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Astronomy Basics An Introduction to Astronomy 2002 Electromagnetic spectrum The Radiation Out There Radio image of Jupiter Radio: planets, hydrogen Micro: cosmic background Infrared: planets, new stars Visible: fusion UV: hot stars X-ray & gamma: bigger than stars, older than the Sun X-rays from the accretion disk of a black hole The Tools of the Trade Aricebo Galileo’s Scope Compton Gamma Ray Observatory Chandra The Radiation Down Here Best Bets: Radio, Visible Worst View: UV, Micro, Gamma Most Interference: Radio, Visible, IR Who, Where and How? What is a spectrum? Spectrum Continuous Emission Absorption Composition, abundance, mass, rotation, interstellar dust Spectroscopy - an example X-ray spectrum Element composition Cassiopeia A - SNR Radio versus X-ray spectrums HR diagrams Based on temperature and luminosity Gives us an idea of the mass Mass determines life-cycle events Life-cycle events Aging – red giant/planetary nebula – supergiant/supernova Death – white dwarf – neutron star – black hole Astronomy at Home Start Cheap! Get familiar with the Sky SETI: www.seti.org – (SETI@home) Credits General information: – Kaufmann, W. & Comins, N. Discovering the Universe, 4th ed., W.H. Freeman & Co., NY, 1997. – Imagine the Universe! A service of the High Energy Astrophysics Science Archive Research Center (HEASARC) a part of the Laboratory for High Energy Astrophysics (LHEA) at NASA/GSFC. http://imagine.gsfc.nasa.gov/docs/homepage.html Pictures/Images – – – – Slide 6: Gallery picture from Keck Observatory Slide 2: Educational graphic from Imagine the Universe! Slide 3: Harvard's Field Guide to X-ray Astronomy. Slide 7: Educational graphic from Imagine the Universe! Credits -continued Slides 7-13: Images come from the Astronomy Picture of the Day archive. Please see the archived picture for further photographic credit. Slide 14: Images from Imagine the Universe!, and Molecular Probes. Slide 17: Educational graphics from Imagine the Universe! Slides 21-22: – – HR diagrams on slides 21-22 come from xxx The evolution diagrams come from xxx Slide 23: The aging/death chart is adapted from a similar chart in Discovering the Universe by Kaufmann and Comins Slide 24: Image is a Hubble Space Telescope gallery picture from STScI.