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The image is a close-up of a small green object that appears to be a supernova fragment. Credit: NASA/CXC/UC Berkeley/J.Tomsick et al & ESA/XMM-Newton.

Star fission is a lecture about a specific theory from astrophysics for the origin of binary or multiple star systems. It is an original research project and part of the radiation astronomy department. It has been included in the course on the principles of radiation astronomy.

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Quiz

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1 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

2 Complete the text:

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

lead many objects to

and then reaccrete.

3 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 mechnical energy by conversion to heat
low viscosity
elasticity

4 True or False, 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.

TRUE
FALSE

5 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

6 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

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

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

TRUE
FALSE

9 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

.

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

TRUE
FALSE

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

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

Yes
No

13 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

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

regions.

15 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.

16 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

.


See also

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{{Principles of radiation astronomy}}

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