GENERAL KNOWLEDGE

Detailed explanation-1: -The science of spectroscopy is quite sophisticated. From spectral lines astronomers can determine not only the element, but the temperature and density of that element in the star. The spectral line also can tell us about any magnetic field of the star. The width of the line can tell us how fast the material is moving.

Detailed explanation-2: -Spectroscopy is used to identify the elements of a star. In an atom when an electron jumps from higher to lower energy level, it emits radiation. The elements emit a discrete spectrum. Each of the elements has different atomic spectra.

Detailed explanation-3: -A star’s spectrum contains information about its temperature, chemical composition, and intrinsic luminosity. Spectrograms secured with a slit spectrograph consist of a sequence of images of the slit in the light of the star at successive wavelengths.

Detailed explanation-4: -Most stars found in the Galaxy are chemically very similar to the Sun, approximately 74 percent hydrogen, 24 percent helium, and 2 percent all other elements (all elements heavier than helium are conventionally grouped together under the term metals).