By What Standard Technique Did Astronomers in the 1930s Originally

question 207

Multiple Choice

By what standard technique did astronomers in the 1930s originally determine the luminosity class (I, II, III, IV, or V) of a star?

• A) combining the apparent magnitude with the measured distance to the star
• B) observing the diameter of the star on a photographic plate or CCD image
• C) timing how long it takes for the star to be eclipsed by a companion in an eclipsing binary star system
• D) studying the absorption lines in the star's spectrum

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Ethical frameworks or theories that present moral standards guiding right or wrong conduct.

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A principle or action taken based on understanding and empathy towards the needs and suffering of others.

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The moral principles that govern a person's behavior or the conducting of an activity, often underpinning professional standards and practices.