1. What is the total mass of a visual binary system if the average separation of the stars is 8…

1. What is the total mass of a visual binary system if the average separation of the stars is 8 AU and their orbital period is 20 years? 2. What is the luminosity of a 4-solar-mass main-sequence star? Of a 8-solar-mass main-sequence star? Can you easily determine the luminosity of a 4-solar-mass red giant star?  

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