Starting this up again:
Star C and Supernova A have the same apparent magnitude. Supernova A is a type Ia and is located in a galaxy 15 Mpcs distant. Assume all type Ia supernovae are all the same brightness, with an absolute magnitude of -19.3.
a) What is the recessional velocity of the galaxy in which Supernova A is located? Answer in m/s.
b) Type Ia supernovae have strong silicon lines. One Si II line from Supernova A has an apparent wavelength of 126.94 nm. What was its emitted wavelength in nm?
c) What is the apparent magnitude of Star C?
d) What is the distance to Star C in parsecs?
Oh whoops, I wrote these questions for my event partner and I took out some info. (d) should read:
The observed flux from Star C is measured to be 6.04*10^-13 W/m^2. If the luminosity of Star C is 0.286 solar luminosities, What is the distance to Star C in parsecs? Calculate using the Stefan Boltzmann Law. (You could just use distance mod, it's the same thing, but my partner needed some SB practice)
Answer is~123 parsecs