Astronomy 210 Quiz 6, Fall Semester 2010
Cuesta College, San Luis Obispo, CA
Evidence that halo population stars are older than disk population stars is that halo population stars:
(A) contain dark matter.
(B) are less massive.
(C) have dimmer luminosities.
(D) have fewer absorption lines.
Correct answer: (D)
Each element will produce its own characteristic set of absorption lines. A star that had formed recently will be metal-rich, and have many absorption lines, while a star that had formed a long time ago will be metal-poor, and have fewer absorption lines.
Section 70158
(A) : 2 students
(B) : 8 students
(C) : 12 students
(D) : 22 students
"Success level": 53% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.34
Section 70160
(A) : 4 students
(B) : 4 students
(C) : 6 students
(D) : 23 students
"Success level": 66% (including partial credit for multiple-choice)
Discrimination index (Aubrecht & Aubrecht, 1983): 0.71
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