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Preprint Oct 2026

Slow Massive-Star Formation and the O-Star ZAMS Deficit

The scarcity of optically visible O stars near the theoretical zero-age main sequence (ZAMS) has puzzled astronomers for over four decades. We argue that it reflects prolonged accretion. If massive stars assemble over Myr timescales, as the inertial-inflow model predicts, core-hydrogen burning begins before accretion e...

P. Padoan, Samuel Shipkoff, M. Gieles et al. · 0 citations
Open access Oct 2026

Ballistic mixing: Stellar mergers drive internal mixing in extremely massive stars with implications for proto-globular cluster pollution

Extremely massive stars, with masses of 10^3--10^4 have been proposed as potential sources of the chemical enrichment associated with multiple populations in globular clusters. Early in the main sequence, these stars reach central temperatures of 65 to 75 MK, enabling nucleosynthesis through the CNO, NeNa, and MgAl cyc...

J. Román-Garza, C. Charbonnel, A. Rantala et al. · 0 citations

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