Horizontal-Branch Stars Have a Wide Range of Temperatures and Luminosities

question 63

Multiple Choice

Horizontal-branch stars have a wide range of temperatures and luminosities between 50 and 100 times that of the Sun, so they are in what stage of their lives?

• A) gravitational contraction before the start of core hydrogen burning
• B) hydrogen shell burning, with a degenerate helium core
• C) core helium burning and shell hydrogen burning
• D) core helium burning only

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Definitions:

Perceptual Process

The sequence of steps that includes the gathering, organizing, and interpretation of sensory information to understand an environment or situation.

Internal Factor

Influences originating within an individual, such as personal beliefs, values, and biological characteristics.

Perceptual Selection

The process by which individuals screen and select the various stimuli that vie for their attention, based on various factors.

Internal Factors

Elements within an organization such as corporate culture, employee morale, and internal processes that influence its operations.