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5154A....might be one of the Fe lines, although B class stars (which eta probably is...most likely B0 on the assumed temp) don't normally show such strong Fe lines. Fe and Ca II (H and K) lines are usually associated, and normally appear strongly in the cooler classes....namely F, G and K. Usually from about F4 to K5-6, where after they diminish in favour of the strong metal oxide and hydroxyl lines (all molecular lines instead of the monatomic lines). Before then, they lose intensity and the hydrogen lines begin to dominate.
Although, if these spectra are coming from the nebula as well, you'll be getting the other lines mixed in with the pure spectrum from the star.
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