Tracing the origin of moving groups I. The {\gamma} Leo moving group with high resolution spectra from the Subaru Telescope

TL;DR

This study investigates the chemical composition of stars in the { extgamma} Leo moving group using high-resolution spectra, revealing a wide metallicity range and suggesting a dynamical origin linked to Galactic spiral arms.

Contribution

First detailed chemical abundance analysis of the { extgamma} Leo moving group using high-resolution spectra, providing insights into its origin and properties.

Findings

Stars show a wide metallicity distribution.

Abundance ratios are similar to Milky Way disk stars.

Likely originated from dynamical effects related to spiral arms.

Abstract

We present chemical abundances of 15 stars in the {\gamma} Leo moving group based on high-resolution spectra with the Subaru High Dispersion Spectrograph. The sample was picked up by applying wavelet transform to UVW velocity compo- nents of stars in the solar neighbourhood. Both photometric and spectroscopic method have been used to determine the stellar parameters of stars. Abun- dances of 11 elements including Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Y and Ba are measured. Our results show that the member stars display a wide metallicity distribution with abundance ratios similar to Milky way disk stars. We presume that the {\gamma} Leo moving group is originated from dynamical effects probably related to the Galactic spiral arms.