Kalamazoo Astronomical Society General Meeting Looking Up Since 1936 PUBLIC SERVICE ANNOUNCEMENT Location: Held Online via Zoom—see information below Date: Friday, April 9, 2021 @ 7:00 – 9:15 p.m. From: Joe Comiskey / email@example.com 269-532-6965 (Please do not publish) _________________________________________ Putting Together the Pieces of the Milky Way – Now with Pictures! Presented by Dr. Timothy Beers Recent advances from astronomical surveys have revealed spatial, chemical, and kinematical inhomogeneities in the inner region of the stellar halo of the Milky Way. In particular, large spectroscopic surveys, combined with Gaia astrometric data, have provided powerful tools for analyzing the detailed abundances and accurate kinematics for individual stars. Despite these efforts, however, spectroscopic samples are typically limited by the numbers of stars considered; their analysis and interpretation are also hampered by the complex selection functions that are often employed. Consequently, piecewise information on individual components (often from multiple surveys with differing selection functions) must be stitched together in order to reconstruct the multi-dimensional structure of the Milky Way’s stellar populations. Here we present a powerful alternative approach – a synoptic view of the spatial, chemical, and kinematical distributions of stars in the Milky Way based on large photometric survey databases, enabled by a well-calibrated technique for obtaining individual stellar metal abundances from broad-band photometry. We combine metallicities with accurate proper motions from the Gaia mission along the prime meridian of the Galaxy, and find that various stellar components are clearly separated from each other in the metallicity versus rotation velocity space. The substructures revealed from our unbiased, comprehensive maps demonstrate the clear advantages of this approach, which can be built upon by future mixed- and broad-band photometric surveys, and used as a blueprint for identifying the stars of greatest interest for upcoming spectroscopic studies. About the Speaker: Timothy Beers is the Grace-Rupley Professor of Physics at the University of Notre Dame, and a co-PI in the Physics Frontier Center JINA-CEE (Joint Institute for Nuclear Astrophysics – Center for the Evolution of the Elements). He is a former director of the US Kitt Peak National Observatory, and was a Professor in Physics & Astronomy at MSU for 25 years. Dr. Beers is interested in the origin and evolution of the elements in the Universe, and the assembly of large spiral galaxies such as the Milky Way, a field now referred to as Galactic Archaeology. For decades, Dr. Beers has designed and executed large-scale surveys of stars in the Milky Way to find objects that show the chemical history of the universe in their atmospheres. His work has led to the identification of a subset of the carbon-enhanced metal-poor stars that exhibit a characteristic elemental signature indicative of the very first stars. _________________________________________________________________________ To Register: Held Online via Zoom. Zoom meeting information is obtained as follows: Go to www.kasonline.org Click on the “Activities” Tab on the top left Click on “Schedule of Events” Scroll down to the event and click on “Click here to Register… For more information please visit our website: www.kasonline.org You can also follow the KAS on Twitter and/or Facebook. Admission is FREE!