Bibcode
Schneider, F. R. N.; Ramírez-Agudelo, O. H.; Tramper, F.; Bestenlehner, J. M.; Castro, N.; Sana, H.; Evans, C. J.; Sabín-Sanjulián, C.; Simón-Díaz, S.; Langer, N.; Fossati, L.; Gräfener, G.; Crowther, P. A.; de Mink, S. E.; de Koter, A.; Gieles, M.; Herrero, A.; Izzard, R. G.; Kalari, V.; Klessen, R. S.; Lennon, D. J.; Mahy, L.; Maíz Apellániz, J.; Markova, N.; van Loon, J. Th.; Vink, J. S.; Walborn, N. R.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 618, id.A73
Fecha de publicación:
10
2018
Revista
Número de citas
74
Número de citas referidas
67
Descripción
The 30 Doradus (30 Dor) nebula in the Large Magellanic Cloud (LMC) is
the brightest HII region in the Local Group and a prototype starburst
similar to those found in high redshift galaxies. It is thus a stepping
stone to understand the complex formation processes of stars in
starburst regions across the Universe. Here, we have studied the
formation history of massive stars in 30 Dor using masses and ages
derived for 452 mainly OB stars from the spectroscopic VLT-FLAMES
Tarantula Survey (VFTS). We find that stars of all ages and masses are
scattered throughout 30 Dor. This is remarkable because it implies that
massive stars either moved large distances or formed independently over
the whole field of view in relative isolation. We find that both
channels contribute to the 30 Dor massive star population. Massive star
formation rapidly accelerated about 8 Myr ago, first forming stars in
the field before giving birth to the stellar populations in NGC 2060 and
NGC 2070. The R136 star cluster in NGC 2070 formed last and, since then,
about 1 Myr ago, star formation seems to be diminished with some
continuing in the surroundings of R136. Massive stars within a projected
distance of 8 pc of R136 are not coeval but show an age range of up to 6
Myr. Our mass distributions are well populated up to 200
M⊙. The inferred IMF is shallower than a Salpeter-like
IMF and appears to be the same across 30 Dor. By comparing our sample of
stars to stellar models in the Hertzsprung-Russell diagram, we find
evidence for missing physics in the models above log L/L⊙
= 6 that is likely connected to enhanced wind mass loss for stars
approaching the Eddington limit. Our work highlights the key information
about the formation, evolution and final fates of massive stars
encapsulated in the stellar content of 30 Dor, and sets a new benchmark
for theories of massive star formation in giant molecular clouds.
Based on observations collected at the European Southern Observatory
under programme ID 182.D-0222.
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