What are the approximate spectral classes of stars with the following characteristics?
balmer...
What are the approximate spectral classes of stars with the following characteristics?
balmer lines of hydrogen are very strong; some lines of ionized metals are present.
the strongest lines are those of ionized helium.
lines of ionized calcium are the strongest in the spectrum; hydrogen lines show only moderate strength; lines of neutral and metals are present.
the strongest lines are those of neutral metals and bands of titanium oxide.
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