The formation of a protostar is accompanied by a structure that consists of an accretion disk, a bipolar outflow, and a surrounding envelope. The disk is at the stage of separation into protoplanetary rings. The disk plane is warped like the brim of a hat. The disk is 27 AU in diameter...
The flattened disk shape of the Galaxy suggests that it formed through a process similar to the one that leads to the formation of a protostar (see The Birth of Stars and the Discovery of Planets outside the Solar System). Building on this idea, astronomers first developed models that ...
9、y young, hot starsShocks Triggering Star Formation冲激波激发恒星形成Henize 206 (infrared)The Contraction of a Protostar原恒星收缩From Protostars to Stars原恒星到恒星(恒星的定义)Ignition of H He fusion processes核反应点火Star emerges from the enshrouding dust cocoon恒星穿出尘埃茧Evidence of Star...
Koldoba. Magneto-rotational instability in the accreting envelope of a protostar and the formation of the large-scale magnetic field. Astronomy Reports, ... KR Sychugov,VM Chechetkin,AY Lugovsky - 《Matem Mod》 被引量: 4发表: 2012年 Magnetorotational dynamo can generate large-scale vertical...
Around the protostar, a large flat discof dust, rock, and ice, which would become the planets, moons, and asteroids in the solar system, collected.This initial stage in the formation of the solar system lasted approximately 100,000 years. Next,the planets formed through the process known as...
Observations made using large ground-based and space-borne telescopes have probed cosmic history from the present day to a time when the Universe was less than one-tenth of its present age. Earlier still lies the remaining frontier, where the first stars, galaxies and massive black holes formed...
Planetary nebulas are the remnants of a dying star. Stellar nebulas are the birthplaces of new stars. How are stars formed or born? New stars are formed when gas from a stellar nebula collapses into a sphere. Once this sphere (referred to as a Protostar) can sustain nuclear fusion, the...
This rapid infall suggests that sufficient mass will collapse into the supermassive protostar before it reaches main-sequence. Extended Data Fig. 8 Thermal and turbulent support of collapsing clumps. a–d, Same as Extended Data Fig. 3, but for the clumps in the LWH (a) and the MMH (b–...
Circumstellar Disks in the Early Phases of Star Formation The current picture of the process of star formation requires the existence of circumstellar disks over a large fraction of the life of young stars, from the very early stages of the formation of a protostar to the time when the star...
When the protostar reaches a sufficient mass (about 80 times the mass of Jupiter), thermonuclear reactions begin. The whole system is carried away in a protoplanetary disk rotating more and more rapidly around its center. It is at this point that the aggregates of matter and gas begin to ...