Αποτελέσματα Αναζήτησης
1 Αυγ 2012 · Massive stars comprise less than 1% of the stellar content of a new-born population in galaxies, as a result of the (Salpeter) slope of the initial mass function (IMF), and are spectroscopically either early B stars (8–20 M ☉) or O stars (≥20 M ☉).
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]
30 Μαΐ 1997 · O'Dell and Beckwith (p. 1355) describe the dynamics of stellar birth, focusing on star-forming regions in the Orion Nebula, which show that young stars do not just collapse into spheres of gas but produce jets, winds, and possible planet-forming disks of dust.
In the direction of the constellation of Sagittarius, some 5,500 light-years away in the southern Milky Way, is a chaotic caldron of stellar birth known as GGD 27. While such stellar nurseries are sprinkled liberally throughout our Milky Way Galaxy, GGD 27 presents an especially compelling snapshot of stellar birth.
6 Δεκ 2016 · Introduction. Pre-main-sequence stars of low mass sometimes exhibit dramatic, if transient, episodes of greatly enhanced luminosity. The most well-known example is that of FUors. Here, the luminosity increases in about a year, while the subsequent decline stretches over many decades.
How do stars form? Stars form when a particular type of interstellar cloud, called a molecular cloud, starts collapsing by the effect of its own gravity and breaks up into tens or hundreds of smaller clumps. Owing to the gravitational attraction, each cloud fragment attracts more and more matter from its surroundings (see Figure 1).
2 Ιαν 2018 · The Hubble Space Telescope has imaged many such spectacular regions of stellar birth. Newly ignited clusters of stars are surrounded by their natal gas clouds, which are lit up into colorful nebulae by the light of the young massive newborn stars within.
