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Having nothing to do with trigonometry, what type of parallaxes use the width of absorption lines to estimate the star's luminosity and size and distance?

A.bolometric
B.photometric
C.spectroscopic
D.holographic
E.video metric


You can find the answer here:
http://www.astronomynotes.com/starprop/s13.htm
Reading it would be better than if I just told you the answer.

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