The GALAH survey: Chemical homogeneity of the Orion complex

Abstract

Due to its proximity, the Orion star forming region is often used as a proxy to study processes related to star formation and to observe young stars in the environment they were born in. With the release of Gaia DR2, the distance measurements to the Orion complex are now good enough that the three dimensional structure of the complex can be explored. Here we test the hypothesis that, due to non-trivial structure and dynamics, and age spread in the Orion complex, the chemical enrichment of youngest stars by early core-collapse supernovae can be observed. We obtained spectra of 794 stars of the Orion complex with the HERMES spectrograph at the Anglo Australian telescope as a part of the GALAH and GALAH-related surveys. We use the spectra of $\sim 300$ stars to derive precise atmospheric parameters and chemical abundances of 25 elements for 15 stellar clusters in the Orion complex. We demonstrate that the Orion complex is chemically homogeneous and that there was no self-pollution of young clusters by core-collapse supernovae from older clusters; with a precision of 0.02 dex in relative alpha-elements abundance and 0.06 dex in oxygen abundance we would have been able to detect pollution from a single supernova, given a fortunate location of the SN and favourable conditions for ISM mixing. We estimate that the supernova rate in the Orion complex was very low, possibly producing no supernova by the time the youngest stars of the observed population formed (from around 21 to 8 Myr ago).

arXiv commentAccepted to MNRAS

References in corpus (66)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• emcee: The MCMC Hammer
• The chemical composition of the Sun
• Gaia Data Release 2. Summary of the contents and survey properties
• On the variation of the Initial Mass Function
• The Gaia mission
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• A Universal Stellar Initial Mass Function? A Critical Look at Variations
• Nucleosynthesis Yields of Core-Collapse Supernovae and Hypernovae, and Galactic Chemical Evolution
• Improving PARSEC models for very low mass stars
• The GALAH+ Survey: Third Data Release
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
• Spectroscopy Made Easy: Evolution
• The Luminosity & Mass Function of the Trapezium Cluster: From B stars to the Deuterium Burning Limit
• The GALAH Survey: Second Data Release
• Modern stellar spectroscopy caveats
• The APOGEE-2 Survey of the Orion Star Forming Complex II: Six-dimensional structure
• Gaia FGK Benchmark Stars - Metallicity
• Atomic data for the Gaia-ESO Survey
• A reanalysis of the Gaia Data Release 2 photometric sensitivity curves using HST/STIS spectrophotometry
• The chemical homogeneity of open clusters
• Chemical Homogeneity in the Hyades
• Non-LTE oxygen line formation in 3D hydrodynamic model stellar atmospheres
• A highly abnormal massive star mass function in the Orion Nebula cluster and the dynamical decay of trapezia systems
• Spectroscopy of Very Low Mass Stars and Brown Dwarfs in the Lambda Orionis Star Forming Region. I. Enlarging the census down to the planetary mass domain in Collinder 69
• Properties of hierarchically forming star clusters
• The chemical composition of the Orion star forming region: I. Homogeneity of O and Si abundances in B-type stars
• Orion Revisited - I. The massive cluster in front of the Orion Nebula Cluster
• Identical or fraternal twins? : The chemical homogeneity of wide binaries from Gaia DR2
• Structure, kinematics, and ages of the young stellar populations in the Orion region
• The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters
• FLAMES spectroscopy of low-mass stars in the young clusters sigma Ori and lambda Ori
• Early turbulent mixing as the origin of chemical homogeneity in open star clusters
• The GALAH survey: The data reduction pipeline
• On the temporal evolution of the stellar mass function in Galactic clusters
• The Structure, Dynamics and Star Formation Rate of the Orion Nebula Cluster
• The Distances to Open Clusters from Main-Sequence Fitting. I. New Models and a Comparison to the Properties of the Hyades Eclipsing Binary vB 22
• Triggered Star Formation by Massive Stars
• A survey for low mass spectroscopic binary stars in the young clusters around sigma Orionis and lambda Orionis
• How magnetic activity alters what we learn from stellar spectra
• Prospects for chemically tagging stars in the Galaxy
• 3D dynamics of the Orion cloud complex -- Discovery of coherent radial gas motions at the 100-pc scale
• Nested shells reveal the rejuvenation of the Orion-Eridanus superbubble
• Oxygen from the Lambda 7774 High-Excitation Triplet in Open Cluster Dwarfs: Hyades
• The effect of stellar activity on the spectroscopic stellar parameters of the young solar twin HIP 36515
• Gamma-ray Emission of 60Fe and 26Al Radioactivities in our Galaxy
• NGC 1980 is not a foreground population of Orion: Spectroscopic survey of young stars with low extinction in Orion A
• Overview of the Orion Complex
• Probing the evolving massive star population in Orion with kinematic and radioactive tracers
• Chemical pattern across the young associations ONC and OB1b
• Differential abundances of open clusters and their tidal tails: chemical tagging and chemical homogeneity
• 3D Dust Mapping Reveals that Orion Forms Part of a Large Ring of Dust
• Elemental abundances of low-mass stars in the young clusters 25 Ori and lambda Ori
• The Gaia-ESO Survey: the first abundance determination of the pre-main-sequence cluster Gamma Velorum
• Discovery of a 21 Myr old stellar population in the Orion complex
• Discovery of new stellar groups in the Orion complex
• The APOGEE-2 Survey of the Orion Star Forming Complex: I. Target Selection and Validation with early observations
• The stellar IMF of Galactic clusters and its evolution
• Supernovae in the Orion: the missing link in the star forming history of the region
• On the determination of oxygen abundances in chromospherically active stars
• System IMF of the 25 Ori Group from Planetary-Mass Objects to Intermediate/High-Mass Stars
• Characterizing the stellar population of NGC 1980
• Oxygen abundance of open cluster dwarfs

Cited by in corpus (11)

• The homogeneity of the star forming environment of the Milky Way disk over time
• The physical properties of Cluster Chains
• The consistency of chemical clocks among coeval stars
• Stellar Properties for a Comprehensive Collection of Star Forming Regions in the SDSS APOGEE-2 Survey
• ABYSS I: Targeting strategy for APOGEE & BOSS young star survey in SDSS-V
• A GALAH View of the Chemical Homogeneity and Ages of Stellar Strings Identified in Gaia
• The NEMESIS Catalogue of Young Stellar Objects for the Orion Star Formation Complex. I. General description of data curation
• The GALAH survey: Improving chemical abundances using star clusters
• Stellar Population Astrophysics (SPA) with the TNG: NLTE atmospheric parameters and abundances of giant stars in 33 Open Clusters
• Multiple stellar populations at less evolved stages-III: a possible helium spread in NGC 2210
• Functional Data Analysis for Extracting the Intrinsic Dimensionality of Spectra: Application to Chemical Homogeneity in the Open Cluster M67