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- W2923119834 abstract "Like planets, stars are born, but they do so in considerably more spectacular fashion and at rates highly dependent on their environment. A protostar, sometimes called an embryonic star, is a molecular cloud (S 25) undergoing gravitational contraction and accretion of gas and dust prior to initiating fusion reactions. The end of accretion and the onset of a stellar wind (S 29) is often considered the dividing line between a collapsing protostar and the next stage in stellar evolution, the so-called pre-main sequence stars (S 2 and S 3) such as T Tauri or higher mass Herbig Ae/Be objects, discussed in the next two entries. But the transition is not sharp: some pre-main sequence stars are still accreting matter. Other classes of objects associated with newborn stars are jets (S 20) and Herbig-Haro objects (S 21). Protostars are also called “young stellar objects” (YSOs), but that term sometimes also encompasses pre-main sequence stars. Surprisingly, our Galaxy births only about one star per year, but “starburst” galaxies such as M82 may form stars at a thousand times that rate." @default.
- W2923119834 created "2019-04-01" @default.
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- W2923119834 date "2019-01-01" @default.
- W2923119834 modified "2023-09-23" @default.
- W2923119834 title "The Protostellar Family" @default.
- W2923119834 doi "https://doi.org/10.1007/978-3-030-10380-4_7" @default.
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