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main-sequence star

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main-sequence star: see Hertzsprung-Russell diagram Hertzsprung-Russell diagram [for Ejnar Hertzsprung and H. N. Russell], graph showing the luminosity of a star as a function of its surface temperature. The luminosity, or absolute magnitude, increases upwards on the vertical axis; the temperature (or some
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Either the star is so young that it hasn't finished contracting or so old--about 500 million years--that it has had time to expand its girth after becoming a main-sequence star.
For nearly a decade, Beta Pictoris has reigned as the only mature, main-sequence star with an encircling disk of dust - perhaps much like the disk from which our solar system evolved 4.
 
 
 
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