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Kapteyn's Star is classified as a spectral type M star. M stars are characterized by their cool temperatures and specific spectral features. Based on the characteristics of M stars, the correct answer for the spectral features of Kapteyn's Star would be:
**Strong titanium oxide and some calcium.**
This is because M stars typically exhibit strong titanium oxide (TiO) bands in their spectra, along with some absorption lines from metals like calcium.