| Homework
#5 |
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| • | 1.
Mass of the Binary stars: 1.8 solar masses |
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| • | 2.
Parsecs & Parallax: d = 1/p, so 1/12 of an arcsec |
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| • | 3. Most of the nearby stars are cool
K and M stars. |
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| • | 4.
m=-1.5, M=1.4. Recall 10 pc is about
30 lt. yrs. |
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| – | Hard
method: m – M = -5 + 5log(d/1pc), so less than 30 years |
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| • | 5. d
=145 pc, M = -5.2, so m = 0.6 (other
answers bad) |
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| • | 6.
Same M, one star is type G, one is type B.
G is bigger. |
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