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.
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
Unfortunately, it is impossible to tell accurately where a star is on the main sequence.
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.
A star on "main sequence" is a period in a stars evolution.A white dwarf is a stellar remainA supergiant star is the size of a very big star.So they are completely different and not even related.
A neutron star is a stellar remnant
It is when the star is close to its death stage. {Main Sequence, Giant, Super Giant, and then the white dwarfs}
There are more red dwarfs than any other type of star.
Do You Know That The Sun Is How Far From Main Sequence Or Called White Dwarfs .. The Sun Is Our Star And It's Size Is Medium-Sized The Far As 8,400 Solar Radii In Sun ,,
Main sequence stars include dwarf stars like red dwarfs, yellow dwarfs (like our Sun), and blue dwarfs. These stars are in a stable phase of hydrogen fusion in their cores, where the energy generated by nuclear reactions supports the star against gravitational collapse.
No, a white dwarf is not considered a main sequence star. A main sequence star is a star that is still fusing hydrogen in its core. A white dwarf is the remnant of a low to medium mass star in which fusion has stopped.
"Main sequence" stars are no longer new, and are just cookin' along for millions of years. "Main sequence" stars, depending on their weight and whether they orbit another nearby star can get old and become red dwarfs, white dwarfs, black dwarfs, neutron stars, novas, or super-novas.
Stars don't "lose" their "main sequence", because it's not something a star can "have" in the first place.Stars are more properly described as being "on" or "off" the "main sequence", and "sequence" isn't a good word for it anyway, because it implies that there is an actual sequence of events involved; in fact, the normal life sequence of a star has it going off the main "sequence".It may help if you stop thinking of them as "main sequence" stars and start thinking of them as either dwarfs or type III stars.
The curve that contains most stars is called the "Main sequence". The stars on that curve are known as "main sequence stars". Their main characteristic is that they get their energy from fusing hydrogen-1 into helium-4.
The sun is a main sequence star whereas Polaris is a super-giant.
A main sequence star is NOT a TYPE of star but a period in a stars evolution. Therefore all stars from the hottest to the coolest are on the main sequence at some stage - with the exception of brown dwarfs which do not reach the main sequence.
A star located off the main sequence indicates that the star is at a different stage in its life cycle. This could be due to factors such as age, mass, or chemical composition. Some common types of stars found off the main sequence include red giants, white dwarfs, and supergiants.