Barnard 68 - A molecular cloud.docx

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University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

2/28/2013 1:36:00 PM B68: Made of dust and gas  As it shrinks, it concentrates its energy, it heats up.  Spins faster and faster, flattening out into a disk shape, called protostar( process of becoming a star)  They activate bipolar jets, funneled towards mag. Poles of the star.  Black ovals are dust, fuzzy background is the orion nebula itself.  Face on- jet coming towards you, so cannot be seen.  Edge on- tilted 90 degrees, u can see jets coming out. o Start off with something big and cold. o Enters the HR diagram as a red large obect., bighter since it has more surface area. o Fusion ignite in the core, zams – initial phase in the stars lifetime o Its easy to produce small stars. o When protostar heads towards main sequence, it gets dimmer o Blue stars in the main sequence are much brighter, so red stars cannot be seen as much. o Gas has been pushed away by the light of the stars.  2/28/2013 1:36:00 PM Pressure g
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