The Hydrogen Lines in Spectral Type a Stars

question 121

Multiple Choice

The hydrogen lines in spectral type A stars

• A)are most narrow for supergiants.
• B)are most narrow for main-sequence stars.
• C)can not be used to estimate the luminosity of the star.
• D)are very weak and difficult to see.
• E)are useful in determining the apparent magnitude of the star.

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Definitions:

Cortisol

A steroid hormone released by the adrenal glands in response to stress or low blood glucose; plays a key part in the body's stress response.

Heart Attack

A medical emergency involving the blockage of blood flow to the heart muscle, often resulting in damage to the heart.

High Levels

Typically refers to a greater than typical quantity, degree, or magnitude in a given context, such as high levels of anxiety or achievement.

Type A Personality

A personality type characterized by high levels of competitiveness, self-imposed stress, impatience, and urgency, often associated with a higher risk of heart disease.