Name: Wagner Jose Corradi Barbosa

Institution: Universidade Federal de Minas Gerais

e-mail: wag(no-spam)fisica.ufmg.br

Partner Contry: BRA

Science Meeting: Yes

User Meeting: Yes

NGO Staff Meeting: None Selected

Presentation: Yes

Format: Poster

Title: ESO442SC04: An Open Cluster Remnant?

Co-author: Joao Francisco Coelho dos Santos Jr. Francisco Ferreira de Souza Maia

Co-authors' Institutions: Universidade Federal de Minas Gerais Universidade Federal de Minas Gerais

Abstract:

We propose a definitive test on the real physical nature of ESO442SC04, an object which has been listed as a possible open cluster remnant (POCR) by Bica et al. (2001). In order to pursue such analysis, we carried out multi-object spectroscopy of stars in the object area using GMOS-S. By determining their radial velocity and metallicity, in conjunction with 2MASS color-magnitude diagrams and proper motion analyses, we aim at evaluating if the stars form a physical system. Additionally, since the stars are located at a high Galactic latitude, the derived radial velocities and metallicities will allow to characterize them as belonging to one or another Galactic structure, helping to better define the limits of the disk and inner halo. Do these stars show thin disk, thick disk or halo properties? Thus, if the cluster is real, its origin can be inferred from the stars kynematical and chemical properties. Radial velocities were derived by using the cross-correlation technique and metallicities were estimated via equivalent width measurements of metallic lines in the spectral region between 3875A and 5300A. In this work we will present a preliminary discussion of the obtained data.