Astronomy quiz question: hottest star?

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

Which star is the hottest?
(A) A5 main sequence star.
(B) F0 supergiant.
(C) B5 white dwarf.
(D) M0 red dwarf.
(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 M0 red dwarf is the coolest, followed by the F0 giant, A5 main-sequence star, and the B5 white dwarf is the hottest, with a temperature of just under 20,000 K.

Section 70158
Exam code: quiz05Sh0w
(A) : 1 student
(B) : 2 students
(C) : 22 students
(D) : 2 students
(E) : 1 student

Success level: 77% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.75

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