a. Variable stars can be used to estimate the distance to astronomical objects which contain them....

a. Variable stars can be used to estimate the distance to astronomical objects which contain them. If there is a signiﬁcant amount of dust in the line of sight, these stars will appear fainter in the optical than what really are. What would happen to the distance estimate if one does not correct for the presence of dust extinction? Explain qualitatively.

b. Do weak encounters signiﬁcantly aﬀect the trajectory of a star in a galaxy?

c. Two astronomical sources have exactly the same luminosity, but one is located in the nearby Universe and the other one at z = 1. What would be approximately the ratio between their surface brightenesses?
d. Ennumerate two main star formation tracers in galaxies.

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I have explained the answer thoroughly. Please feel free to ask me if you have any confusion or if you need further clarification regarding this problem.

genius_generous answered 1 year ago

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