Which of the following is a method for measuring the diameter of a star?
A) watching the body of the Moon go across the star
B) getting the light curve of an eclipsing binary star
C) comparing the color of a star seen high above our heads and then again when it's near the horizon
D) measuring the spectrum of a spectroscopic binary
E) more than one of the above

Question

Quizplus · Accepted Answer

Both A (watching the body of the Moon go across the star) and B (getting the light curve of an eclipsing binary star) are methods that can be used to measure the diameter of a star. Option A involves using lunar occultations to measure a star's size by observing how long it takes for the star to be covered or uncovered by the Moon. Option B involves analyzing the light curve of an eclipsing binary system to determine the sizes of the stars based on how the light from the system dims when one star passes in front of the other.

Which of the Following Is a Method for Measuring the Diameter