Please use this identifier to cite or link to this item:
http://hdl.handle.net/1843/64308| Type: | Artigo de Periódico |
| Title: | Investigation of galactic open cluster remnants: the case of NGC 7193 |
| Authors: | Mateus de Souza Angelo João Francisco Coelho dos Santos Junior Wagner José Corradi Barbosa Francisco Ferreira de Souza Maia Andrés Eduardo Piatti |
| Abstract: | Galactic open clusters (OCs) that survive the early gas-expulsion phase are gradually de- stroyed over time by the action of disruptive dynamical processes. Their final evolutionary stages are characterized by a poorly populated concentration of stars called an open cluster remnant (OCR). This study is devoted to assessing the real physical nature of the OCR candidate NGC 7193. GMOS/Gemini spectroscopy of 53 stars in the inner target region were obtained to derive radial velocities and at- mospheric parameters. We also employed photometric and proper motion data. The analysis method consists of the following steps: (i) analysis of the statistical resemblance between the cluster and a set of field samples with respect to the sequences defined in color-magnitude diagrams (CMDs); (ii) a 5-dimensional iterative exclusion routine was employed to identify outliers from kinematical and positional data; (iii) isochrone fitting to the Ks × (J − Ks) CMD of the remaining stars and the dispersion of spectral types along empirical sequences in the (J − H) × (H − Ks) diagram were checked. A group of stars was identified for which the mean heliocentric distance is compatible with that obtained via isochrone fitting and whose metallicities are compatible with each other. Fifteen of the member stars observed spectroscopically were identified together with another 19 probable members. Our results indicate that NGC 7193 is a genuine OCR, of a once very populous OC, for which the following parameters were derived: d = 501±46 pc, t = 2.5±1.2 Gyr, 〈[Fe/H]〉 = −0.17±0.23 and E(B−V ) = 0.05±0.05. Its luminosity and mass functions show depletion of low mass stars, confirming the OCR is in a dynamically evolved state. |
| Subject: | Aglomerados galáticos Estrelas |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Aberto |
| metadata.dc.identifier.doi: | https://doi.org/10.1088/1674-4527/17/1/4 |
| URI: | http://hdl.handle.net/1843/64308 |
| Issue Date: | 2017 |
| metadata.dc.url.externa: | https://iopscience.iop.org/article/10.1088/1674-4527/17/1/4 |
| metadata.dc.relation.ispartof: | Research in Astronomy and Astrophysics |
| Appears in Collections: | Artigo de Periódico |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Investigation of Galactic open cluster remnants.pdf | 4.28 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.