Stars/Evolutions/Quiz

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Doppler maps are of the highly active star BO Mic ('Speedy Mic') at different rotation phases (indicated on top of the maps). Credit: ESO, European Southern Observatory.

Stellar evolution is a lecture about a specific theory from astrophysics for the origin and accumulated changes of star systems. It is an offering from the radiation astronomy department.

You are free to take this quiz based on stellar evolution at any time.

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Quiz[edit | edit source]

  

1 Yes or No, Cosmogony is any scientific theory concerning the coming into existence, or origin, of the cosmos or universe, or stars came to be.

Yes
No

2 Piezonuclear reactions associated with fission may include

occurring in inert and non-radioactive elements
high pressure
brittle fracture
solids under compression
low-energy reactions
take place in nuclei with an atomic weight ≤ iron

3 Yes or No, The formation of exponential disks is an outstanding problem in cosmogony.

Yes
No

4 Complete the text:

Yarkovsky–O'Keefe–Radzievskii–Paddack (YORP)

lead many objects to

and then re-accrete.

5 Chemical and physical phenomena that may be associated with core formation are

a deficiency of some noble metals in the crust of the Earth
leaching by metallic iron
a liquid Earth
a loss of mechanical energy by conversion to heat
low viscosity
elasticity

6 Yes or No, While fusion may be the primary mechanism by which first generation stars produce energy, repulsion between like nucleons may cause neutron emission from a collapsed core.

Yes
No

7 Which of the following is not a prominent feature associated with solar clouds?

coronal mass ejections
magnetic clouds
rotation
coronal clouds
plasma
magnetic field lines

8 True or False, In the evolution of elements much more material has gone into the even-numbered elements than into those which are odd.

TRUE
FALSE

9 In general there is no proper motion at all in the plage or the surrounding?

10 True or False, "Some prominences break apart and give rise to coronal mass ejections."

TRUE
FALSE

11 It is important to study the stellar populations of nearby galaxies in order to understand the processes of galaxy

.

12 Complete the text:

"When a prominence is viewed from a different perspective so that it is against the

instead of against space, it appears

than the surrounding

.

13 True or False, With respect to the core of the Sun, the high-hydrogen, low-iron model was suddenly adopted without opposition.

TRUE
FALSE

14 About one third of ejecta observed by satellites at Earth is composed of what?

15 Yes or No, A spotless flare may occur in a plage region during its first rotation.

Yes
No

16 Nuclear fission and nuclear fusion may be connected by which of the following?

means for concentrating actinide elements and for separating actinide elements from reactor poisons exist
thermonuclear fusion reactions in stars are ignited by nuclear fission energy
dark matter
the feasibility of thermal neutron fission and fast neutron fission in planetary and protostellar matter may be calculated from nuclear reactor theory
brown dwarfs

17 For a few special cases, rotational velocities for protostars have been obtained directly from observations of the outer optically

regions.

18 True or False, The overdense regions having turned into dark population III objects.

TRUE
FALSE

19 Complete the text:

In the case of B335,

is not important in determining the

balance in the outer regions, and this object is in fact undergoing

collapse.

20 Complete the text:

Match up the likely type of star fission with each of the possibilities below:
a triple-component stellar multiple - A
massive star fission - B
semidetached binary - C
a separating close contact binary - D
ZAMS system - E
tight, circular orbit, impossible to tell eclipses - F
lobate star - G
coronal mass ejection - H
BH Centauri

.
Plaskett's Star (HR 2422)

.
Betelgeuse

W Ursae Majoris

.
Beta Lyrae

.
V1010 Ophiuchi

object is confirmed to be co-moving

.
Sun

.

21 True or False, The temperature of the cores of stars may be determined by the balance between the gravitational attraction and the gas pressure.

TRUE
FALSE

22 Which of the following are characteristic of a binary formed via gravitational fragmentation?

the local Jeans length
the local speed of sound
the mean molecular weight
the electron neutrino
the mean particle density
neutrons

23 Which of the following are likely phenomena associated with population III stars

not enough of them
individual masses must either be less than 0.1 M⊙
clouds
in the range 103–106 Μ⊙
too much background light
too much material
heavy elements

24 Complete the text:

Match up the item letter with each of the cosmogonic possibilities below:
interior models of the giant planets - A
high interest for cosmogony, geophysics and nuclear physics - B
hierarchical accumulation - C
clouds and globular clusters - D
cosmic helium abundance - E
deuterium fusion - F
a large deficiency of light elements - G
after galactic sized systems had collapsed - H
the motions of hydrogen

formation of luminous quasars

.
stars with an initial mass less than the solar mass

.
rotating liquid drops

.
primordial is less than 26 per cent

.
a solar mixture of elements dominated by hydrogen and helium gas

.
around 13 Jupiter masses

.
smaller rocky objects

.


See also[edit | edit source]

External links[edit | edit source]

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