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Astronomy Evoiution of stars
Astronomy high mass, lowmass, binary stars quiz study
Terms in this set (20)
Star life cycles are in the hundreds of _________________ to _______________ of years.
Star life cycles are in the hundreds of __millions______ to _____billions__________ of years.
Some _____________________ have existed since the formation of the universe.
Some ______red dwarfs_______________ have existed since the formation of the universe.
Astronomers must put together a theory by taking "_________________" of stars, and piecing together a unified picture.
Astronomers must put together a theory by taking "___snapshots______________" of stars, and piecing together a unified picture.
Main sequence stars generate all their energy from the fusion of _____________ in their core. In low mass stars such as the sun, this is a _______ process.
As stars age, their luminosity and their radius ______________ (increase or decrease).
As hydrogen is fused, ____________ begins to collect in the core of the star and is surrounded by a ____________ shell.
helium, hydrogen burning shell
In the triple-alpha-process, the core continues to shrink and helium is eventually converted into ___________ & ___________ when the 2-step process is over.
Carbon and energy
The short period when the core is forced to expand is called the ___________ ______. During this stage, the luminosity and surface temperature increase significantly.
How much bigger should a star be (compared to our sun) in order to be considered a high mass star?
In the late stages of its life, the star's core goes through intermittent bursts of energy and in the process, it blows the outer envelope of the star into outer space. The resulting clouds of gas form a ______________ _____________ and the remaining core becomes a __________ ___________.
planetary nebula, white dwarf
In a low mass star, tell me the different elements that exist in the core as fusion continues throughout the stars lifetime.
Hydrogen, Helium, Carbon
Along those same lines, the temperature and pressure in the core is not strong enough to fuse carbon atoms, but we do see small amounts of ______________ formed at the inner boundary of the helium-burning shell.
When a main sequence star has grown and it's size is now 8 times its original size, it hasn't quite reached the size of a giant star so we would now refer to this as a _______________ star.
True or False: Supergiants tend to live much longer than Main Sequence stars because of their size (mass).
It is believed that eventually the white dwarfs will get so cool in temperature that they will stop giving off visible light. When this occurs, we would then refer to them as _____________________.
When high-mass stars (8-12x the size of the sun) reach the end of their life cycle, they go through a nebula phase and end up as a ______________________.
Neon Oxygen White Dwarf
The stars in a binary system have a region around them in which the star has complete control over the matter within it. This region is known as a __________________.
In low mass stars, they will finish with _____________ ash in their core, while large high mass stars will end their life cycle with ___________ in their core.
Helium ash, Iron
The point at which the gravitational forces between the two Roche lobes are equal is called a __________________.
If one or both stars expand sufficiently, their atmospheres may merge. The result are two stellar cores sharing a common atmosphere. This is now called a ________________________.
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