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Course 45834
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Consider a main-sequence star with L = 4 L⊙. Is it more massive than the Sun?
Consider a main-sequence star with L = 4 L⊙. Estimate M/M⊙ for the mystery star using L/L⊙ = (M/M⊙)3.5 with L = 4 L⊙.
Consider a main-sequence star with L = 4 L⊙. Compared with the Sun, is it longer-lived or shorter-lived?
Consider a main-sequence star with L = 4 L⊙. Is it hotter than the Sun?
Two stars A and B are on the main sequence. Star A is more luminous than Star B. Which has the larger radius?
Two stars A and B are on the main sequence. Star A is more luminous than Star B. Which leaves the main sequence first?
Consider two main-sequence stars A and B; A is more luminous than B. Which has the higher surface temperature?
Two stars A and B are on the main sequence. Star A is more luminous than Star B. Which is more massive?
Predict first. If Earth moved to half its current distance from the Sun, would the flux be 2×, 4×, or 8× the present value? Choose your prediction before calculating.
Calculate. The solar flux at Earth is ≈ 1300 W m⁻². What is the flux (in W m⁻²) at half the Earth–Sun distance?