Navegação Ciências Exatas e da Terra por Assunto "Globular clusters: general"
Resultados 1-20 de 30
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Ages of the bulge globular clusters NGC 6522 and NGC 6626 (M28) from HST proper-motion-cleaned color–magnitude diagrams
(2018) [Artigo de periódico]Bulge globular clusters (GCs) with metallicities [Fe/H]−1.0 and blue horizontal branches are candidates to harbor the oldest populations in the Galaxy. Based on the analysis of HST proper-motion-cleaned color–magnitude ... -
Atypical Mg-poor Milky Way field stars with globular cluster second-generation-like chemical patterns
(2017) [Artigo de periódico]We report the peculiar chemical abundance patterns of 11 atypical Milky Way (MW) field red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE). These atypical giants exhibit strong ... -
Capture of field stars by globular clusters in dense bulge regions
(1997) [Artigo de periódico]The recent detection of a double red giant branch (RGB) in the optical color-magnitude diagram of the bulge globular cluster HP 1—a more populated, metal-poor, steep giant branch corresponding to the cluster itself and ... -
A comparative analysis of the observed white dwarf cooling sequence from globular clusters
(2016) [Artigo de periódico]We report our study of features at the observed red end of the white dwarf cooling sequences for three Galactic globular clusters: NGC 6397, 47 Tucanae and M 4. We use deep colour– magnitude diagrams constructed from ... -
Confirmation of a new metal-poor globular cluster in the galactic bulge
(2018) [Artigo de periódico]We use deep near-IR photometry of the VISTA Variables in the Vía Láctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the physical reality of the candidate globular cluster (GC) Minni 22, ... -
Deep SOAR follow-up photometry of two Milky Way outer-halo companions discovered with Dark Energy Survey
(2018) [Artigo de periódico]We report the discovery of a new star cluster, DES 3, in the constellation of Indus, and deeper observations of the previously identified satellite DES J0222.7−5217 (Eridanus III). DES 3 was detected as a stellar overdensity ... -
Digging deeper into the Southern skies : a compact Milky Way companion discovered in first-year Dark Energy Survey data
(2016) [Artigo de periódico]We use the first-year Dark Energy Survey (DES) data down to previously unprobed photometric depths to search for stellar systems in the Galactic halo, therefore complementing the previous analysis of the same data carried ... -
Discovery of an obscured globular cluster candidate in the bulge
(1994) [Artigo de periódico]The discovery of a previously uncatalogued extended object at a19so = 17h 21m 508 and 81950 = -24° 15' 44" is reported. The size (d 60") and appearance on the ESO R Atlas field 519 are similar to those of several reddened ... -
A fossil bulge globular cluster revealed by very large telescope multi-conjugate adaptive optics
(2011) [Artigo de periódico]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, ... -
FSR 1716 : a new Milky Way globular cluster confirmed using VVV RR Lyrae stars
(2017) [Artigo de periódico]We use deep multi-epoch near-IR images of the VISTA Variables in the Vía Láctea (VVV) Survey to search for RR Lyrae stars toward the Southern Galactic plane. Here, we report the discovery of a group of RR Lyrae stars close ... -
Globular clusters in the inner Galaxy classified from dynamical orbital criteria
(2020) [Artigo de periódico]Globular clusters (GCs) are the most ancient stellar systems in the Milky Way. Therefore, they play a key role in the understanding of the early chemical and dynamical evolution of our Galaxy. Around 40 per cent of them ... -
Globular clusters within five grade of the galactic center
(1998) [Artigo de periódico]In the recent years we have concentrated efforts to collect Colour-Magnitude Diagrams of the globular clusters projected in the central parts of the Galaxy. So far we were able to gather photometric data in the V, I and ... -
Iron-peak elements Sc, V, Mn, Cu, and Zn in Galactic bulge globular clusters
(2018) [Artigo de periódico]Aims. Globular clusters are tracers of the history of star formation and chemical enrichment in the early Galaxy. Their abundance pattern can help understanding their chemical enrichment processes. In particular, the ... -
J-PLUS: a wide-field multi-band study of the M 15 globular cluster : evidence of multiple stellar populations in the RGB
(2019) [Artigo de periódico]Context. As a consequence of internal and external dynamical processes, Galactic globular clusters (GCs) have properties that vary radially. Wide-field observations covering the entire projected area of GCs out to their ... -
Lifting the dust veil from the globular cluster Palomar 2
(2020) [Artigo de periódico]This work employs high-quality Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) F606W and F814W photometry to correct for the differential reddening affecting the colour–magnitude diagram (CMD) of the poorly ... -
Mapping the differential reddening in globular clusters
(2013) [Artigo de periódico]We build differential-reddening maps for 66 Galactic globular clusters (GCs) with archival Hubble Space Telescope WFC/ACS F606W and F814W photometry. Because of the different GC sizes (characterized by the half-light radius ... -
Multichromatic colour–magnitude diagrams of the globular cluster NGC 6366
(2013) [Artigo de periódico]We present multichromatic isochrone fits to the colour–magnitude data of the globular cluster NGC 6366, based on Hubble Space Telescope Advanced Camera for Surveys/Wide Field Channel and Southern Astrophysical Research ... -
Near-infrared integrated spectra of Galactic globular clusters : testing simple stellar population models
(2011) [Artigo de periódico]We present SOAR/OSIRIS cross-dispersed near-infrared (NIR) integrated spectra of 12 Galactic globular clusters that are employed to test Maraston NIR evolutionary population synthesis models, and to provide spectral ... -
New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge
(2014) [Artigo de periódico]Context. VISTA Variables in the Vía Láctea (VVV) is one of six ESO Public Surveys using the 4 meter Visible and Infrared Survey Telescope for Astronomy (VISTA). The VVV survey covers the Milky Way bulge and an adjacent ... -
A new Milk Way halo star cluster in the southern galactic sky
(2013) [Artigo de periódico]We report on the discovery of a new Milky Way (MW) companion stellar system located at (αJ 2000, δJ 2000) = (22h10 m 43 s. 15,14º56'58".8). The discovery was made using the eighth data release of SDSS after applying an ...
