ASTR 102 Lecture Notes - Lecture 2: Distance Modulus, Electronvolt, Hydrogen Fuel
Document Summary
V vs b-v (shifted star cluster and main sequence) The star cluster data had to be all shifted by 4 units of v(vertically). Therefore the distance modulus for hyades is 4. The turnoff star of the cluster in correspondence to main sequence star has a b-v value of +1. 63, showing that the star has an approximate mass of 0. 21m(sun). tstar = 1010(0. 21)-2. 3 tstar = 3. 62x1011 years. The turnoff star in the cluster has a b-v value of approximately +1. 18 which shows the mass of the star to be 0. 7m(sun). tstar = 1010(0. 70)-2. 3 tstar = 2. 27x1010 years. Both these star clusters are younger than hyades, by a power of 1. Showing that hyades is significantly older than the other two clusters. The oldest star in the hyades cluster is an m5 star, while the oldest stars in the other two clusters are k5.
