answer 13-16 with explanation mass dwaT Thh is a paradex bevaue ai gh mass stars
ID: 288217 • Letter: A
Question
answer 13-16 with explanation
mass dwaT Thh is a paradex bevaue ai gh mass stars eome giants before lew mass stars hi hoth stars are the same age so beth should be glants at the same time A s The binary star A leyol coassts ef a cool low mass giant and a hot, high mas et star, hare hower mass than cool stars Ms transfer in a binary star system may cause the mass donor star to b) FALSE Rlpe to the mass gainer star UE 1 Mass transfer to a white dwarf companiom a gascous acecretion disk. panion in a binary system will create a) TRUE D FALSE 16. a) TRUE Novae always occur in a close binary star system FALSE liicly progenitor of a type I supernova? uf 1.3 solar massesExplanation / Answer
13).
a).
• The 0.8 solar mass star once was more massive (3.0), with a 1.5 mass companion • As it became a red giant, it swelled and poured material onto its companion (lost 2.2) • The red giant (0.8) is now less massive than its companion (3.7)
14)
TRUE- Let’s consider a binary system in which one star (the “donor”) has filled its Roche lobe and is losing matter to the other star (the “gainer”). As this happens, the donor becomes less massive and the gainer becomes more massive, thereby changing the mass ratio of the system. With the changing mass ratio comes a changing gravitational potential, which in turn means that the Roche lobe itself changes as well.
15).
TRUE
1. Material accumulates onto
the white dwarf's surface,
increasing in temperature
and density.
2. At a temperature of 10
million K, the accumulated
surface hydrogen begins
nuclear fusion.
3. Nuclear fusion reactions cause
an enormous but temporary
increase in luminosity.
4. As nuclear fuel is burned up
or blown into space, fusion
ceases and the star dims.
16)
FALSE
Novae most often occur in the sky along the path of the Milky Way, especially near the observed galactic centre in Sagittarius; however, they can appear anywhere in the sky. They occur far more frequently than galactic supernovae, averaging about ten per year. Most are found telescopically, perhaps only one every year to eighteen months reaching naked-eye visibility.
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