- Answer:1. W49B
a. Iron is only in half the remnant, and other things including silicon and sulfur were evenly spread. Also, It shows x-ray emission from chromium and manganese.
b. The SN is type 1b/1c probably, which means the progenitor was probably an LBV/WR with a lot of mass loss. Wikipedia says the progenitor was probably around 25 solar masses.
c. Given a period of 25 days, we can calculate the absolute magnitude using the period luminosity relationship. M = -2.8log(25 days) - 1.43 gives an absolute magnitude of M = -5.34. Using m - (-5.34) = -5+5log(7972 pc) gives m = 9.17.
2. HR 5171A
a. B, C, F, i think
b. its currently a yellow hypergiant, which is a pretty unstable state that is probably between red supergiant and blue supergiant stages, which explains why we see so few of them. I don't know if HR5171A is moving towards a bluer or redder stage, but it could become a blue supergiant, a red supergiant, or (very unlikely, it might be able to go supernova directly). It could shed it's outer envelope and become a WR binary. Eventually it will explode in a type 2 (probably P but it depends on how much mass loss in later stages) or type 1b/1c (especially if there is more mass loss such as if it enters a WR stage) supernova, and probably leave behind a black hole.
c. 1315 to 1575 solar radii
b. 273 ms
Looks good! Your turn again.
By the way, we should do something where we all log on and rapid fire this stuff, one after another. How does 1/21/18, at 3 PM PST (6 PM eastern) sound?