Question

An astronomer is observing a star which puzzles her. The lines in the star's spectrum indicates that the star is very hot and should therefore be blue. But the star looks reddish in photographs and in measurements of the continuous spectrum. What is one possible explanation of this puzzle

Answer 1

One possible explanation is interstellar reddening, where interstellar dust dims and reddens the light from hot stars, causing them to appear red instead of blue.

Step-by-step explanation:

One possible explanation for the star appearing reddish despite the indication of hot temperature in its spectral lines is interstellar reddening. Interstellar dust can dim and redden the light from hot stars, making them appear redder than they actually are. This phenomenon is known as interstellar reddening and it explains the discrepancy between the expected blue appearance and the observed red appearance in photographs and measurements of the continuous spectrum.

Answer 2

the stars which are red in color are cool.

Step-by-step explanation:

The stars which has reddish color are cool in nature while those stars which has white and blue in color are very hot in nature. The stars change its color when they becomes hotter , first the star color reddish when they are cool but with increasing temperature it changes the color from reddish to orange then yellow. After yellow it turns green and finally get blue color when the stars are very very hot.