2017A&A...604A..22B


Query : 2017A&A...604A..22B

2017A&A...604A..22B - Astronomy and Astrophysics, volume 604A, 22-22 (2017/8-1)

A tale of three cities. OmegaCAM discovers multiple sequences in the color-magnitude diagram of the Orion Nebula Cluster.

BECCARI G., PETR-GOTZENS M.G., BOFFIN H.M.J., ROMANIELLO M., FEDELE D., CARRARO G., DE MARCHI G., DE WIT W.-J., DREW J.E., KALARI V.M., MANARA C.F., MARTIN E.L., MIESKE S., PANAGIA N., TESTI L., VINK J.S., WALSH J.R. and WRIGHT N.J.

Abstract (from CDS):

As part of the accretion discs in Hα with OmegaCAM (ADHOC) survey, we imaged a region of 12x8 square degrees around the Orion Nebula Cluster in r, i and Hα. 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 4Myr 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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: pre-main sequence - open clusters and associations: individual: Orion - open clusters and associations: individual: Orion

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2207 1
2 NGC 1980 OpC 05 35 14 -05 55.4     2.5     ~ 102 0
3 NAME Ori A MoC 05 38 -07.1           ~ 2896 0

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2023.01.31-08:59:41

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