A particular star is found to have a very faint companion. When the spectrum of the companion is photographed and analyzed, it is found to contain absorption features of neutral potassium (K) and water (H₂O). Based on this information, the companion is a brown dwarf of spectral class:

Question

Quizplus · Accepted Answer

The presence of neutral potassium and water in the companion's spectrum indicates a cool temperature and low mass. This suggests that the companion is a brown dwarf. The spectral class of the brown dwarf is determined by its temperature, and the presence of neutral potassium and water places it in the T spectral class.

A Particular Star Is Found to Have a Very Faint