Term
| In terms of nuclear reactions, what is the next stage of a star's life after the end of hydrogen burning in the core? |
|
Definition
| Hydrogen burning in a thin shell around the core |
|
|
Term
| The next stage in a star's life after the main sequence phase is |
|
Definition
|
|
Term
| The age of a cluster can be determined by |
|
Definition
| measuring the age of the stars that are still on the main sequence |
|
|
Term
| What are the main products of helium nuclear fusion in red giant stars? |
|
Definition
|
|
Term
| A planetary nebula is a(n) |
|
Definition
| expanding gas shell surrounding a hot, burned-out stellar core |
|
|
Term
| What process marks the end of a star's 'middle age' and moves it off of the main sequence? |
|
Definition
| The build up of inert helium in the core, which creates a hydrogen fusion shell. |
|
|
Term
| A planetary nebula is mostly made up of material from a star's |
|
Definition
|
|
Term
| What elements would you expect to make up the material of an expanding planetary nebula? |
|
Definition
| hydrogen, helium, carbon and oxygen |
|
|
Term
| A white dwarf is (in terms of luminosity and temperature compared with original star) |
|
Definition
| is hotter and less luminous than the star it came from |
|
|
Term
|
Definition
| is the core of a star which has ejected a planetary nebula |
|
|
Term
| Stars with between 0.4 and 8 solar masses will not fuse elements heavier than helium because |
|
Definition
| they will never create a high enough core temperature to fuse helium |
|
|
Term
| A star will only fuse elements heavier than Helium if |
|
Definition
| its core temperature gets hotter than about 600 million K |
|
|
Term
|
Definition
| ejected gas that will keep moving outward and will eventually become too thin to see |
|
|
Term
| The processes that cause the evolution of a star off of the main sequence have to do with |
|
Definition
| the fusion of elements other than hydrogen in the star's core |
|
|
Term
| Most stars in the universe will end their lives as |
|
Definition
|
|
Term
| As a star evolves to become a red giant it will become |
|
Definition
|
|
Term
| The first major stage in the aging of out sun will happen when |
|
Definition
| helium in the Sun's core pushes hydrogen fusion into a spherical shell around the core |
|
|
Term
|
Definition
| will eventually cool off and form black dwarfs |
|
|
Term
| Why does an aging star turn into a supernova? |
|
Definition
| The fusion of iron in the star's core pulls the material of the star inward, creating a blast wave which removes the outer part of the star |
|
|
Term
| Why does a star expand into a Red Giant? |
|
Definition
| the change of the core structure to allow hydrogen shell-burning changes the energy balance pushing the atmosphere outward. |
|
|
Term
| Why are Carbon and Oxygen a main component of planetary nebulae and supernova remnants? |
|
Definition
| They are products of helium fusion, the first stage of stellar evolution process |
|
|
Term
| Stellar death is important for stellar birth because |
|
Definition
The shock way from supernovae can cause gas clouds to collapse producing new stars
the heavy elements produced in the star's core adds to the variety of elements in the ISM |
|
|
Term
| What property of a star determined whether it will form a planetary nebula or supernova? |
|
Definition
|
|
Term
| Elements heavier than hydrogen |
|
Definition
| fuse at higher temperature than hydrogen and produce less energy |
|
|
Term
| On an H-R diagram, white dwarfs are |
|
Definition
|
|
Term
|
Definition
| some of the most energetic and violent processes in the universe |
|
|
Term
| What type of remnant will be produced by a high mass star (between 8 and 20 times the mass of the sun)? |
|
Definition
|
|
Term
| What type of remnant will be produced by a sun-like star (between than 0.4 and 8 times the mass of the sun)? |
|
Definition
|
|
Term
| What type of remnant will be produced by an ultra-low mass star ( smaller than 0.4 times the mass of the sun)? |
|
Definition
| a cold object made entirely of helium |
|
|
Term
| What type of remnant will be produced by an ultra-high mass star (larger than 20 times the mass of the sun)? |
|
Definition
|
|
Term
| What kind of nebula cannot be seen in visible light? |
|
Definition
|
|
Term
| What kind of nebula takes the form of an irregular shaped object with a strong blue color? |
|
Definition
|
|
Term
| What kind of nebula takes the form of strong, chaotic filamentary structure showing a variety of colors, with strong emissions in bands of the spectrum as high as X-rays? |
|
Definition
|
|
Term
| What kind of nebula takes the form of a spherical or hourglass shaped object with strong ted edges and possibly a greenish interior? |
|
Definition
|
|
Term
| What kind of nebula takes the form of an irregularly shaped object with a strong red color? |
|
Definition
|
|
