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DTSTART;TZID=UTC:20220531T160000
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UID:1900-1654012800-1654016400@rpm.physics.lbl.gov
SUMMARY:HYBRID TALK | David Weinberg (Ohio State U./Visiting UCB Miller Professor) "Decoding the Origin of the Elements"
DESCRIPTION:Abstract: \n\nThe elemental abundance patterns of stars encode a wealth of information about the history of the Milky Way galaxy and the astrophysical processesthat create atomic nuclei.  I will describe some of what we have learned about the origin of elements in the Milky Way from the SDSS APOGEE survey\, which has measured detailed abundance patterns (typically 15-18 elements\nper star) for half a million stars.  The average chemical enrichment and the relative contributions from core collapse (massive star) supernovae and Type Ia (white dwarf) supernovae changes systematically with position in the Galaxy.  However\, the observed median trends of element abundance ratios are nearly independent of position\, and the abundance pattern of\na typical APOGEE star can be described with two free parameters and residuals at the few-percent level.  By isolating the enrichment pattern of core collapse supernovae we can test theoretical models of massive star evolution and black hole formation.  Other elements such as nitrogen and cerium provide clues to the mixing of nuclear-processed material within intermediate mass stars.  The most important degeneracy in Galactic chemical evolution models is the tradeoff between the overall yield of heavy elements (sensitive to black hole formation) and the ejection of elements in galactic winds. Measurement of deuterium and helium-3 can help break this degeneracy because these isotopes originate primarily or entirely in the big bang.\n\n\n──────────\nTroy Cortez is inviting you to a scheduled Zoom meeting. \nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/94367647939?pwd=UEJQRjhlaGc4dFFqT1c1WEtRSnVRZz09 \nMeeting ID: 943 6764 7939\nPasscode: 531399\nOne tap mobile\n+16699006833\,\,94367647939#\,\,\,\,*531399# US (San Jose)\n+12133388477\,\,94367647939#\,\,\,\,*531399# US (Los Angeles) \nDial by your location\n+1 669 900 6833 US (San Jose)\n+1 213 338 8477 US (Los Angeles)\n+1 669 219 2599 US (San Jose)\n+1 971 247 1195 US (Portland)\n+1 206 337 9723 US (Seattle)\n+1 253 215 8782 US (Tacoma)\n+1 346 248 7799 US (Houston)\n+1 602 753 0140 US (Phoenix)\n+1 720 928 9299 US (Denver)\n+1 646 518 9805 US (New York)\n+1 646 558 8656 US (New York)\n+1 651 372 8299 US (Minnesota)\n+1 786 635 1003 US (Miami)\n+1 267 831 0333 US (Philadelphia)\n+1 301 715 8592 US (Washington DC)\n+1 312 626 6799 US (Chicago)\n+1 470 250 9358 US (Atlanta)\n+1 470 381 2552 US (Atlanta)\nMeeting ID: 943 6764 7939\nPasscode: 531399\nFind your local number: https://lbnl.zoom.us/u/adUylfsSvF \nJoin by SIP\n94367647939@zoomcrc.com \nJoin by H.323\n162.255.37.11 (US West)\n162.255.36.11 (US East)\n115.114.131.7 (India Mumbai)\n115.114.115.7 (India Hyderabad)\n213.19.144.110 (Amsterdam Netherlands)\n213.244.140.110 (Germany)\n103.122.166.55 (Australia Sydney)\n103.122.167.55 (Australia Melbourne)\n64.211.144.160 (Brazil)\n69.174.57.160 (Canada Toronto)\n65.39.152.160 (Canada Vancouver)\n207.226.132.110 (Japan Tokyo)\n149.137.24.110 (Japan Osaka)\nMeeting ID: 943 6764 7939\nPasscode: 531399 \n──────────
URL:https://rpm.physics.lbl.gov/event/hybrid-talk-david-weinberg-ohio-state-u-visiting-ucb-miller-professor-decoding-the-origin-of-the-elements/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
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