Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session G02: Celebrating 100 years of Extragalactic CepheidsInvited Undergrad Friendly
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Sponsoring Units: DAP Chair: Belinda Wilkes, University of Bristol Room: MG Salon A - 3rd Floor |
Sunday, April 16, 2023 10:45AM - 11:21AM |
G02.00001: Edwin Hubble and Cepheids: Clinching the Case for Galaxies Invited Speaker: Robert Smith At the start of the twentieth century, very few astronomers believed external galaxies could be sighted even in the most powerful telescopes. But within two decades there had been a significant shift and a growing number of astronomers accepted a myriad of visible galaxies. It was, however, Edwin Hubble who clinched the case for galaxies in 1923 and 1924 through observations of Cepheid variables in the Andromeda Nebula. In this paper, I examine the growing body of evidence in the 1910s and 1920s in favor of galaxies and why Hubble’s observations were judged decisive. |
Sunday, April 16, 2023 11:21AM - 11:57AM |
G02.00002: Challenges in Cepheid Evolution and Pulsation Modeling Invited Speaker: Joyce A Guzik Cepheids have long been used as standard candles to determine distances around the Milky Way and to nearby galaxies. A discrepancy still remains for Hubble Constant determinations using Cepheids vs. the cosmic microwave background or calibrations to the tip of the red-giant branch. Therefore, refinement of Cepheid period-luminosity relations continues to be an active topic of research. |
Sunday, April 16, 2023 11:57AM - 12:33PM |
G02.00003: The odd journey of Edwin Hubble's famous plate, from Pasadena to Baltimore to space and back Invited Speaker: David Soderblom This is a story with a happy beginning, a long and dull middle, and a not-fully-satisfying ending. On October 6, 1923, Edwin Hubble took a 4x5 plate of a field in M31, the Andromeda Nebula, using the largest telescope in the world, the 100-inch Hooker reflector on Mount Wilson. This plate famously shows a “VAR!” annotation added to note his discovery of he first extragalactic Cepheid, critical to showing the universe extended beyond the Milky Way. In 1985, I had just begun at STScI, and I talked to Allan Sandage, who had worked closely with |
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