Navegação Ciências Exatas e da Terra por Autor "Ortolani, Sergio"
Resultados 1-20 de 84
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Age and metallicity distribution of the galactic bulge from extensive optical and near-IR stellar photometry
(2003) [Artigo de periódico]We present a new determination of the metallicity distribution, age, and luminosity function of the Galactic bulge stellar population. By combining near-IR data from the 2MASS survey, from the SOFI imager at ESO NTT and ... -
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 ... -
AL 3 (BH261) : a new globular cluster in the galaxy
(2006) [Artigo de periódico]AL 3 (BH 261), previously classified as a faint open cluster candidate, is shown to be a new globular cluster in the Milky Way, by means of B, V, and I color-magnitude diagrams. The main feature of AL 3 is a prominent blue ... -
B and V photometry of the metal-rich bulge globular cluster NGC 6304
(2000) [Artigo de periódico]We presentBandVphotometry of the bulge globular cluster NGC 6304. We derive a reddening E(B-V) 0.5 and a distance from the Sun d 6 kpc. From the red giant branch morphology we estimate that the metallicity of NGC 6304 is ... -
Bh 176 and am-2 : globular or open clusters?
(1995) [Artigo de periódico]We have obtained VI photometry for two low Galactic latitude star clusters: BH 176 and AM-2, using the 2.2 m and the 3.5 m NTT telescopes at ESO. Their VI colour-magnitude diagrams reveal that: BH 176 may be a globular ... -
Blanketing effects in the very metal-rich bulge globular cluster terzan 1
(1993) [Artigo de periódico]We present BVRI and Gunn z CCD photometry for the bulge metal-rich globular cluster Terzan 1. The RGB shows an anomalous shape and the HB is extremely red. lt is projected on a very metal-rich bulge population. We demonstrate ... -
B, V and I photometry of the intermediate metallicity bulge globular clusters NGC 6325 and NGC 6355
(2003) [Artigo de periódico]Colour-Magnitude Diagrams are presented for the globular clusters NGC 6325 and NGC 6355. These clusters are embedded in crowded bulge fields. Both clusters are concentrated and have blue Horizontal Branches, and NGC 6325 ... -
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 ... -
Chrono-chemodynamical analysis of the globular cluster NGC 6355 : looking for the fundamental bricks of the Bulge
(2023) [Artigo de periódico]The information on Galactic assembly time is imprinted on the chemodynamics of globular clusters. This makes them important probes that help us to understand the formation and evolution of the Milky Way. Discerning between ... -
Colour-magnitude analysis of five old open clusters
(2005) [Artigo de periódico]The Galileo Telescope was used to carry out BV photometry of five faint open clusters, for which no Colour Magnitude Diagrams were available in the literature. The clusters Berkeley 24, Berkeley 35, Berkeley 78, PWM 1, and ... -
Colour-magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712
(2000) [Artigo de periódico]We present V and I photometry for NGC 5986 and B and V for NGC 6712. NGC 5986 has a blue extended horizontal branch, while NGC 6712 has a composite red and blue horizontal branch, where the latter extends to unusual bluer ... -
Colour magnitude diagrams of the moderately metal-rich globular clusters NGC 6569 and Palomar 11
(2001) [Artigo de periódico]For the first time Colour-Magnitude Diagrams are presented for NGC 6569 and Palomar 11. NGC 6569 is a rather concentrated cluster whereas Palomar 11 is loose and sparsely populated. Cluster parameters are derived from V ... -
Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies
(2013) [Artigo de periódico]Context. The search for Milky Way faint satellite galaxies and star clusters has been intensified in recent years thanks to the Sloan Digital Sky Survey (SDSS), and other efforts to verify candidate objects. Aims. We ... -
A deep view of a fossil relic in the Galactic bulge : the Globular Cluster HP1
(2019) [Artigo de periódico] -
Detection of Ks-excess stars in the 14 Myr open cluster NGC 4755
(2006) [Artigo de periódico]Aims. We derive the structure, distribution of MS and PMS stars and dynamical state of the young open cluster NGC4755. We explore the possibility that, at the cluster age, some MS and PMS stars still present infrared ... -
Distances of the bulge globular clusters terzan 5, Liller 1, UKS 1, and Terzan 4 based on HST NICMOS photometry
(2007) [Artigo de periódico]Context. A large number of pulsars and X-rays sources are detected in globular clusters. To understand the structure and content of these clusters, accurate distances are required. Aims. We derive the distances of Terzan ... -
ESO 280-SC06 : a new globular cluster in the galaxy
(2000) [Artigo de periódico]By means of VI CCD photometry we identify a new globular cluster in the Galaxy: ESO 280−SC06. The images and Colour Magnitude Diagrams indicate that we are dealing with a sparsely populated globular cluster, showing a ... -
Field color magnitude diagram analysis along the bulge major axis
(1993) [Artigo de periódico]We analyze background fields along the bulge major axis away from the Galactic center by 2°.5, 13° and 31°. Our aim is to study the spatial distribution of different steiiar populations. A similar component of young disk ... -
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 1767 - a new globular cluster in the Galaxy
(2007) [Artigo de periódico]
