Migration in the shearing sheet and estimates for young open cluster migration
arXiv:1709.04801 · doi:10.1093/mnras/sty125
Abstract
Using tracer particles embedded in self-gravitating shearing sheet N-body simulations, we investigate the distance in guiding centre radius that stars or star clusters can migrate in a few orbital periods. The standard deviations of guiding centre distributions and maximum migration distances depend on the Toomre or critical wavelength and the contrast in mass surface density caused by spiral structure. Comparison between our simulations and estimated guiding radii for a few young super-solar metallicity open clusters, including NGC 6583, suggests that the contrast in mass surface density in the solar neighbourhood has standard deviation (in the surface density distribution) divided by mean of about 1/4 and larger than measured using COBE data by Drimmel and Spergel. Our estimate is consistent with a standard deviation of 0.07 dex in the metallicities measured from high-quality spectroscopic data for 38 young open clusters (<1 Gyr) with mean galactocentric radius 7-9 kpc.
accepted to MNRAS
References in corpus (16)
- New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
- Riding the Spiral Waves: Implications of Stellar Migration for the Properties of Galactic Disks
- Present-day cosmic abundances. A comprehensive study of nearby early B-type stars and implications for stellar and Galactic evolution and interstellar dust models
- On the mass-to-light ratio of the local Galactic disc and the optical luminosity of the Galaxy
- A cosmic abundance standard: chemical homogeneity of the solar neighbourhood and the ISM dust-phase composition
- CHAOS I: Direct Chemical Abundances for HII Regions in NGC 628
- WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
- The chemical abundance of the very metal rich old Open Clusters NGC 6253 and NGC 6791
- The effect of spiral arm passages on the evolution of stellar clusters
- Early turbulent mixing as the origin of chemical homogeneity in open star clusters
- The Gaia-ESO Survey: Stellar content and elemental abundances in the massive cluster NGC 6705
- The origin and orbit of the old, metal-rich, open cluster NGC 6791: Insights from kinematics
- Accurate age determinations of several nearby open clusters containing magnetic Ap stars
- OCCASO II. Physical parameters and Fe abundances of Red Clump stars in 18 Open Clusters
- Constraints on Radial Migration in Spiral Galaxies I. Analytic Criterion for Capture at Corotation
- Heterogeneity of the Population of Open Star Clusters in the Galaxy