Repositório Digital

A- A A+

Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study

.

Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study

Mostrar registro completo

Estatísticas

Título Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study
Autor Cohen, Roger
Mauro, Francesco
Geisler, Doug
Moni Bidin, Christian
Dotter, Aaron Loveren
Bonatto, Charles Jose
Abstract We combine archival Hubble Space Telescope imaging with wide-field near-infrared photometry to study the neglected metal-poor Galactic globular cluster NGC 6544. A high spatial resolution map of differential reddening over the inner portion of the cluster is constructed, revealing variations of up to half of the total reddening, and the resulting corrected color–magnitude diagrams reveal a sparse blue horizontal branch and centrally concentrated blue straggler population, verified via relative proper motions. Using the corrected photometry to investigate the cluster distance, reddening, and age via direct comparison to well-calibrated photometry of clusters with similar metallicities, we estimate (m − M)0 = 11.96, E(B − V ) = 0.79, and an age coeval with M13 to within the relevant uncertainties. Although our data are insufficient to place tight constraints on the reddening law toward NGC6544, we find no strong evidence that it is non-standard at optical or near-infraredwavelengths.We also provide near-infrared fiducial sequences extending nearly 2 mag below the cluster main sequence turnoff, generated from a statistically decontaminated sample of cluster stars. Lastly, we redetermine the cluster center and construct a radial number density profile which is well fit by an atypically flat power law with a slope of about 1.7. We discuss this result, together with a flattened main sequence luminosity function and inverted mass function, in the context of mass segregation and tidal stripping via interactions with Milky Way potential.
Contido em The Astronomical journal. Vol. 148, no. 1 (July 2014), 18, 24 p.
Assunto Aglomerados estelares globulares
Fotometria astronômica
Galaxia
[en] Galaxy: evolution
[en] Globular clusters: general
[en] Globular clusters: individual (NGC 6544)
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108042
Arquivos Descrição Formato
000943284.pdf (16.96Mb) Texto completo (inglês) Adobe PDF Visualizar/abrir

Este item está licenciado na Creative Commons License

Este item aparece na(s) seguinte(s) coleção(ões)


Mostrar registro completo

Percorrer



  • O autor é titular dos direitos autorais dos documentos disponíveis neste repositório e é vedada, nos termos da lei, a comercialização de qualquer espécie sem sua autorização prévia.
    Projeto gráfico elaborado pelo Caixola - Clube de Criação Fabico/UFRGS Powered by DSpace software, Version 1.8.1.