Astromony Help!! Indicate whether the following statements are true or false. (S
ID: 1552454 • Letter: A
Question
Astromony Help!!
Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F. enter TFFFFF). A) Novae are probably binary systems consisting of a white dwarf and a Red Giant star. B) When a nova occurs, a neutron star is typically left behind. C) A nova is when a star explodes at the end of its life. D) A nova is the same as a planetary nebula. E) The nova outburst is caused by the buildup of hydrogen on the surface of a white dwarf, which eventually ignites when the pressure and temperature are high enough. F) Novae can be recurrent (that is, the same star has repeated outbursts). Indicate whether the following are properties of Type Ia or Type II supernovae. (Select 1-Type Ia, 2-Type II. If the first is 1 and the rest 2. enter 12222222) A) Can occur in stars that are not in a binary system. B) Produces very heavy elements like Uranium during the explosion. C) Usually as a brighter peak luminosity. D) Can only occur in a galaxy with ongoing star formation. E) Could completely explode and leave no remnant behind. F) Caused by core collapse of a massive star. G) Supernovae of this type have the same peak luminosity. H) The spectrum shows very little Hydrogen.Explanation / Answer
A) This is true. They are likely created in a close binary star system consisting of a white dwarf and either a main sequence, sub-giant or red giant star.
B) This is false. Neutron star is formed when a giant star dies in a supernova.
C) This false. Nova is an astronomical event that causes the sudden appearance of a bright "new" star, that slowly fades from view over several weeks or many months.
D) False. Planetary nebulas are formed when a low mass star dies.
E) This is true. When the orbital period falls in the range of several days to one day, the white dwarf is sufficiently close to its companion star to start drawing accreted matter onto the white dwarf's surface, which creates a dense but thin atmosphere. This mostly hydrogen atmosphere is thermally heated from the hot white dwarf star, which eventually reaches a critical temperature, and results in a rapid runaway ignition by fusion. From the dramatic and sudden energies created, the now hydrogen-burnt atmosphere is then dramatically expelled into interstellar space, whose brightened envelope is seen as the visible light created from the nova event.
F) This is true.
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