If we wanted to determine the temperature of a star, measurement of brightness of star at different filter we use.
Spectrography is a process in which the study of a particular chemical elements were determined by the measurements of wavelength of lights or by the insensity of the spectral line from the given matter.
Spectra of star i.e. stellar spectra looks like a black body means they will absorb all incident radiations on it. We can determine the temperature of the star by recording the brightness of the stars at two different filters and compare the ratio from red to blue light.
Hence by stellar spectra we determine the temperature.
To know more about stellar spectra, visit the below link:
https://brainly.com/question/1686867
