A certain star has a (B-V) color index of 0.61 and a B magnitude of 6.87. How many times brighter is this star when measured using a V filter than when using a B filter?
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A certain star has a (B-V) color index of 0.61 and a B magnitude of 6.87. How many times brighter is this star when measured using a V filter than when using a B filter?
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- Star 1 and star 2 have the same V-magnitude, V = 7.5. However, they have different B-magnitudes, B1 = 7.2 and B2 = 8.5. What are the (B − V) colors of the two stars?Imagine a planet orbiting a star. Observations show a Doppler shift in the star's spectrum of 58 m/s over the 3.3 day orbit of the planet. What is the mass of the planet in kg? Assume the star has the same mass as the Sun (2.0 x1030 kg), there are 365.25 days in a year, and 1AU = 1.5 x 1011 m.Q1