| Texto completo | |
| Autor(es): |
Gregorio-Hetem, Jane
;
Hetem, Annibal
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 533, n. 2, p. 18-pg., 2024-08-23. |
| Resumo | |
Recent studies have identified star clusters with multiple components based on accurate spatial distributions and/or proper motions from Gaia Data Release 3 (DR3), utilizing diverse diagnostics to gain an understanding of subgroup evolution. These findings motivated us to search for subgroups among the objects examined in our previous work, which employed fractal statistics. The present study considers seven open clusters that exhibit significant dispersion in age and/or proper motion distributions, suggesting that they are not single clusters. In order to characterize the stellar groups, we calculate the membership probability using Bayesian multidimensional analysis by fitting the observed proper motion distribution of the candidates. A probability distribution is also used to determine the distance of the cluster, which is obtained from the mean value of the distance modes. The photometry from Gaia DR3 is compared with evolutionary models to estimate the cluster age and total mass. In our sample, double components are found only for Markarian 38 and NGC 2659. The other five clusters are confirmed as being single. The structural parameters, such as Q, Lambda(MSR), and Sigma(LDR), are compared with results from N-body simulations to investigate how the morphology of the stellar clustering evolves. The new results, for a more complete sample of cluster members, provide a better definition of the distribution type (central concentration or substructured region) inferred from the m-s plot. (AU) | |
| Processo FAPESP: | 20/15245-2 - Espectrógrafo multi-objeto (MOSAIC) para o extremely large telescope: espectroscopia de populações estelares na via láctea e em galáxias |
| Beneficiário: | Beatriz Leonor Silveira Barbuy |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |
| Processo FAPESP: | 23/08726-2 - Primeiros estágios da evolução de aglomerados estelares jovens |
| Beneficiário: | Jane Cristina Gregorio-Hetem |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |