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A star has a temperature of 5105 K and a radius of 4.10×106 km . What...

A star has a temperature of 5105 K and a radius of 4.10×106 km . What is the radius of this star in units of the solar radius, ?sun ? ?sun=6.9551×105 km. radius: ?sun What is the temperature of this star in units of the solar temperature, ?sun ? ?sun=5777 K. temperature: ?sun Given that the luminosity of a star is given as a function of its radius ? and temperature ? by the equation ?=4??2??4 what is the luminosity of this star in units of the solar luminosity, ?sun ? luminosity:

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