Which Two Physical Parameters of Stars Are Plotted on the Hertzsprung-Russell

question 86

Multiple Choice

Which two physical parameters of stars are plotted on the Hertzsprung-Russell diagram to show the systematics of a group of stars (e.g., a cluster) ?

• A) mass and apparent magnitude
• B) luminosity and radius
• C) luminosity and surface temperature
• D) surface temperature and mass

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Definitions:

z

A statistical measure that represents the number of standard deviations a data point is from the mean.

Normally Distributed Random Variable

A variable that follows a Gaussian distribution, characterized by its bell-shaped curve, where the mean, median, and mode are all equal.

Mean

The arithmetic average of a set of values or distribution.

Variance

A measure of the spread of a set of numbers, indicating how much the values differ from the mean of the set.