Chemical Tagging of Stellar Kinematic Groups: The Hyades Supercluster

Tabernero, H. M.; Montes, D.; González Hernández, J. I.
Bibliographical reference

Stellar Clusters & Associations: A RIA Workshop on Gaia. Proceedings. Granada, Spain, May 23 - 27, 2011. Edited by: Alfaro Navarro, E. J.; Gallego Calvente, A. T.; Zapatero Osorio, M. R., pp.391-392

Advertised on:
2011
Number of authors
3
IAC number of authors
1
Citations
1
Refereed citations
0
Description
Stellar Kinematic Groups are kinematical coherent groups of stars which may share a common origin. These groups spread through the Galaxy over time due to tidal effects caused by galactic rotation and disk heating, however some chemical information remains unchanged. The aim of chemical tagging is to show that abundances of every element in the analysis must be homogeneous between members. We have studied the case of the Hyades Supercluster in order to compile a reliable list of members (FGK stars) based on chemical tagging information. This information has been derived from high-resolution echelle spectra obtained during our surveys of late-type stars. For selected northern stars of the Hyades Supercluster, stellar atmospheric parameters (Teff, log(g), Xi and [Fe/H]) have been determined using an automatic code which takes into account the sensibility of iron EWs measured in the spectra. We have derived absolute abundances consistent with galactic abundance trends reported in previous studies. The chemical tagging method has been applied with a carefully differential abundance analysis of each candidate star, using a well-known member of the Hyades cluster as reference.