Astronomy quiz question: smallest star?

Astronomy 210 Quiz 5, fall semester 2019
Cuesta College, San Luis Obispo, CA

Which star is the smallest?
(A) B5 white dwarf.
(B) M0 red dwarf.
(C) A5 main sequence star.
(D) F0 supergiant.
(E) (There is a tie.)

Correct answer (highlight to unhide): (A)

An H-R diagram is provided with this quiz.

These stars are plotted on an H-R diagram below. The F0 supergiant is the largest, followed by the A5 main-sequence star, M0 red dwarf, and the B5 white dwarf is the smallest, with a radius of just over 0.01× the radius of the sun.

Section 70160
Exam code: quiz05NpRm
(A) : 13 students
(B) : 8 students
(C) : 1 students
(D) : 0 students
(E) : 0 students

Success level: 63% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): –0.05

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