That region on a two-dimensional graph of luminosity versus temperature for stars (the Herzsprung-Russel diagram), which runs from high temperature and high luminosity to low temperature and low luminosity, in which most of the stars (plotted as points on the diagram) are found. A normal star such as the earth's sun will spend most of its time over billions of years within this region of temperature and luminosity, as it progressively converts more of its original hydrogen into heavier elements. After the hydrogen is consumed, a star may become a red giant or evolve into other types of star not within the main sequence region.
The region on the Hertzsprung-Russell diagram occupied by stars burning hydrogen into helium in their cores.
the majority of stars, arranged according to mass, luminosity, and surface temperature.
A classification of a stars that all shine via hydrogen thermonuclear fusion, and are all in a state of hydrodynamic equilibrium. Stars spend the greatest portion of their luminous (nuclear fusion) life on the main sequence.
principal sequence of stars on the graph of luminosity versus effective temperature (H-R diagram), encompassing more than 90% of observable stars. These stars are converting hydrogen to helium by nuclear reactions in their cores The lower mass limit for the Main Sequence is 0.085 Mo and the upper limit is about 60 Mo.
Major distributional segment of the stars running diagonally across the H-R diagram from the upper left to the lower right.
Well-defined band on the Hertzsprung—Russell diagram, on which most stars are found, running from the top left of the diagram to the bottom right.
A region in the Hertzsprung-Russell Diagram, running from the upper left (blue giants) to the lower right (red dwarfs) diagonally across the middle of the Diagram. The vast majority of stars are Main Sequence stars, and therefore, most stars in any given group of stars will have their properties plot somewhere on the Main Sequence.
the section of the HR Diagram that runs from the upper-left hand corner to the lower-right hand corner and characterizes stars in the main stage of their life; the stage at which they fuse hydrogen and helium in their core
An area on the Hertzsprung-Russel Diagram containing "middle aged" stars like the Sun. more
The population of mature stars whose cores are undergoing hydrogen fusion, which stabilizes them against gravitational collapse.
main band of stars on HR diagram, running from top left to bottom right: stars burning hydrogen to helium in their core
A well-defined band on an H-R diagram on which most stars tend to be found, running from the top left of the diagram to the bottom right.
The stage in a star's life during which it is shining normally by nuclear reactions in its centre. During this time, stars lie on a diagonal line on the Hertzsprung-Russell diagram.
the band of stars on a Hertzsprung-Russell diagram stretching from the upper left to the lower right; stars spend most of their lives in the main sequence phase, in which they are fusing hydrogen into helium in their cores
a diagonal region in the Hertzsprung-Russel diagram that indicates 90 percent of all stars.
A sequence of stars on the Hertzsprung-Russell diagram, containing the majority of stars, that runs diagonally from the upper left to the lower right.
The stage in which a star has matured from being a protostar. In small stars this stage can last for billions of years, but only millions in massive stars.
The stable phase of a star's lifetime, when outward pressure from internal fusion process using hydrogen for fuel is balanced by the inward force of self-gravitation. This phase is usually the longest phase of a star's lifetime. Our Sun is a main sequence star.
the narrow diagonal band in the Hertzsprung-Russell diagram going from upper left to lower right describing the characteristics of 90% of the stars. Stars spend about 90% of their lives in this stage and are fusing hydrogen to create helium.
A narrow region on an HR diagram in which most stars are plotted.
The main sequence of stars on the Hertzsprung-Russell diagram, containing about 90% of all known stars. A star spends most of its life on the main sequence. The position of the star on the main sequence and the time it spends there depends mainly on the mass of the star. More massive stars are found higher on the main sequence, they also have shorter lifetimes.
The region of the H-R diagram running from upper left to lower right, which includes roughly 90 percent of all stars.
The main sequence of the Hertzsprung-Russell diagram is the curve along which the majority of stars are located. Stars on this band are known as main-sequence stars or dwarf stars.