A FOSSIL BULGE GLOBULAR CLUSTER REVEALED BY VERY LARGE TELESCOPE MULTI-CONJUGATE ADAPTIVE OPTICS
- Dipartimento di Astronomia, Universita di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova (Italy)
- Instituto de Astronomia, Geofisica e Ciencias Atmosfericas da USP, Rua do Matao 1226, Sao Paulo 05508-900 (Brazil)
- European Southern Observatory, Casilla 19001, Santiago 19 (Chile)
- Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, CP 15051, Porto Alegre 91501-970 (Brazil)
- Astronomical Institute, Academy of Sciences of the Czech Republic, Bo cnI II 1401/1a, CZ-141 31 Prague (Czech Republic)
The globular cluster HP 1 is projected on the bulge, very close to the Galactic center. The Multi-Conjugate Adaptive Optics Demonstrator on the Very Large Telescope allowed us to acquire high-resolution deep images that, combined with first epoch New Technology Telescope data, enabled us to derive accurate proper motions. The cluster and bulge fields' stellar contents were disentangled through this process and produced an unprecedented definition in color-magnitude diagrams of this cluster. The metallicity of [Fe/H] {approx} -1.0 from previous spectroscopic analysis is confirmed, which together with an extended blue horizontal branch imply an age older than the halo average. Orbit reconstruction results suggest that HP 1 is spatially confined within the bulge.
- OSTI ID:
- 21579990
- Journal Information:
- Astrophysical Journal, Vol. 737, Issue 1; Other Information: DOI: 10.1088/0004-637X/737/1/31; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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