Astronomy quiz question: A5 supergiant vs. A5 white dwarf

Astronomy 210 Quiz 5, fall semester 2017
Cuesta College, San Luis Obispo, CA

An A5 supergiant and an A5 white dwarf could have the same:
(A) luminosity.
(B) size.
(C) temperature.
(D) (Two of the above choices.)
(E) (All of the above choices.)
(F) (None of the above choices.)

Correct answer (highlight to unhide): (C)

An H-R diagram is provided with this quiz.


These stars are plotted on an H-R diagram below. While the A5 giant is both larger and more luminous than the A5 white dwarf, they will have the same temperature, as they have the same spectral type.


Section 70158
Exam code: quiz05Sbn3
(A) : 2 students
(B) : 0 students
(C) : 37 students
(D) : 4 students
(E) : 0 students
(F) : 0 students
(No response: 1 student)

Success level: 85% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.50

Section 70160
Exam code: quiz05n3Rw
(A) : 2 students
(B) : 2 students
(C) : 21 students
(D) : 0 students
(E) : 1 student
(F) : 2 students

Success level: 76% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.63