Hadar (Beta Centauri) is actually three stars. They are very close together and hence appear as one.
Hadar, also known as Beta Centauri, is a binary star system located approximately 390 light-years away from Earth. It consists of two stars: a blue-white giant star and a main sequence star. The brighter star is a binary itself, making Hadar a complex multiple star system.
Sirius is not a single star but a binary star system consisting of a white main sequence star and a white dwarf.
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.
Chort, also known as Omicron1 Tauri, is a binary star system located in the constellation Taurus. The primary star is a yellow-white F-type main-sequence star, while the companion star is a smaller K-type main-sequence star.
Main sequence stars are bigger.
Hadar, also known as Beta Centauri, is a binary star system located approximately 390 light-years away from Earth. It consists of two stars: a blue-white giant star and a main sequence star. The brighter star is a binary itself, making Hadar a complex multiple star system.
No. Red giants are not 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.
The sun is a main sequence star, so 1 AU.
Main-Sequence star
Sirius is not a single star but a binary star system consisting of a white main sequence star and a white dwarf.
None of those is a main sequence star.
The defining characteristic of a main sequence star burns hydrogen to helium in its core.
Most stars are on the main sequence; that includes red dwarves. Specifically, in this case, the closest known star - Proxima Centauri - is also the closest main-sequence star.
Algol is a blue main-sequence star in the constellation Perseus
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.
Any star that it fusing hydrogen into helium is classed as a main sequence star.