Respuesta :
Answer:
Chemical composition, Temperature, Radial velocity, Size or diameter of the star, Rotation.
Explanation:
Elemental abundances are determined by analyzing the relative strengths of the absorption lines in the spectrum of a star.
The Spectral class to which the star belongs gives the information related to the temperature of the star. It is the spectral lines that determine the spectral class O B A F G K M are the spectral classes.
By measuring the wavelengths of the lines in the star's spectrum gives the radial velocity. Doppler shift is the method used to find the radial velocity.
A star can be classified as a giant or a dwarf . A giant star will have narrow width spectral lines whereas a dwarf star has wider spectral lines.
Broadening of the spectral lines will determine the star's rotation.
The five characteristics that can be determined by measuring it's spectrum Doppler shift, temperature, size, composition, and rotation.
Characteristics of stars using spectrum
- Rotation: The star's rotation creates a broadening of the spectral lines, which can be used to determine the star's rotation.
- Temperature: Measure the relative strengths of spectral lines to determine a star's spectral class which corresponds to temperature.
- Doppler shift: The Doppler shift of the star is determined by its radial velocity.
- Size: Measure the width of spectral lines. If the lines are narrow, the star's diameter is large. If the lines are wider, the star's diameter is smaller.
- Composition: Computer models and temperature are used to determine elemental abundances from relative strengths of absorption lines in a star's spectrum.
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