Massive stars in the Sagittarius Dwarf Irregular Galaxy

García, Mriam. 2018. Massive stars in the Sagittarius Dwarf Irregular Galaxy. Monthly Notices of the Royal Astronomical Society 474, 1, DOI: 10.1093/mnrasl/slx194

Low metallicity massive stars hold the key to interpret numerous processes in the past Universe including re-ionization, starburst galaxies, high-redshift supernovae, and gamma-ray bursts. The Sagittarius Dwarf Irregular Galaxy [SagDIG, 12+log(O/H) = 7.37] represents an important landmark in the quest for analogues accessible with 10-m class telescopes. This Letter presents low-resolution spectroscopy executed with the Gran Telescopio Canarias that confirms that SagDIG hosts massive stars. The observations unveiled three OBA-type stars and one red supergiant candidate. Pending confirmation from high-resolution follow-up studies, these could be the most metal-poor massive stars of the Local Group.

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