A tale of three cities OmegaCAM discovers multiple sequences in the color magnitude diagram of the Orion Nebula Cluster
Author
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Beccari, G.
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Petr Gotzens, M. G.
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Boffin, H. M. J.
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Romaniello, M.
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Fedele, D.
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Carraro, Giovanni
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De Marchi, G.
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de Wit, W. J.
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Drew, J. E.
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Kalari, V. M.
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Manara, C. F.
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Martin, E. L.
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Mieske, S.
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Panagia, N.
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Testi, L.
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Vink, J. S.
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Walsh, J. R.
Author
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Wright, N. J.
Admission date
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2018-07-10T22:47:35Z
Available date
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2018-07-10T22:47:35Z
Publication date
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2017
Cita de ítem
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Astronomy & Astrophysics, 604, A22 (2017)
es_ES
Identifier
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10.1051/0004-6361/201730432
Identifier
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https://repositorio.uchile.cl/handle/2250/149736
Abstract
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As part of the accretion discs in H alpha with OmegaCAM (ADHOC) survey, we imaged a region of 12x8 square degrees around the Orion Nebula Cluster in r, i and H alpha. Thanks to the high-quality photometry obtained, we discovered three well-separated pre-main sequences in the color-magnitude diagram. The populations are all concentrated towards the cluster's center. Although several explanations can be invoked to explain these sequences, we are left with two competitive but intriguing scenarios: a population of unresolved binaries with an exotic mass ratio distribution, or three populations with different ages. Independent high-resolution spectroscopy supports the presence of discrete episodes of star formation, each separated by about a million years. The stars from the two putative youngest populations rotate faster than the older ones, in agreement with the evolution of stellar rotation observed in pre-main sequence stars younger than 4 Myr in several star forming regions. Whatever the final explanation, our results prompt a revised look at the formation mode and early evolution of stars in clusters.
es_ES
Patrocinador
dc.description.sponsorship
UK's Science and Technology Facilities Council
Swiss National Science Foundation
Belgian Fund for Scientific Research (Fond National de la Recherche Scientifique, FNRS)
FRFC 2.5.594.09.F
Gruber Foundation Fellowship