What determines the brightness of a star?
- b = L / (4πd2) [W/m2]
What determines the luminosity of a star?
- Assuming a blackbody radiator:
o L = σAT4
o σ = 5.67 x 10-8 [W/m2K4]
What determines the surface temperature of a star?
- Wein's Law: T = (2.90 x 10-3(K·m))/ (λmax)
More massive stars are also more luminous.
Absolute magnitude (M) is the magnitude of a star when observed from 10 parsecs.
Relative magnitude (m) is the magnitude of a star when observed from the Earth (or nearby).
Stars radiate energy through hydrogen fusion.
Fg = GMm/d2
White dwarf- in equilibrium (not a black hole) due to "electron degeneracy"
1 parsec = 3.26 light-years
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