Star A is a main sequence star of spectral type $\mathrm { F 2}$ ad star B is a white dwarf of spectral typeB4. Which statement below is correct?
A)Star A appears brighter than star B.
B)Star B appears brighter than star A.
C)Star A is hotter than star B.
D)Star B is hotter than star A.
E)None of the above can be said about these two stars.

Question

Quizplus · Accepted Answer

Star B, being a white dwarf of spectral type B4, is hotter than Star A, a main sequence star of spectral type F2. Spectral type B stars are hotter than spectral type F stars, regardless of their luminosity class (main sequence or white dwarf).

Star a Is a Main Sequence Star of Spectral Type F2\mathrm { F 2}F2

Star a Is a Main Sequence Star of Spectral Type $\mathrm { F 2}$