1. What happens to Cepheid variable stars when they brighten and fade repeatedly
ID: 289643 • Letter: 1
Question
1. What happens to Cepheid variable stars when they brighten and fade repeatedly? A)They burn types of fuel they did not burn before B)They precess more strongly (wobbling) C) They expland and shrink D) They gradually turn inside out
2. How fast do the most luminous (brightest) Cepheid stars pulsate compared to the dimmer ones? A) MOre quickly with short periods B) Most slowly with long periods
3)What is the name for tear-drop shaped regions around a pair of binary stars that indicate which areas are controlled by the gravity of each star? A) Centers of mass B) Barycenters C) Orbits D) Star horizons E) Ellipses F) Roche lobes
4)When a star like our Sun finally dies, its core will shrivel up to become a tiny “white dwarf,” while the outer layers of the star will eject into space, producing a nebula. What is the name for this type of nebula. Do not simply mention an example of one. A) Protoplanetary disk B) Ring Nebula C) Plantary nebula D) Hourglass nebula E) Emission nebula
5)The Chandrasekhar Limit is a limit on the maximum mass that a certain kind of dead star is allowed to have. What is this type of dead star? A) main sequence star B) black dwarf C) whote dwarf D) a.4M E) Neuton star
Explanation / Answer
1. C) They expand and shrink.
Cepheid variable stars are pulsating stars with fluctuating brightness. They shrink when they are dim(decreased brigtness) and expand or swell when they brighten again.
2. A) More quickly with short periods.
Cepheid variable stars are very luminous stars with short periods of change(ranging from 1-100days).
3. F) Roche lobes
Roche lobes are almost tear-drop shaped regions around a pair of binary stars bounded by a particular equipotential surface.
4. C) Planetary nebula.
Planetary nebula forms when a star( like our Sun) after running of of its fuel(mainly Hydrogen and Helium) to burn finally blows off its outer layers.
5. C) White dwarf.
The Chandrasekhar Limit is a limit on the maximum mass a white dwarf star is allowed to have.
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