In Very Very Rough Approximation A Star Cluster Like M67 Con Tains 200 F5 Stars Stars At The Main Sequence Turn Off 1 (32.19 KiB) Viewed 41 times
In very, very rough approximation, a star cluster like M67 contains 200 F5 stars (stars at the main-sequence turn-off) and 20 K0III giant stars. In the following we ignore dust (or assume that the values are dust- corrected). Use the table below to show that its colour B – V ≈ 0.68 and estimate its distance given that the apparent V-magnitude of M67 is 6.1.
Table 1: Average magnitudes and colours (from Sparke & Gallagher Tables 1.4 and 1.5)
T
In very, very rough approximation, a star cluster like M67 con- tains 200 F5 stars (stars at the main-sequence turn-off) and 20 KOIII giant stars. In the following we ignore dust (or assume that the values are dust- corrected). Use the table below to show that its colour BV≈ 0.68 and estimate its distance given that the apparent V-magnitude of M67 is 6.1. Table 1: Average magnitudes and colours (from Sparke & Gallagher Tables 1.4 and 1.5) Type My BC B-V F5 3.3 0.1 0.41 ΚΟ 0.7 0.4 1.02
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