.... until all the hydrogen is depleted.
Unfortunately, it is impossible to tell accurately where a star is on the main sequence.
A red main sequence star would be a red dwarf or a branch red giant. To be on the main sequence, you have to have hydrogen nuclear fusion.
Algol is a blue main-sequence star in the constellation Perseus
Polaris - the current North star is a multiple star system., consisting of the main star and smaller companions. The main star Alpha Ursae Minoris is a bright star, a 6 solar mass supergiant and it is a main sequence star. Orbiting very close to this main star is a white dwarf of roughly 1.5 solar masses. This is not a main sequence star. Orbiting further out is the third companion, a 1.39 solar mass star. This is a main sequence star. There are also two more distant components (α UMi C and α UMi D) - Polaris is thought to be part of an open cluster - I do not know if these later two stars are main sequence or not.
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Yes, Proxima Centauri is a main-sequence star and will remain so for about another four trillion years.
allstars
No. All stars are hot. For stars on the main sequence, the largest it is, the hotter it is. When a star leaves the main sequence to become a giant or supergiant it will cool down, but will remain hot enough to glow brightly.
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Main Sequence
Our sun is a main sequence (dwarf) star. It's expected to remain so for the next 5 billion years or so. After that it will expand briefly into a red giant, then collapse into a white dwarf.
its to the right of the middle of the main sequence.
There are billions of stars that are not on the main sequence.
The sun is a main sequence star
No. They have the lowest temperatures on the main sequence. The hottest main sequence stars are blue.