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hw4answers - Homework Assignment 4 Answers PHYS 206 The...

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Homework Assignment 4 Answers PHYS 206: The Milky Way Inside and Out In the following multiple choice items, there may be one or more correct answers. 1. Stellar Magnitudes : (a) represent fux. (b) represent the mass of a star. (c) are logarithmic, so that the diFerence (subtracting one magnitude ±rom another) represents the ratio o± two values. (d) represent the temperature of the star. (e) represent the age of the star. 2. Color: (a) is represented as the diFerence between two magnitudes. (b) is represented as the ratio of two magnitudes. (c) is directly related to the stellar luminosity (d) is directly related to the stellar Fux (e) is directly related to the stellar temperature (f) is directly related to stellar mass. 3. The Hertzsprung-Russell Diagram: (a) is a plot o± stellar luminosity vs. eFective temperature. (b) is a plot of stellar mass vs. age (c) when plotted as an optical color vs. magnitude, (d) revealed the existence o± the main sequence o± stars (e) was most signi²cant ±or revealing the existence o± the stellar main-sequence (±) aids our understanding o± stellar evolution (g) demonstrates that stars are powered by nuclear fusion. 4. The stellar “main-sequence”: (a) exhibits the progression in luminosity and temperature of a single star as it loses mass (b) exhibits the progression in luminosity and temperature of a single star as it gains mass (c) exhibits the observed relationship between luminosity and temperature o± stars o± many diFerent masses (d) exhibits the observed relationship of a single star as it evolves from being powered by nuclear fusion, through its giant and super-giant phases, toward a stellar endpoint. (e) includes proto-stars, dwarfs, giants, super-giants and white dwarfs. (±) includes only stars which are presently burning H. 5. Main-Sequence stars ±rst form: (a) as neutron stars in supernovae (b) as white dwarfs following planetary nebulae (c) in molecular clouds, through gravitational collapse (d) as black holes in supernovae 6. All of a main sequence star’s properties are fundamentally dependent on its: (a) age (b) luminosity (c) mass 1
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(d) temperature (e) color (f) magnitude 7. Select the listings in which the stages and/or phenomena associated with a low-mass star’s ( < 1.5 M ¯ ) evolution are in the correct chronological order: (a) white-dwarf, proto-star, main sequence, planetary nebula, giant (b) giant, main-sequence, planetary nebula, white dwarf, proto-star (c) proto-star, main-sequence star, giant, H-burning, planetary nebula, white dwarf (d) supernova, H-burning, proto-star, planetary nebula (e) proto-star, red dwarf, white dwarf, giant, super-giant, planetary nebula 8. Which of the following statements are true:
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hw4answers - Homework Assignment 4 Answers PHYS 206 The...

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