Navegação Ciências Exatas e da Terra por Autor "Ortolani, Sergio"
Resultados 41-60 de 84
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Matching stellar population models to bulge globular clusters
(1997) [Artigo de periódico]We compare observed color-magnitude diagrams (CMDs) of the three metal-rich bulge globular clusters NGC 6553, NGC 6528, and Terzan 5, and integrated spectral energy distributions (SEDs) of NGC 6528, and 47 Tuc, to theoretical ... -
Membership of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553
(2001) [Artigo de periódico]Low resolution spectra of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553 are analysed. Radial velocities and atmospheric parameters are derived in order to check their membership in the clusters. Effective ... -
Metallicity and radial velocity of the second parameter globular cluster Terzan 1 in the galactic bulge
(2002) [Artigo de periódico]Terzan 1 is the globular cluster with closest projection relative to the Galactic center. We report radial velocities and metallicities of 17 stars in order to investigate their membership in the cluster. From the 11 ... -
Metallicity of the star III-17 in the bulge globular cluster NGC 6553
(1992) [Artigo de periódico]CCD échelle spectra were obtained at the 3.6 m telescope at ESO for the star III-17 of the metal-rich globular cluster NGC 6553. This cluster was chosen because it is a relatively dose bulge globular cluster and also it ... -
Metal-rich globular clusters : giant branch morphology as a metallicity Criterion
(1991) [Artigo de periódico]We have obtained VI CCD photometry of the very metal-rich inner bulge globular clusters NGC 6528, NGC 6553 and Ter 1, and of 47 Tuc and NGC 6356, which are usually called metal-rich clusters. We discuss the RGB morphology ... -
Multi-conjugate adaptive optics VLT imaging of the distant old open cluster FSR 1415
(2008) [Artigo de periódico]We employ the recently installed near-infrared Multi-Conjugate Adaptive Optics demonstrator (MAD) to determine the basic properties of a newly identified, old and distant, Galactic open cluster (FSR 1415). The MAD facility ... -
A MUSE study of the inner bulge globular cluster Terzan 9 : a fossil record in the Galaxy
(2019) [Artigo de periódico]Context. Moderately metal-poor inner bulge globular clusters are relics of a generation of long-lived stars that formed in the early Galaxy. Terzan 9, projected at 4°.12 from the Galactic center, is among the most central ... -
NGC 6522 : an intermediate metallicity globular cluster projected on the baade window
(1994) [Artigo de periódico]We studied NGC 6522 colour magnitude diagrams using CCD photometry with BV filters. We have carefully estimated the reddening, which is criticai for Baade Window studies, obtaining E(B-V) = 0.55. We derive for this ... -
NGC 6558 : a blue horizontal branch moderately metal-poor globular cluster in the bulge
(2007) [Artigo de periódico]We present, for the first time, a detailed abundance analysis of five giant stars in the moderately metal-poor bulge globular cluster NGC 6558. Spectra have been obtained at the VLT with the multifiber spectrograph FLAMES ... -
Ngc 6603 : a young rich open cluster towards the bulge
(1993) [Artigo de periódico]We present B, V colour magnitude diagrams of the rich open cluster NGC 6603. A foreground reddening of E(B- V)f = 0.50 and an internal one of E(B- V)i = 0.29 were derived with the additional help of integrated spectra. The ... -
NGC 6749 : a metal-poor halo globular in a disc field rich in mira variables
(1997) [Artigo de periódico]We present V, I photometry of the loose star cluster NGC 6749, and for the first time colour-magnitude diagrams are provided. We confirm that it is a globular cluster and its blue horizontal branch indicates that it is ... -
NTT infrared imaging of star cluster candidates towards the central parts of the Galaxy
(2003) [Artigo de periódico]We address the issue whether the central parts of the Galaxy harbour young clusters other than Arches, Quintuplet and the Nuclear Young Cluster. A large sample of centrally projected cluster candidates has been recently ... -
Ntt v, i, and gunn z colour-magnitude diagrams of liller 1 : a globular cluster as metal-rich as the inner bulge stellar population?
(1996) [Artigo de periódico]We carried out V RI and Gunn z observations of the obscured globular cluster Liller 1. The cluster is so reddened (Av ≈ 9.0) that it is at the detection limit in V. The RGB in I vs. (I–z) shows a strong curvature. Recalling ... -
Ntt vi photometry of the metal-rich and obscured bulge globular cluster terzan 5
(1996) [Artigo de periódico]We study the metal-rich bulge globular cluster Terzan 5 by means of VI colour-magnitude diagrams, with images obtained under exceptional seeing conditions (0.34"–0.50"). Differential reddening is important across the ... -
Open cluster survival within the solar circle : Teutsch 145 and Teutsch 146
(2010) [Artigo de periódico]Teutsch 145 and Teutsch 146 are shown to be open clusters (OCs) orbiting well inside the solar circle, a region where several dynamical processes combine to disrupt most OCs on a timescale of a few 10 8 yr. BVI photometry ... -
A pair of reddened young star clusters in Centaurus northern sample
(2004) [Artigo de periódico]Photometry in the BVI and JHK bands is presented for the first time for the southern open clusters Danks 1 and 2, located in the Centaurus region. They are relatively rich and compact, and projected at approximately 4 ... -
Pfleiderer 2 : identification of a new globular cluster in the galaxy
(2009) [Artigo de periódico]We provide evidence that indicates the star cluster Pfleiderer 2, which is projected in a rich field, as a newly identified Galactic globular cluster. Since it is located in a crowded field, core extraction and decontamination ... -
Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6
(2021) [Artigo de periódico]Context. Palomar 6 (Pal6) is a moderately metal-poor globular cluster projected towards the Galactic bulge. A full analysis of the cluster can give hints on the early chemical enrichment of the Galaxy and a plausible origin ... -
A photometric study of the young open cluster NGC 1220
(2002) [Artigo de periódico]We present UBV CCD observations obtained in the field of the northern open cluster NGC 1220, for which little information is available. We provide also BV CCD photometry of a field 5' northward of NGC 1220 to take into ... -
Proper motions and kinematics of selected bulge globular clusters
(2015) [Artigo de periódico]We computed proper motions of a selected sample of globular clusters projected on the central bulge, employing CCD images gathered along the last 25 yr at the ESO-New Technology Telescope, ESO-Danish and Hubble Space ...
