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24-03-2024
Biology

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M81 distance calculation: The period-luminosity relation shows that absolute magnitudes of 20-day classical Cepheids is M= -5. M81’s 20-day classical Cepheid apparent magnitudes are m = +23. The magnitude difference = m - M = 28. Intensity is 1/2.5228 = less intense. Use your scientific calculator to compute this. Compute the distance of M81, R in LY = 10 pc/√(I/I at 10 pc) = 10 pc/√(1.39 x 10^11) = _____ pc.

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