Binary Stars Homework Questions Fill in the blank White, Orange 1. Based on colo
ID: 107396 • Letter: B
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Binary Stars Homework Questions
Fill in the blank
White, Orange
1. Based on color and magnitude differences, which stars are in their giant phase and which are still on the main sequence?
*Hint: The only way a red star can be more luminous than a bluer ones is if it is a giant or supergiant, and red stars that are fainter than bluers ones are proably on the main sequence. All blue stars are probably on the main sequence.
2. If the Sun had a tiny dwarf companion (much less massive than the Sun) at the same distance as the seperation of the two stars in Alberio (which you need to look up), how long would it take to orbit the Sun? *Hint: use Kepler's 3rd law). How long would it take to move 1 degree with respect to stars?
Binary Star Seperation Magnitudes Colors Cor Caroli 20" 2.9, 5.6 Yellow, Blue Castor 3" 1.9, 2.9White, Orange
Rigel 9" 0.1, 6.8 Blue White Orionis 12" 3.8, 6.6 Monoceri 7" 4.7, 5.2Explanation / Answer
1.We can find that from the given information,blue stars are present in the main sequence. Among the given 5 stars,2stars are blue which means that they are present in main sequence.
Cor caroli and Rigel are present in the main sequence. The remaining category of stars -Castor,orionis and Monoceri are present in their giant phase.
2.If the sun is considered to have a dwarf and it is less massive when compared to the sun,then the dwarf would definitely take less than 213years because the period of rotation for alberio is 213yrs. Since the dwarf is present near to the sun,it would take less than 213years.
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