If the RR Lyrae stars in a globular cluster have average apparent magnitudes of +12, how far away (in pc) is the cluster? (Hints: See the following figure, and use the magnitude-distance formula: d = 10(mv - My+5)/5.) 6 Туре (classical) Cepheids -5 104 103 Type II Cepheids 102 RR Lyrae stars 0.3 3 10 30 100 Pulsation period (days) pc Need Help? Read It Luminosity, LIL Absolute magnitude

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If the RR Lyrae stars in a globular cluster have average apparent magnitudes of +12, how far away (in pc) is the cluster? (Hints: See the following
figure, and use the magnitude-distance formula: d = 10(mv - Myt5)/5.)
-7
-6
Туре
(classical)
Cepheids
-5
104
103
Type II
Cepheids
-1
102
RR Lyrae stars
0.3
1
10
30
100
Pulsation period (days)
pc
Need Help?
Read It
Absolute magnitude
Luminosity, L/Lo
Transcribed Image Text:If the RR Lyrae stars in a globular cluster have average apparent magnitudes of +12, how far away (in pc) is the cluster? (Hints: See the following figure, and use the magnitude-distance formula: d = 10(mv - Myt5)/5.) -7 -6 Туре (classical) Cepheids -5 104 103 Type II Cepheids -1 102 RR Lyrae stars 0.3 1 10 30 100 Pulsation period (days) pc Need Help? Read It Absolute magnitude Luminosity, L/Lo
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