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How do we know how stars form

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Corina Castellanos

on 11 January 2013

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Transcript of How do we know how stars form

Corina Castellanos How Do We Know
How Stars Form? How Stars Form How Do We Know? Observations Theories Experiments Sources Sources - Huge cloud of gas -No phsycial observations of an actual star forming have been preformed -The Magnetorotational Instability (MRI) experiment was preformed at the Princeton Plasma Physics Laboratory (PPPL) -Theory of stellar genesis http://www.ph.surrey.ac.uk/astrophysics/files/how_stars_form.html http://www.ldolphin.org/stars.html - Gases begin to be compressed by Gravity into ball - Gravitational compression heats up gases - Heating of gases causes particles to move at faster rate - Particles are composed of hydrogen -Particles go so fast they finally bump into each other -Fusion occurs and helium is formed - -Gas ball heats so much it glows A star is formed! -Observations -Experiments -Theories - Infarred sources give evidence of collapsing protostars
*Protostar= parts broken away from cloud core; has own gravity http://www.musicanthology.org/?p=74 http://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/ http://www.astro.yale.edu/sf_frontiers/presentations/vandokkum.pdf http://www.jwst.nasa.gov/birth.html http://abyss.uoregon.edu/~js/ast122/lectures/lec13.html -We also look at young stars and see that they are surrounded by clouds of gas http://phys.org/news82916955.html *accretion disk in which stars form from are made of plasma, dust, other materials -Experiment simulates accretion disk with material in place of plasma, dust, and other materials. http://www.icr.org/article/7113/ -looking at light that hot gas clouds in outer space make that certain stars generally come from -Scientists use irradiated materials along with ions to test to show how dust in our galaxies work https://e-reports-ext.llnl.gov/pdf/315239.pdf *use electron microscophy and energy dispersive x-rays to test chemical changes in gases; much like stars would in our galaxy -Kepler telescope *stars are formed in vast clouds of interstellar gas and dust. -Hubble Telescope gives look into nurseries where stars form to see process http://www.ph.surrey.ac.uk/astrophysics/files/how_stars_form.html http://www.nasa.gov/mission_pages/kepler/main/index.html http://iopscience.iop.org/0034-4885/34/1/302 Scientists suggest that interstellar gas clouds might be rapidly changing *due to this interstellar conditions may change forming stars
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