Question

question 19
1 pts
a binary star system that is detected from doppler shifted spectra is called
visual
spectroscopic
eclipsing

Explanation:

A spectroscopic binary star system is detected through Doppler - shifted spectra. Visual binaries are detected by direct visual observation (e.g., with telescopes), and eclipsing binaries are detected by the periodic dimming of light as one star eclipses the other. Since the question specifically mentions detection from Doppler - shifted spectra, the key concept here is spectroscopy (the study of spectra).

Answer:

spectroscopic