The main sequence on the Hertzsprung-Russell Diagram is believed to map the aging process of the most common type of star.
The HR diagram does not reference stars on their way to the main sequence, only during or after.
main sequence
above the main-sequence stars
The main sequence - the region across the middle of the diagram.
On the main sequence.
The HR diagram does not reference stars on their way to the main sequence, only during or after.
Main sequence stars.
main sequence
Of course they are on the HR diagram. They are simply not on the main sequence.
Main sequence
In the HR-diagram, a diagram of color vs. luminosity, most stars are concentrated close to one curve, called the "main sequence". It turns out that stars on the main sequence are the stars that mainly get their energy by converting hydrogen into helium.
The most massive main sequence stars are the brightest, (O main sequence star on Hertzsprung-Russel Diagram). Main sequence stars obey a mass-luminosity relation. On the H-R diagram the vertical axis is the brightness. So the stars along the top are the brightest (intrinsically).
It's the main sequence because on the H-R diagram most of the stars fall on or near this line.
above the main-sequence stars
Main sequence stars are located on the H-R diagram based on their luminosity or absolute magnitude verses their spectral class and effective temperature.
The main sequence - the region across the middle of the diagram.
On the main sequence.