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        A Tale of Three Cities : OmegaCAM discovers multiple sequences in the color-magnitude diagram of the Orion Nebula Cluster

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        Author
        Beccari, G.
        Petr-Gotzens, M.G.
        Boffin, H.M.J.
        Romaniello, M.
        Fedele, D.
        Carraro, G.
        Marchi, G. De
        de Wit, W.J.
        Drew, J. E.
        Kalari, V. M.
        Manara, Carlo Felice
        Martin, Eduardo L.
        Mieske, S.
        Panagia, N.
        Testi, L.
        Vink, Jorick S.
        Walsh, J. R.
        Wright, N. J.
        Attention
        2299/20394
        Abstract
        As part of the Accretion Discs in H$\alpha$ with OmegaCAM (ADHOC) survey, we imaged in r, i and H-alpha a region of 12x8 square degrees around the Orion Nebula Cluster. 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 for a revised look at the formation mode and early evolution of stars in clusters.
        Publication date
        2017-07-27
        Published in
        Astronomy & Astrophysics
        Published version
        https://doi.org/10.1051/0004-6361/201730432
        Other links
        http://hdl.handle.net/2299/20394
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