Question

what is a star? Explain the entire process from birth to death of a star.​

Answer 1

Answer:

$Birth$

of a star means that the collapsing clump of gas and dust (proto star) inside a nebula, has started nuclear fusion. If the mass of the collapsing clump is less than 80 times jupiter's mass, it fails to become a star and becomes a brown dwarf. Collapse inside a nebula is triggered due to death of a star (supernova explosion) somewhere else which sends shock waves and/or gas and dust to cause accretion. (so we have generations of stars. later generations with heavier elements)

$Death$

of a star occurs when nuclear reactions cease.

• less that 8 solar mass: When hydrogen gets over, gravity collapses the core of star for helium fusion to produce carbon and oxygen. By the time a planetary nebula is formed, all nuclear reactions cease and it meets a carbon death. The dead star cools to become white dwarf and later black dwarf
• more than 8 solar mass: Carbon in the previous stage fuses into neon and magnesium, and oxygen into silicon and sulfur. Silicon and sulfur than fuse into an iron core. The core collapses without nuclear reaction for sometime into such degree that all protons and electrons fuse to become neutrons. There goes a supernova explosion leaving behind a dead neutron star. It may than become a pulsar or if the solar mass was more than 15 we get a black hole.

Explanation:

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