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A Fossil Bulge Globular Cluster revealed by VLT Multi-Conjugate Adaptive Optics

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ORTOLANI Sergio BARBUY Beatriz MOMANY Yazan SAVIANE Ivo BICA Eduardo JÍLKOVÁ Lucie SALERNO Gustavo Malta JUNGWIERT Bruno

Rok publikování 2011
Druh Článek v odborném periodiku
Časopis / Zdroj Astrophysical Journal
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www http://iopscience.iop.org/0004-637X/737/1/31/
Doi http://dx.doi.org/10.1088/0004-637X/737/1/31
Obor Astronomie a nebeská mechanika, astrofyzika
Klíčová slova Galactic bulge globular clusters (HP 1)
Popis 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] -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.
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