What critical event transforms a protostar into a normal main-sequence star?

What determines if a star is on the main sequence?

In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. … During this stage of the star’s lifetime, it is located on the main sequence at a position determined primarily by its mass, but also based upon its chemical composition and age.

How long does it take for a protostar to become a main sequence star quizlet?

How long does it take for a protostar to become a main-sequence star? anywhere from less than a million years to 100 million years, depending on the mass of the star. What are the stages in order of the life track of a star like a Sun?

What is the typical main sequence lifetime of a M type star?

The lifetimes of main sequence stars therefore range from a million years for a 40 solar mass O-type star, to 560 billion years for a 0.2 solar mass M-type star.

What happens as a protostar contracts?

What happens as a protostar contracts? Its density rises. Its temperature rises. … When winds blow the gas away from a forming protostar it becomes visible as a T Tauri star.

What is the main sequence stage?

Main-Sequence Lifespan

The main sequence is the stage where a star spends most of its existence. Relative to other stages in a star’s “life” it is extremely long; our Sun took about 20 million years to form but will spend about 10 billion years (1 × 1010 years) as a main sequence star before evolving into a red giant.

Are more massive stars hotter?

The more massive main sequence stars are hotter and more luminous than the low-mass main sequence stars. … For example, an O-type star can be only 20 times more massive than the Sun, but have a luminosity about 10,000 times as much as the Sun.

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At what stage of evolution do T Tauri stars occur?

Stage 4

What can we learn about a star from a life track on an HR diagram?

What can we learn about a star from a life track on an H-R diagram? The surface temperature and luminosity the star will have at each stage of its life. When does a protostar become a main-sequence star?

What happens when a main sequence star exhausts its core hydrogen fuel supply?

What happens when a main-sequence star exhausts its core hydrogen fuel supply? The core shrinks while the rest of the star expands. The main source of energy for a star as it grows in size to become a red giant is: Hydrogen fusion in a shell surrounding the central core.

What is the most famous G type star?

type G2V

Which is the most common type of star?

Red dwarf stars

What type of stars are the most common quizlet?

What are actually the most common types of stars? The most common types of stars observed are high luminosity O and B main-sequence stars as well as giants and supergiants. The most common types of stars, though, are lower main-sequence M-class stars (red dwarfs) and white dwarfs.

What determines how long a star will live?

A star’s life expectancy depends on its mass. Generally, the more massive the star, the faster it burns up its fuel supply, and the shorter its life. The most massive stars can burn out and explode in a supernova after only a few million years of fusion.

Do all protostars become stars?

A protostar becomes a main sequence star when its core temperature exceeds 10 million K. This is the temperature needed for hydrogen fusion to operate efficiently. … The collapse of a very high mass protostar might take only a million years. Smaller stars can take more than a hundred million years to form.

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