ERS120H5 Lecture Notes - Fault (Geology), San Andreas Fault, Young Stellar Object
Document Summary
Lecture 2- solar system and earth formation/ jan 9 2013. Molecular clouds (star clouds) mainly hydrogen, helium, cold ices and dust, and lithium. First is h2 region (very hot region of ionized gas which come out and push on gas and dust around the h2 region, that eventually make dense cores. Stage 2 turbulence causes the cloud to mix itself. Stage 3 the ionization front of the h2 region passes through the dense core, which collapses the cloud. Stage 4 the core keeps getting blasted by uv radiation and photo evaporation dissipates and shapes the cloud and star forms in center because of gravitational collapse. Last stage, the protoplanterary disk (ppd) and young stellar object (yso). Star heats the disk from the inside, and also heat is generated by the gas that is falling inwards thru the disk. Mineral condensation sequence: different mineral species will condense in a ppd as a function of t and distance from the central star.
