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SUMMARY:The Cosmic Hunt for Members in the Outskirts of Ultra Faint Dwarf 
 Galaxies: Ursa Major I\, Coma Berenices\, and Boötes I
DTSTART;VALUE=DATE-TIME:20230322T093100Z
DTEND;VALUE=DATE-TIME:20230322T093300Z
DTSTAMP;VALUE=DATE-TIME:20241114T092432Z
UID:indico-contribution-264@meetings.aip.de
DESCRIPTION:Speakers: Fletcher Waller (University of Victoria)\nThe chemic
 al abundance patterns exhibited by stars in Ultra-Faint Dwarf (UFD) galaxi
 es can provide a wealth of information about the evolutionary history of U
 FDs\, including what dynamical history the stars in a UFD may have experie
 nced. Of particular interest are stars in the outer regions of UFDs becaus
 e they may hold evidence of tidal stripping\, mergers\, or other mechanism
 s\; and because of the localized nature of enrichment events in UFDs\, it 
 is important to use every available star in analyses of UFD histories. I p
 resent detailed abundances from high-resolution spectroscopy with Gemini/G
 RACES for five new stars in three UFDs\, Coma Berenices (Com Ber)\, Ursa M
 ajor I (UMaI)\, and Boötes I (BooI)\, where four of our five stars are at
  distances greater than two half-light radii. The chemistries for all thre
 e galaxies are consistent with the outermost stars forming in the central 
 regions\, then moving to their current locations through dynamical mechani
 sms. In BooI\, the lower metallicity and lack of strong carbon enrichment 
 of its outermost stars could also be evidence of a dwarf galaxy merger. Th
 e abundance ratios and chemical patterns of the stars in Com Ber are consi
 stent with contributions from SN Ia (including an unusually high Ni value)
 \, which is unexpected for its star formation history and in conflict with
  previous suggestions that this system evolved chemically from a single co
 re collapse supernova event. We look forward to the new GHOST (Gemini High
 -resolution Optical SpecTrograph)\, which will make these types of chemica
 l abundance-quality observations possible for many more stars in UFDs.\n\n
 https://iaus379.aip.de/event/20/contributions/264/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/264/
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