Yes, an astronomer may identify whether a star is a main-sequence star by measuring the wavelength of the peak of the star's spectrum. Using a spectrometer, an astronomer measures the absorption spectra of a star.
An astronomer is a scientist in the discipline of astronomy who concentrates their research on a particular issue or area outside the realm of Earth. Astronomers monitor celestial bodies including stars, planets, moons, comets, and galaxies using either observational (by interpreting the data) or theoretical methods.
A periodic wave's wavelength, or the distance over which the wave's shape repeats, is its spatial period. It is the separation between adjacent spots on a wave that correspond to the same phase called wavelength.
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