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Spectroscopy: How it’s (really) made, and what’s hiding in the light! – Tim Campbell
September 26, 2020 @ 8:30 pm - 9:30 pm
Where do the elements come from? How do stars form? How do astronomers know what stars are made of? The answers to all these questions and more will be the topic for this presentation where we discuss spectroscopy — the gift that keeps on giving!
Tim Campbell has always been interested in space. He was inspired watching the Apollo missions as a young child, but was really hooked when he saw the rings of Saturn through a telescope. While you can still find Tim looking through telescopes, these days he wants to know how these things work — geeky science experiments are often added in for extra fun. Tim is a volunteer NASA/JPL Solar System Ambassador, a past president and active member of the Ford Amateur Astronomy Club in Michigan, and is also a planetarium operator and presenter at Henry Ford College. Tim does numerous outreach events and talks both under the night sky and indoors.
Read More:
Spectroscopy: https://astronomy.swin.edu.au/cosmos/s/Spectroscopy
What is Spectroscopy? http://loke.as.arizona.edu/~ckulesa/camp/spectroscopy_intro.html
A high-resolution version of the spectrum of our Sun, this image was created from a digital atlas observed with the Fourier Transform Spectrometer at the McMath-Pierce Solar Facility at the National Solar Observatory on Kitt Peak, near Tucson, Arizona. The images shown here were created to mimic an echelle spectrum, with wavelength increasing from left to right along each strip, and from bottom to top. Each of the 50 slices covers 60 angstroms, for a complete spectrum across the visual range from 4000 to 7000 angstroms. Source: N.A.Sharp, NOAO/NSO/Kitt Peak FTS/AURA/NSF
Periodic table showing the currently believed origins of each element. Elements from carbon up to sulfur may be made in stars of all masses by charged-particle fusion reactions. Iron group elements originate mostly from the nuclear-statistical equilibrium process in thermonuclear supernova explosions. Elements beyond iron are made in high-mass stars with slow neutron capture (s-process), and by rapid neutron capture in the r-process, with origins being debated among rare supernova variants and compact-star collisions. Note that this graphic is a first-order simplification of an active research field with many open questions.
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