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SUMMARY:Stellar metallicities in the extremely low mass galaxy Leo P
DTSTART;VALUE=DATE-TIME:20230322T092700Z
DTEND;VALUE=DATE-TIME:20230322T092900Z
DTSTAMP;VALUE=DATE-TIME:20241114T092431Z
UID:indico-contribution-236@meetings.aip.de
DESCRIPTION:Speakers: Heitor Ernandes (Lund Observatory)\nLeo P is a poorl
 y studied near-primordial isolated dwarf irregular galaxy at a distance of
  ∼ 1.6 Mpc\, with an extremely low mass of ∼ 105M⊙.\nFrom Hubble Spa
 ce Telescope and Arecibo Legacy Fast observations\, its characteristics sh
 ow the same behaviour as expected in a low-luminosity dSph Milky Way satel
 lite. It was defined as the “quintessential system to test theories of h
 ow the smallest structures in our universe survive and grow.”\nObservati
 ons suggest an ongoing star formation in its prominent H II region. This f
 eature also gives estimations of the oxygen abundance which is around 3% o
 f solar. It makes it one of the most metal-poor galaxies known in the loca
 l Universe.\nIn this work\, we present the first estimated spectroscopic m
 etallicities of evolved cool stars in Leo P. We use MUSE data to extract a
 nd analyse the spectra of 16 red giant branch stars. In order to derive th
 e metallicity of Leo P we apply literature calibrations for our equivalent
  widths measurements of the Ca II triplet lines.\nWe will also present ten
 tative luminosity- and stellar mass-metallicity relations compared to othe
 r low-metallicity galaxies (e.g. I Zw 18\, DDO 68\, and SBS 0335-052W) to 
 check the previously detected offset of these other galaxies\, with respec
 t to Leo P\, in these relations.\n\nhttps://iaus379.aip.de/event/20/contri
 butions/236/
LOCATION:Haus H\, Telegrafenberg
URL:https://iaus379.aip.de/event/20/contributions/236/
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