Spectroscopic parallax is the a) distance to a star found by first observing the

Question

Spectroscopic parallax is the

a) distance to a star found by first observing the absorption lines in a star's spectrum to find the spectral type and luminosity class of the star

b) distance to a star found by first observing the apparent change in position of a nearby star compared to a distant background stars, due to the motion of the Earth around the Sun.

c) change in position of the absorption lines in a star's spectrum, caused by the star's motion around the center of mass in a binary system.

d) apparent change in position of the absorption lines in a star's spectrum, caused by the Earth's motion around the Sun.

Explanation / Answer

Answer: a) distance to a star found by first observing the absorption lines in a star's spectrum to find the spectral type and luminosity class of the star.

Reason: Spectroscopic parallax is one of the astronomical methods for measuring the distance to stars. This method is used to find out the luminosity of a star from its spectrum.

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