6. Stellar populations in the Milky Way (6x3-18 marks (a) Population I stars are

Question

6. Stellar populations in the Milky Way (6x3-18 marks (a) Population I stars are (b) Population II stars are (c) The most stars in the Galaxy common are (d) The brightest stars in the Galaxy are (e) How do we detect the presence of gas in the Galaxy? (f) How is the distance of the Sun to the Galactic centre estimated? (8) How is the velocity of the Sun around the Galaxy estimated? Since we will probably run out of time to cover this topic in lectures, it is not examinable here or in the exam (but see lecture slides and full solutions to these problems if you are curions! problens if you are curionell

Explanation / Answer

a) Population I stars include the sun and tend to be luminous , hot and young and concentrated. They are particularly found in the spiral arms.

b) Population 2 stars tend to be found in globular clusters and the nucleus of a galaxy . They tend to be older , less luminous and are cooler than Population 1 stars

c) The most common type of star in the galaxy is red dwarf

d) The brightest star in the galaxy is sirius

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