Question 1:The CNO

cycle,

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Review Quiz No. 13

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1. involves the fusion of Carbon, Nitrogen, and Oxygen into heavier elements.

2. involves the fission of Carbon, Nitrogen, and Oxygen into nuclei of Helium and Hydrogen.

3. involves the fusion of 4 Hydrogen nuclei into Helium.4. involves the fission of Helium into 4 Hydrogen nuclei.5. involves the fusion of Helium nuclei into Carbon,

Nitrogen, and Oxygen nuclei.

Question 2:In a binary system

consisting of an 0.5-solar-mass star and an 8-solar-mass star, the 0.5-solar-mass star is

orbiting around …

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1. the center of the 8-solar-mass star.2. the center of the 0.5-solar-mass star.3. the mid-point halfway between the two

stars.4. the center of mass, located rather close

to the 0.5-solar-mass star.5. the center of mass, located rather close

to the 8-solar-mass star.

Question 3:In a binary system, you observe two

stars orbiting each other with a period of 2 years at a distance of 4 AU from each other. If one of the stars has a mass of 1 solar mass, the other star

must have a mass of …

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1. 1 solar mass.2. 2 solar masses.3. 15 solar masses.4. 16 solar masses.5. Impossible to tell with the

available information.

Question 4:In a spectroscopic

binary, the parameters (P, a) are measured

indirectly by observing

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1. periodically shifting patterns of stellar absorption lines.

2. periodically shifting patterns of stellar emission lines.3. periodically disappearing and re-appearing stellar

absorption lines.4. periodically disappearing and re-appearing stellar

emission lines.5. a pair of stars periodically eclipsing each other.