Postdocs

Dr Joachim Bestenlehner (Sheffield 2017–24)

Key publications:

• An excess of massive stars in the local 30 Doradus starburst, Schneider et al. (2018).

• The R136 star cluster dissected with HST/STIS II. Physical properties of the most massive stars, Bestenlehner, Crowther, Caballero-Nieves et al. (2020).

• Spectroscopic analysis of hot, massive stars in large spectroscopic surveys with de-idealised models, Bestenlehner et al. (2024)

• X Shooting ULLYSES: Massive Stars at Low Metallicity. XI. Pipeline-Determined Physical Properties of Magellanic Cloud OB stars Bestenlehner, Crowther, Hawcroft  et al. (2025a)

• Binarity at LOw Metallicity (BLOeM): Pipeline-Determined Physical Properties of OB Stars, Bestenlehner, Crowther, Bronner et al. (2025b)

Dr Saida Caballero-Nieves (Sheffield 2012–16)

Key publication: The R136 star cluster dissected with HST/STIS. I. Far-ultraviolet spectroscopic census and the origin of HeII 1640 in young star clusters, Crowther, Caballero-Nieves, Bostroem et al. (2016).

Dr Olivier Schnurr (Sheffield 2007–10)

Key publication: The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150 Msun stellar mass limit, Crowther, Schnurr, Hirschi et al. (2010).