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Studies of a star’s position made on the same calendar date over subsequent years yield __________ .

Visible sunspots lie in the

Only A type stars show hydrogen lines in their spectra.

While the photosphere produced chiefly visible light, most coronal energy is in the form of __________ .

A star near the lower right of the H-R diagram is likely to be

High mass stars are typically found on the ___________ of the main sequence.

To find the __________ velocity, we must combine proper motion and parallax data.

In general, the more massive the star, the longer its lifetime.

The _____________ magnitude of a star depends on its luminosity and distance from us.

The strongest lines present in spectral class A stars are absorption lines of __________ .