WorksheetsStellar Evolution
Total questions: 10
Worksheet time: 10mins
Stars can take different evolutionary paths due to their initial:
Brightness
Mass
Temperature
Color
Helium flash occurs:
In very massive stars
When the helium nucleus breaks its degeneracy
At the Asymptotic Giant Branch phase
when the nucleus burns helium
Which following states regarding the main sequence is wrong?
Main sequence undergo fusion hydrogen within their cores.
Mass is the key factor to determine the lifespan of the star
The energy is transported via radiation or convection
Hydrogen burns in a shell
Which following evolutionary sequence is correct?
PMS-AGB-RGB-BH
MS-HB-RGB-AGB-SN-WD
MS-RGB-HB-AGB-PN-WD
MS-RGB-HB-AGB-SN-WD
When a red giant's outer atmosphere drifts away, it becomes:
Expanding nebula
Planetary nebula
White dwarf cloud
Planetary cloud
Why will a low/medium mass star will never create a Black Hole
Collapse is too slow
Collapse is too fast
Electron degeneracy
Proton degeneracy
Stars like the Sun probably do not form iron cores during their evolution because
All the iron is ejected when they become planetary nebulas.
Their cores never get hot enough.
Their strong magnetic fields keep their iron in their atmospheres.
The iron converted in heavier elements through proton capture
At the RGB stellar evolution phase the stars have a degenerate core and fuse helium in a shell
True
False
There are evidences that at the center of galaxies live:
Super massive black hole
Stellar black hole
Cosmic black hole
Compact star
At the late stage of a low mass star evolution the outer layers escape into space, leaving behind a:
White dwarf
Neutron star
Red giant
Supernova
