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Low metallicity massive stars hold the key to interpret numerous processes inthe past Universe including re-ionization, starburst galaxies, high-redshiftsupernovae and GRBs. The Sagittarius Dwarf Irregular Galaxy (SagDIG,12+log(O/H)=7.37) represents an important landmark in the quest for analoguesaccessible with 10-m class telescopes. This paper presents low-resolutionspectroscopy executed with the Gran Telescopio Canarias that confirms thatSagDIG hosts massive stars. The observations unveiled three OBA-type stars andone red supergiant candidate. Pending confirmation from high-resolutionfollow-up studies, these could be the most metal-poor massive stars of theLocal Group.

Massive stars in the Sagittarius Dwarf Irregular Galaxy