Option 3- Types Of Stars
By- Kamryn, Ann Katheryn and Landry
Due to not having an I-pad I could not access Thing-Link! :)
Low mass stars have masses less than half the mass of the sun, they are the smallest, coolest and the most dim of the main sequence stars. They are orange, red and brown in color. Low mass stars have long lives because they use up their hydrogen fuel very slowly.
The fate of a star depends on its mass. Low mass stars in their dying stages shed their outer layers transferring most of their mass into the interstellar medium, Low mass stars end up as white dwarf stars and eventually black dwarf stars.
High mass stars go through a similar process of low mass stars, but the process is much faster. High mass stars have a hydrogen fusion core, majority of the hydrogen fusion happens through the CNO cycle.After the hydrogen is exhausted, a helium core with a hydrogen shell forms, then a carbon core with helium and hydrogen shells. Unlike low mass stars, they have enough mass that gravity contracts the core raising the temperature and carbon can fuse into neon, then neon into oxygen, then oxygen into silicon, then iron. Each stage of burning lasts a shorter time than the previous one.
Although these stars have more hydrogen fuel to consume the sequence of events is much faster. The hydrogen burning takes place at a high rate to maintain the pressures to counteract the gravitational attractive forces. This results in the stars attaining higher temperatures and appearing brighter than low mass stars. Then comes the Red supergiant, Red supergiant interior, supernova, neutron star, and pulsars.
Very- Massive Stars:
Massive stars evolve in a similar way to a small star until it reaches its main sequence stage the stars shine steadily until the hydrogen has fused to form helium. The massive star becomes a Red Supergiant and starts off with a helium core surrounded by a shell of cooling. In the next million years a series of nuclear reactions occur from forming different elements in shells around the core.
Then, the star becomes a supernova, then it becomes a black hole.
The very massive star dies because it burns from the core to the outside.