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Astronomy and Astrophysics
Understand Bonnar-Ebert Model: Complement to Jeans Law?
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[QUOTE="Astronuc, post: 6587491, member: 15685"] What is one's primary text? Does one have secondary or supplemental references? For example, Peter H. Bodenheimer, Principles of Star Formation, Springer, 2011. Fragmentation is associated with turbulence in the cloud. It seems both models assume some form of hydrostatic equilibrium, and certainly large amounts of matter are rarely in static, or hydrostatic equilibrium. As such, a static model would not address turbulence, but only indicate a stability criterion. Perhaps this text will be helpful - [URL]http://www.ifa.hawaii.edu/users/jpw/classes/ism/reading/klessen_glover_saasfe.pdf[/URL] (search on fragmentation) Klessen and Glover write "some of these fluctuations may exceed the critical mass for gravitational collapse to set in. The presence of turbulence thus leads to the break-up into smaller units. The core fragments to build up a cluster of stars with a wide range of masses rather than forming one single high-mass star. We call this process gravoturbulent fragmentation, because turbulence generates the distribution of clumps in the first place, and then gravity selects a subset of them for subsequent star formation." [URL]https://en.wikipedia.org/wiki/Jeans_instability[/URL] [URL='https://en.wikipedia.org/wiki/Bonnor%E2%80%93Ebert_mass']https://en.wikipedia.org/wiki/Bonnor–Ebert_mass[/URL] [URL]https://www2.mpia-hd.mpg.de/homes/ppvi/posters/1B086.pdf[/URL] Some information on Jeans and Bonnor-Ebert models. Here is Jeans's original article - The stability of a spherical nebula [URL]https://royalsocietypublishing.org/doi/10.1098/rsta.1902.0012[/URL] "The [I]Bonnor[/I]-[I]Ebert[/I] sphere actually does not have uniform density but requires a density gradient to stay in equilibrium." [URL='https://books.google.com/books?id=3en405A82WgC&pg=PA116&lpg=PA116&dq=Bonnor-Ebert+model+compared+with+Jean+model&source=bl&ots=ZvdR1y2MpC&sig=ACfU3U3c-QfFh6o08h90Kk_wOxs6OpyOAQ&hl=en&sa=X&ved=2ahUKEwjfptrT4K71AhVukokEHclgBogQ6AF6BAgMEAM#v=onepage&q=Bonnor-Ebert%20model%20compared%20with%20Jean%20model&f=false']https://books.google.com/books?id=3en405A82WgC&pg=PA116&lpg=PA116&dq=Bonnor-Ebert+model+compared+with+Jean+model&source=bl&ots=ZvdR1y2MpC&sig=ACfU3U3c-QfFh6o08h90Kk_wOxs6OpyOAQ&hl=en&sa=X&ved=2ahUKEwjfptrT4K71AhVukokEHclgBogQ6AF6BAgMEAM#v=onepage&q=Bonnor-Ebert model compared with Jean model&f=false[/URL] Perhaps this might help - Cloud Equilibrium and Stability [URL]https://onlinelibrary.wiley.com/doi/10.1002/9783527618675.ch9[/URL] and Multiple Star Formation [URL]https://onlinelibrary.wiley.com/doi/10.1002/9783527618675.ch12[/URL] ALMA Observations of Massive Clouds in the Central Molecular Zone: Jeans Fragmentation and Cluster Formation [URL]https://iopscience.iop.org/article/10.3847/2041-8213/ab8b65[/URL] HIERARCHICAL GRAVITATIONAL FRAGMENTATION. I. COLLAPSING CORES WITHIN COLLAPSING CLOUDS [URL]https://iopscience.iop.org/article/10.1088/0004-637X/814/1/48[/URL]Edit/update: Something to ponder while studying star formation. 1,000-light-year wide bubble surrounding Earth is source of all nearby, young stars [URL]https://phys.org/news/2022-01-light-year-wide-earth-source-nearby.html[/URL] [/QUOTE]
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Understand Bonnar-Ebert Model: Complement to Jeans Law?
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