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if the RR Lyrae stars in a globular cluster have apparent magnitudes of 18, how far away is the cluster?

 Jan 22, 2015

Best Answer 

 #1
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If the RR Lyrae stars in a globular cluster have apparent magnitudes of 18, how far away is the cluster ?

You need the absolute magitude too.

d=100.2(mM+5)where d is in pc m= Apparent magnitudes M= Absolute magnitudes  1 pc = 3.26 light years 

 Jan 22, 2015
 #1
avatar+26397 
+5
Best Answer

If the RR Lyrae stars in a globular cluster have apparent magnitudes of 18, how far away is the cluster ?

You need the absolute magitude too.

d=100.2(mM+5)where d is in pc m= Apparent magnitudes M= Absolute magnitudes  1 pc = 3.26 light years 

heureka Jan 22, 2015

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