black hole is even less than a neutron star and hence the explosion would be somewhat more energetic. So the formation to a black hole still includes an explosion.

An example does exist though, a black hole with an SNR would be SS433 and W50 (it's quite awesome, just saying ).

By collapsar I was just discussing an example possibly by what you mean, where there wasn't exactly a remnant left behind, but we know there also possibly wasn't a supernova (Cyg X-1 if you recall from last year is a fairly major example of this).

Phew, that help clear some things up?

[astro124]

Yeah, that really helped! Thanks a lot! Do you have a link to the source where you got your information. I want to try and make sure I have that stuff in my notes this year, since you never know what might be asked.

Also, would you mind taking a look at my DSO catalog?

[syo_astro]

Yeah, that really helped! Thanks a lot! Do you have a link to the source where you got your information. I want to try and make sure I have that stuff in my notes this year, since you never know what might be asked.

Also, would you mind taking a look at my DSO catalog?

http://imagine.gsfc.nasa.gov/docs/ask_a ... 0215d.html. That's what I basically had for the supernova rebound. For W49B and the other objects...I mean, those I looked at multiple papers and chandra to assess, so I'd rather not have to link all of it unless you can't find it?

ALSO WOAH, YOU ALREADY HAVE A CATALOG, WHAT'S THE NAME (okay, sorry couldn't help it, ie. Messier, NGC, IC XD)? I'm a bit busy prepping for states myself, but I like to help. I'll try to take a look, how do you want me to (PM, email, PM asking for my email, I guess something along those lines)?

[astro124]

One day I'll have my own catalog named after myself. I'll name all the SNR and black holes after you (especially the ones with black hole ejecta....)
Example:

Name: Syo Astro 1
Type: SNR/Black Hole
Location/Constellation:
Distance............
.....................

Oh, and I think I sent you a PM, you can reply to that or just talk on the forums. Either works for me.

[syo_astro]

LOL, maybe I'll have one too . We can collab haha. Would be very fun (I'm curious if it would be overly detailed hehehe). Either way, I responded to yours (can you go onto the doc, I just feel like I find it easier to chat than make a bunch of comments).

[astro124]

Yeah, let me open up so that people with the link can make edits. I forgot to do that earlier.

[Asteroidea]

It would be awesome if someone could post the answers to the Practice Astronomy test on the test exchange.......

[astro124]

The one made by Alpha Tauri? You would have to ask him, but I thought he said awhile back that he had the answer key finished.