Massive stars in the Sagittarius Dwarf Irregular Galaxy

Abstract

Low metallicity massive stars hold the key to interpret numerous processes in the past Universe including re-ionization, starburst galaxies, high-redshift supernovae and GRBs. 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 paper 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.

Accepted for publication at MNRAS-Letters

References in corpus (8)

• Cosmic Star Formation History
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Cited by in corpus (6)

• First stellar spectroscopy in Leo P
• Stars and gas in the most metal-poor galaxies I: COS and MUSE observations of SBS 0335-052E
• A new reference catalogue for the very metal-poor Universe: +150 OB stars in Sextans A
• Spectroscopic evolution of massive stars near the main sequence at low metallicity
• Physical parameters of red supergiants in dwarf irregular galaxies in the Local Group
• Red supergiant stars in IC 1613 and metallicity-dependent mixing length in the evolutionary model