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Unformatted text preview: magnitude star than the 9 th magnitude star? 3) If the proper motion of a star is 6 arc seconds, what is the distance to this star? 4) A galaxy has a recessional velocity of 3,500 km/s what is the distance to this galaxy if the Hubble constant is 65 km/s/Mpc? 5) What is the luminosity of F-type star? What is the luminosity of A-type star? How much brighter is the F-type than the A-type star (L F /L a )? How much heavier is A-type star than the F-type star?...
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- Fall '09
- Galaxies, magnitude star, th magnitude star