Having nothing to do with trigonometry, ________ parallaxes use the width of absorptionlines to estimate the star's luminosity and size and distance.
A)bolometric
B)photometric
C)spectroscopic
D)holographic
E)videometric

Question

Quizplus · Accepted Answer

Spectroscopic parallaxes use spectral analysis to estimate the luminosity, size, and distance of a star, by analyzing the width of absorption lines in its spectrum. Bolometric, photometric, holographic, and videometric parallaxes are not related to this method. Spectroscopic parallaxes use the width of absorption lines in a star's spectrum to estimate its luminosity, size, and distance. This method is based on the assumption that stars of the same spectral type have similar intrinsic widths of their absorption lines, allowing for a determination of the star's luminosity and size.

Having Nothing to Do with Trigonometry, ________ Parallaxes Use the Width