Nicholas Wright n.j.wright@keele.ac.uk
A tale of three cities - OmegaCAM discovers multiple sequences in the color-magnitude diagram of the Orion Nebula Cluster
Wright, Nicholas J.
Authors
Abstract
As part of the accretion discs in Ha with OmegaCAM (ADHOC) survey, we imaged a region of 12 × 8 square degrees around the Orion Nebula Cluster in r, i and Ha. 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.
Acceptance Date | May 26, 2017 |
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Publication Date | Jul 27, 2017 |
Publicly Available Date | Mar 28, 2024 |
Journal | Astronomy and Astrophysics |
Print ISSN | 2329-1273 |
Publisher | Hans Publishers |
Pages | A22 - A22 |
DOI | https://doi.org/10.1051/0004-6361/201730432 |
Keywords | stars: pre-main sequence, open clusters and associations: individual: Orion |
Publisher URL | https://doi.org/10.1051/0004-6361/201730432 |
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