Table of Contents
How do main sequence stars form?
Stars start their lives as clouds of dust and gas. Gravity draws these clouds together. But if the body has sufficient mass, the collapsing gas and dust burns hotter, eventually reaching temperatures sufficient to fuse hydrogen into helium. The star turns on and becomes a main sequence star, powered by hydrogen fusion.
Which of the following lists the stages of life for a low-mass star in the correct order?
Which of the following lists the stages of life for a low-mass star in the correct order? protostar, main-sequence star, red giant, planetary nebula, white dwarf. the core shrinks while the rest of the star expands.
What is the main sequence What basic property of a star determines where it lies on the main sequence?
What basic property of a star determines where it lies on the main sequence? A star’s mass will determine where it lies on the main sequence. The most massive stars are in the upper left end while the lowest mass stars are in the lower right end.
What must occur for an object to be considered a main sequence star?
What must occur for an object to be considered a main sequence star? Hydrostatic equilibrium, and Nuclear fusion reaction in the core. Higher mass stars burn through their nuclear fuel faster.
What is the main sequence in astronomy?
In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell.
When do high mass stars leave the main sequence?
High-mass stars, like all stars, leave the Main Sequence when there is no more hydrogen fuel in their cores. The first few events are similar to those in lower-mass stars – first a hydrogen shell, then a core burning helium to carbon, surrounded by helium-and hydrogen-burning shells.
How is the evolution of stars similar to the Sun?
The first few events are similar to those in lower-mass stars – first a hydrogen shell, then a core burning helium to carbon, surrounded by helium-and hydrogen-burning shells. 12.4 Evolution of Stars More Massive than the Sun Stars with masses more than 2.5 solar masses do not experience a helium flash – helium burning starts gradually.
How are stars formed and how are they formed?
Stars form from large clouds of dust and gas particles (nebulae) that are drawn together by gravitational forces over millions of years. As the particles get closer the temperature and pressure becomes so large that nuclear fusion of hydrogen nuclei to helium nuclei occurs.
What happens to the mass of a sun like star?
By the time of the helium flash, a Sun-like star of initial mass 1.0 M Sun may have only 0.7 M Sun remaining. By the time the star has completed its nuclear fusion, there will be a significant amount of expelled gas from its envelope in its immediate vicinity.