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Representative lifetimes of stars as a function of their masses The change in size with time of a Sun-like star Artist's depiction of the life cycle of a Sun-like star, starting as a main-sequence star at lower left then expanding through the subgiant and giant phases, until its outer envelope is expelled to form a planetary nebula at upper right Chart of stellar evolution
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star life cycles red dwarf en: Image title: Stellar evolution of low-mass (left cycle) and high-mass (right cycle) stars, with examples in italics by CMG Lee.
In more massive stars, helium is produced in a cycle of reactions catalyzed by carbon called the carbon-nitrogen-oxygen cycle. [210] In evolved stars with cores at 100 million kelvin and masses between 0.5 and 10 M ☉, helium can be transformed into carbon in the triple-alpha process that uses the intermediate element beryllium: [210]
WR 104 is a triple star system located about 2,580 parsecs (8,400 ly) from Earth.The primary star is a Wolf–Rayet star (abbreviated as WR), which has a B0.5 main sequence star in close orbit and another more distant fainter companion.
The transition in primary energy production from one form to the other spans a range difference of less than a single solar mass. In the Sun, a one solar-mass star, only 1.5% of the energy is generated by the CNO cycle. [32] By contrast, stars with 1.8 M ☉ or above generate almost their entire energy output through the CNO cycle. [33]
The W51 nebula in Aquila - one of the largest star factories in the Milky Way (August 25, 2020). Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as "stellar nurseries" or "star-forming regions", collapse and form stars. [1]
Even heavier stars are born onto the main sequence, with no PMS evolution. [1] At the end of a low- or intermediate-mass star's life, the star follows an analogue of the Hayashi track, but in reverse—it increases in luminosity, expands, and stays at roughly the same temperature, eventually becoming a red giant.
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