if the RR Lyrae stars in a globular cluster have apparent magnitudes of 18, how far away is the cluster?
+26400 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.
$$d = 10^{0.2(m-M+5)} \quad
\small{\text {where d is in pc }}\\
m = \small{\text { Apparent magnitudes }} \\
M = \small{\text { Absolute magnitudes }} \\
\small{\text{ 1 pc = 3.26 light years }}$$
+26400 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.
$$d = 10^{0.2(m-M+5)} \quad
\small{\text {where d is in pc }}\\
m = \small{\text { Apparent magnitudes }} \\
M = \small{\text { Absolute magnitudes }} \\
\small{\text{ 1 pc = 3.26 light years }}$$
