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

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

Guest Jan 22, 2015

Best Answer

+26396

+5

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.

$d = 10^{0.2(m-M+5)} \quad \small{\text {where d is in pc }}\\ m = \small{\text { Apparent magnitudes }} \\ M = \small{\text { Absolute magnitudes }} \\ \small{\text{ 1 pc = 3.26 light years }}$

heureka Jan 22, 2015

1⁺⁰ Answers

+26396

+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.

$d = 10^{0.2(m-M+5)} \quad \small{\text {where d is in pc }}\\ m = \small{\text { Apparent magnitudes }} \\ M = \small{\text { Absolute magnitudes }} \\ \small{\text{ 1 pc = 3.26 light years }}$

heureka Jan 22, 2015

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