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PROBLEM SET #3 ASTR 3730
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: ergs/cm2/s/Hz a) What is the temperature of the star? 3.
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
starlight scattered? |