Astronomy > Lab Report > Astro Lab 2 University of Washington ASTRO 101 (All)
Astro Lab 2 University of Washington ASTRO 101
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1. Find the (B-V) color of the stars that are leaving the main sequence in each cluster by drawing a vertical line where the main sequence seems to begin ‘turning’ upwards and to the right. The ma... in sequence lifetimes of different spectral types and their Cameron Escott May 17th, 2019 Astronomy 101 associated colors are given in Table 2 of this lab. Use these main sequence lifetimes and the color of the stars leaving the main sequence in each cluster to estimate the age of 47 Tuc and the Pleiades. Turning point (B-V) for 47 Tuc: .55 Turning point (B-V) for the Pleiades: -.04 Approximate age for 47 Tuc: 4 x 10 9❑ Approximate age for the Pleiades: 2.15 x1 0 8❑ 2. You may have noticed by now that though the main sequences of these two clusters appear to slope in the same general sense from left to right in each plot, they do not share the same values on the y-axis at all. Your plots should show that stars at (B-V) ~ 1.0 in 47 Tuc have an apparent magnitude of about 21, and stars in the Pleiades at this same color have an apparent magnitud [Show More]
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