PROBLEM SET #3
1. A star is determined (by parallax) to be 5pc away. It has a
blackbody spectrum which peaks at 2900Å. At Earth the flux from this star is measured to
be 10-9 ergs/cm 2 /s .
2. A star is measured to have a spectrum given by:
a) What is the temperature of the star?
An active galaxy looks like a star with temperature 5000K surrounded by an electron cloud with all electrons having g = 103
a) Into what part of the spectrum would one expect to see the galaxy