Question

Among main sequence stars, those with the highest surface temperatures have ___________. Among main sequence stars, those with the highest surface temperatures have ___________. the
a) lowest masses and longest lifetimes
b) the highest masses and shortest lifetimes
c) the lowest masses and shortest lifetimes
d0 the highest masses and longest lifetimes

Answer 1

Answer:

Option b

Explanation:

• Higher mass of the main sequence stars give rise to larger compression leading to higher surface temperatures which in turn results in faster rate of fusion leading to greater luminosity.

• The luminosity depends on the reactions in the core. the higher the reaction sin the core the more is the luminosity of the main sequence star.

• The lifetimes of the highest masses stars of the main sequence is the shortest  because of the reason that in spite of having a greater amount of hydrogen inside for nuclear reactions, the rate of consumption of this hydrogen is quite fast.