Astronomy quiz question: hottest star?

Astronomy 210 Quiz 5, spring semester 2016
Cuesta College, San Luis Obispo, CA

Which star is the hottest?
(A) A0 white dwarf.
(B) M0 red dwarf.
(C) G5 main-sequence star.
(D) B5 main-sequence star.
(E) (There is a tie.)

Correct answer (highlight to unhide): (A)

An H-R diagram is provided with this quiz.

Using the OBAFGKM spectral type mnemonic, or reading off of an H-R diagram (provided on this quiz, as below), the B5 main-sequence star is the hottest star, followed by the A0 white dwarf, then the G5 main-sequence star, while the M0 red dwarf is the coolest.

Section 30674
Exam code: quiz05nUL7
(A) : 2 students
(B) : 1 student
(C) : 3 students
(D) : 15 students
(E) : 0 students

Success level: 70% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.35

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