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astro_HW_05 (1).pdf - PHY LCW – Astrophysics D.Paradis...

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PHY LCW – AstrophysicsD.ParadisAssignment #5: Galaxies1)The Densitya)The mass density of Stars in the neighbourhood of the Sun isapproximately305.0pcMSun. Assuming that the mass density is constantand that all of the stars are main sequence M stars, estimate the fraction of theGalactic disk’s volume that is occupied by stars.b)Suppose that an intruder star (a main sequence M star) travelsperpendicularly through the Galactic disk. What are the odds of the intrudercolliding with another star during its passage through the disk? Take thethickness of the disk to be approximatelykpc1.[For a main sequence M star take:SunSunMMRR31&21**]2)Considering that the Sun is approximatelykpc0.8from the center of the Milky
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Term
Fall
Professor
JohnHSLee
Tags
White dwarf, mass density of Stars

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