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Astronomy 1102 gsu > Quiz 2 study questions > Flashcards

Quiz 2 study questions Flashcards

1
Q

hyper nova is a GammaRay bursts source that is thought to correspond to the formation of a black hole with very focused bipolar Jets true or false

A

True

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2
Q

The escape speed for a black holes event horizon is the speed of light True or false?

A

True

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3
Q

The key to identifying a black hole Candidate in a binary system is to find an unseen compact companion that has a mass greater than the limiting mass of a neutron star true or false

A

True

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4
Q

The shcwarzshild of a black hole depends on its what?

A

Mass

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5
Q

When a star like the supergiant in the x-ray binary Cygnus x-1 fills its critical gravitationally bound surface. It will have the shape of a

A

Egg

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6
Q

What is a neutron stars limiting mass

A

3 solar masses

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7
Q

The black hole in Cygnus x-1 has a mass of_solar masses

A

15

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8
Q

Stars with a mass below 8% of the Suns of mass are called

A

Brown dwarfs

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9
Q

Stars with a mass below 8% slowly fade away because their cores are not hot enough to burn what element

A

Hydrogen

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10
Q

As stars Age their cores contract in their outer envelopes expands true or false

A

True

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11
Q

Following the completion of core hydrogen burning what would the sun turn into next

A

Red giant

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12
Q

What two elements do stars like the sun fuse together

A

He into carbon

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13
Q

A star like the sun will spend most of its nuclear life as a?

A

Main sequence star

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14
Q

The larger the stellar mass the longer the lifetime of the star true or false

A

False

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15
Q

Stars like the sun will shine by nuclear reactions for_years

A

10 billion

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16
Q

Evolution is different and close binary stars because stars can exchange some of their mass true or false

A

True

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17
Q

The sudden collapse of the iron core of a star into a compact ball of neutrons leads to a?

A

Supernova explosion

18
Q

What is the upper limit for the mass of the white dwarf

A

1.4 solar masses

19
Q

Type one nova always occur in a close binary system true or false

A

True

20
Q

What is the likely progenitor of a type one supernova

A

A mass transfer binary

21
Q

Stars form in dark clouds of dust and gas the gas between those stars is called?

A

Interstellar medium

22
Q

What is interstellar medium

A

Gas between stars

23
Q

What is a dark nebula

A

A cloud that obscures our view

24
Q

What effect does interstellar dust have on stars

A

Makes them appear fainter and redder

25
Q

True or false gravity can create stars if it can overcome the force of thermal pressure?

A

True

26
Q

What would happen to a contracting cloud fragment if it were not able to radiate away it’s thermal energy?

A

Internal pressure would increase

27
Q

A protostar becomes a main sequence star once the core becomes hot enough for nuclear fusion. True or false

A

True

28
Q

Starlike objects massive enough to start fusion are called what

A

Brown dwarfs

29
Q

In the mirror principle a core contracts because?

A

Pressure decreases when hydrogen is too low for fusion

30
Q

When do subgiants become Giants?

A

When hydrogen is burning around a inert helium core. (Mirror principle)

31
Q

When does the mirror principle begin

A

When most of hydrogen burning has ended

32
Q

After hydrogen burns out what type of fusion begins to occur

A

Helium fusion

33
Q

Hydrogen turns to helium and helium turns into what.

A

Carbon

34
Q

After a multiple shell burning where many elements fuse in a shell the core of a star collapses and what happens?

A

A supernova explosion that leaves a neutron star or black hole

35
Q

What is the white dwarf

A

The dead core of a star

36
Q

A type 2 supernova is

A

The death or explosion of a massive star

37
Q

A type one nova is

A

The explosion of WD which is half the size of earth in a binary

38
Q

A neutron star is left behind by what

A

A massive star supernova or type 2

39
Q

What is the radius of a neutron star

A

10 km or 6 miles

40
Q

True or false all pulsars are neutron stars but not all neutron stars are pulsars

A

True

41
Q

A GammaRay happens when two neutron stars merge or

A

A hyper nova occurs

42
Q

When a star fills it’s critically gravitationally bound surface it begins to retain the shape of

A

An egg

Astronomy 1102 gsu (4 decks)

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