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.
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