Question

Where are the most massive stars to be found in the main sequence of a Hertzsprung-Russell diagram?

A) upper left end
B) Main-sequence stars all have approximately the same mass, by definition.
C) center
D) lower right end

Answer 1

The most massive stars are found in the upper left end of the main sequence in an H-R diagram.

Step-by-step explanation:

The most massive stars can be found in the upper left end of the main sequence of a Hertzsprung-Russell (H-R) diagram.

The H-R diagram is a plot of stellar luminosity against surface temperature. Most stars lie on the main sequence, which extends diagonally across the H-R diagram from high temperature and high luminosity to low temperature and low luminosity. The position of a star along the main sequence is determined by its mass. High-mass stars are hotter and brighter than low-mass stars on the main sequence.

For example, the most massive main-sequence stars are the most luminous ones and are at the upper left of the H-R diagram. These superluminous stars are exceedingly hot, very blue stars of spectral type O.