HII Region | COSMOSAlthough HII regions may produce thousands of stars in this manner, the star formation process itself is highly inefficient. Generally, less than 10% of the available gas is converted into stars, with the remainder of the gas dispersed by stellar winds, radiation pressure and possibly supernova explosions. Left behind, trailing the shock front, are open clusters such as the Pleiades, whose stars will slowly …
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Abstract This review discusses three main topics: evolution to the ultra-compact (UC) state; the properties of UC HII regions and their environments; and UC HII regions as probes of Galactic structure. The evolution to UC HII regions begins in giant molecular clouds that provide the natal material for prestellar cores that evolve into hot cores, the precursors of UC HII regions. The properties are hii regions and star formation filaTheory of Star Formation | Annual Review of Astronomy and are hii regions and star formation filaAbstractWe review current understanding of star formation, outlining an overall theoretical framework and the observations that motivate it.A conception of star formation has emerged in which turbulence plays a dual role, both creating overdensities to initiate gravitational contraction or collapse, and countering the effects of gravity in these overdense regions.Theoretical research about filament formation pro poses are hii regions and star formation filaTheoretical research about filament formation pro-poses three mechanism types.Regarding the first type, several studies discuss filament creation by self-gravitational fragmentation of a sheetlike cloud (Tomisaka & Ikeuchi 1983; Miyama et al. 1987a, b; Nagai et al. 1998; Kitsionas & Whitworth 2007; Balfour et al. 2015, 2017) created when molecular clouds are shock-compressed.
So far steady-state computation Justified only if dynamical timescale dyn >> recombination timescale rec rec ~ 100a for n=10 5 cm-3 massive star switch-on is faster initial size of HII region determined by total number of Lyman photonsIndia, China scientists probe massive stars triggering 2nd are hii regions and star formation filaNov 25, 2020 · The researchers found evidence for the interaction of the HII region with the left-over cloud material (from first-generation stars), triggering the formation of the next generation of stars are hii regions and star formation filaHigh Mass Star Formation - www.cfa.harvard.edu/The model implies that newly formed massive stars within dense molecular cores may initially form very small HII regions that at first evolve slowly through an increase in ionizing flux as would be caused by an increase in the mass or number of stars through continuing accretion through the HII region. Eric Keto, 2002, ApJ, 580, 980
Although HII regions may produce thousands of stars in this manner, the star formation process itself is highly inefficient. Generally, less than 10% of the available gas is converted into stars, with the remainder of the gas dispersed by stellar winds, radiation pressure and possibly supernova explosions. Left behind, trailing the shock front, are open clusters such as the Pleiades, whose stars will slowly H II region | astronomy | BritannicaAn H II region on the outer edge of a large molecular cloud can induce star formation. For instance, behind the bright Orion Nebula, deeper within the dark cold Giant Star-Forming RegionsGouliermis & Klessen Giant Star-Forming Regions Star Formation in Giant HII Regions (Observers view) Suggested Bibliography S. W. Stahler & F. Palla, The Formation of Stars, WILEY-VCH GmbH (2004) F. H. Shu, F. C. Adams & S. Lizaro, Star Formation in molecular clouds - Observation and theory, Annu. Rev. Astron. Astrophys.
Star formation in small clusters associated with bright-rimmed clouds and HII regions Bright-rimmed clouds (BRCs) found at the interface of the HII region and molecular clouds, are possible sites of triggered star formation due to radiative driven implosion (RDI). Based on the near infrared (NIR) observation of many BRCs, Sugitani et al. (1995) proposed that the star formation proceeds from are hii regions and star formation fila
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