1. Stellar mass is usually measured in terms of?
1. Stellar mass is usually measured in terms of?
Answer: It is usually enumerated in terms of the Sun's mass as a proportion of a solar mass (M☉). and stellar distances are mesaured in light years
Explanation:
To take a specific example, Sirius is one of the few binary stars in Appendix J for which we have enough information to apply Kepler’s third law:
D3=(M1+M2)P2
In this case, the two stars, the one we usually call Sirius and its very faint companion, are separated by about 20 AU and have an orbital period of about 50 years. If we place these values in the formula we would have
(20)3=(M1+M2)(50)28000=(M1+M2)(2500)
This can be solved for the sum of the masses:
M1+M2=80002500=3.2
Therefore, the sum of masses of the two stars in the Sirius binary system is 3.2 times the Sun’s mass. In order to determine the individual mass of each star, we would need the velocities of the two stars and the orientation of the orbit relative to our line of sight.
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