The O-star population of Carina shows a bimodal rotation speed distribution peaking at 60 km/s with few stars above 250 km/s, a ZAMS gap at 35 to 55 solar masses, a 1 Myr peak age, and evolutionary masses exceeding spectroscopic masses below 40 solar masses.
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Gaia-ESO Survey: massive stars in the Carina Nebula. II. The spectroscopic analysis of the O-star population
The O-star population of Carina shows a bimodal rotation speed distribution peaking at 60 km/s with few stars above 250 km/s, a ZAMS gap at 35 to 55 solar masses, a 1 Myr peak age, and evolutionary masses exceeding spectroscopic masses below 40 solar masses.