It is a spectral type M star. Using the table above, what spectral features does Kapteyn's Star have?

Question

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1 point
Helium, some hydrogen
Strong titanium oxide and some calcium
Hydrogen and ionized metals such as calcium and iron
Both metals and ionized metals, especially ionized calcium

Answer 1

Kapteyn's Star is classified as a spectral type M star, which indicates that it primarily exhibits features such as strong titanium oxide (TiO) bands and some molecular features. Based on the options provided, the correct spectral features for Kapteyn's Star would be:

Strong titanium oxide and some calcium.

M stars are known for their strong TiO absorption bands, which are a characteristic feature of cooler stars in this spectral class.