Use the absorption line strengths shown in Figure 10-5 and Table 10-1 of Comins,Discovering the Essential Universe,6th ed.,to determine the spectral class of a star with the following absorption lines in its spectrum: H lines moderately strong; He I lines present; no Ca II,Fe II,or He II lines.
A) M
B) B
C) F
D) A

Question

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The Answer of Use the absorption line strengths shown in Figure 10-5 and Table 10-1 of Comins,Discovering the Essential Universe,6th ed.,to determine the spectral class of a star with the following absorption lines in its spectrum: H lines moderately strong; He I lines present; no Ca II,Fe II,or He II lines.
A) M
B) B
C) F
D) A

Use the Absorption Line Strengths Shown in Figure 10-5 and Table