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The reason main sequence has a limit at the lower end is because of temperature and pressure. The lower limit exists in order to exclude stellar objects that are not able to sustain hydrogen fusion.

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Q: Why does main sequence has a limit at the lower end?
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The main sequence has a limit at the lower end because?

the main sequence has a limit at the lower end because as a star's mass decreases, its core temperature and pressure decrease too. This eventually causes the nuclear fusion reactions in the core to stop, leading the star to move off the main sequence.


How are stars on the upper left end of the main sequence different from those on the lower right end?

The main sequence is a map of star brightness against their temperature. Stars that lie on the main sequence in the top left are the high mass stars. Cooler, smaller stars lie near the line at the lower right.


What type of star would be shown at the lower right end of the main sequence on the H R diagram?

Depending on how "low" on the chart it will either be a red dwarf or a PMS (Pre-main sequence) star.


In which class either lower limit or upper limit is missing?

open end class


What phase do stars end their main sequence as?

red supergiant


What is the Birth Line in the Hertzsprung-Russell Diagram?

The birth line in the Hertzsprung-Russell Diagram represents the path that stars follow as they evolve from protostars to the main sequence. It shows how a star changes in luminosity and temperature as it progresses towards becoming a main sequence star. Stars begin their life on the birth line before settling into the main sequence phase.


What does it mean when a star goes off the main sequence?

When a star "goes off the main-sequence" it generally means the star has run out of hydrogen fuel and is beginning the post-main-sequence or its end of life phase. The main sequence of a star is the time where it is no longer just a proto-star but is burning hydrogen as a primary source of fuel.


When does the main sequence star phase of a star end?

The "main sequence" is the region (on the HR diagram) for stars which burn hydrogen-1. Once stars use up most of their hydrogen-1 (and have significant amounts of helium-4), they leave the main sequence.


What is the difference between an infinite sequence and a finite sequence?

A finite sequence has a beginning and an end, whereas an infinite sequence has no end.


Stars leave the main sequence when they?

Stars leave the main sequence when they have exhausted their core hydrogen fuel, causing them to expand into red giants or supergiants. This transition marks the end of stable nuclear fusion in their cores and the beginning of the next phase in their lifecycle.


A type M star is likely to appear?

reddish in color due to its low temperature and emit less light compared to other stars. It falls within the lower end of the main sequence of stars.


How do red dwarfs differ from a main sequence star?

It's the size. A dwarf star has reached the end of the road and has collapsed. It's a little old star and people don't notice it, mostly.