If a star is hot and bright, it is located in which region of the H-R diagram?

If a star is hot and bright, it is located in which region of the H-R diagram?

• A. Bottom left
• B. Upper left
• C. Upper right
• D. Bottom right

Answer: (B)

On the Hertzsprung-Russell diagram, temperature and brightness define where a star sits: hotter stars are placed toward the left, and brighter stars are higher up. A star that is both hot and bright has a high temperature and a high luminosity, so its location is in the upper-left part of the diagram. This region includes very hot, luminous stars, such as the hottest blue-type stars, whether they’re on the main sequence or in bright giant/supergiant stages. Conversely, cooler or dimmer stars appear farther to the right or lower on the diagram.

On the Hertzsprung-Russell diagram, temperature and brightness define where a star sits: hotter stars are placed toward the left, and brighter stars are higher up. A star that is both hot and bright has a high temperature and a high luminosity, so its location is in the upper-left part of the diagram. This region includes very hot, luminous stars, such as the hottest blue-type stars, whether they’re on the main sequence or in bright giant/supergiant stages. Conversely, cooler or dimmer stars appear farther to the right or lower on the diagram.