Navegação por Assunto "Galaxia"
Resultados 1-20 de 51
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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 ... -
Os aglomerados globulares NGC 6366 e NGC 6397
(2009) [Dissertação]Esse trabalho teve como objetivo o estudo dos aglomerados globulares NGC 6366 e NGC 6397, que estão classificados entre os mais próximos do Sol, através do ajuste de isócronas aos dados fotométricos obtidos em B (4200Å) e ... -
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 ... -
Análise fotométrica e espectroscópica de aglomerados abertos da galáxia
(2015) [Dissertação]Distributions of age, distance and chemical composition of stars in different Galactic environments are important to trace back the star formation history and the Galaxy formation event. As tracers of the thin disk, open ... -
An independent method for determining the age of the universe
(1987) [Artigo de periódico]The oldest white dwarf stars in the solar neighborhood are still observable, and their luminosity distribution can be used to determine directly the age of the Galactic disk and, somewhat less directly, the age of the ... -
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 catalogue of dust clouds in the Galaxy
(2002) [Artigo de periódico]In this study 21 catalogues of dust clouds in the Galaxy were cross-identified by taking into account available properties such as position, angular dimensions, opacity class and velocity. An initial list of ≈6500 entries ... -
Chemodynamics of the Milky Way I. The first year of APOGEE data
(2014) [Artigo de periódico]Context. The Apache Point Observatory Galactic Evolution Experiment (APOGEE) features the first multi-object high-resolution fiber spectrograph in the near-infrared ever built, thus making the survey unique in its capabilities: ... -
Constraints on thick disc and halo parameters from HST photometry of field stars in the Galaxy
(2001) [Artigo de periódico]We analyse a sample of over 1000 stars from 32 fields imaged in the V and I bands with the Wide Field and Planetary Camera, on board of the Hubble Space Telescope. The fields are located at Galactic latitudes |b| ≥ 15º and ... -
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 ... -
Discovery of three optical open clusters in the Galaxy
(2004) [Artigo de periódico]We report the discovery of three optical open clusters in the Milky Way. Two clusters are in Scutum (Cluster 1 at = 18.44° and b = −0.42°, and Cluster 2 at l= 19.60° and b = −1.02°), thus projected not far from the Galactic ... -
Eight new Milky Way companions discovered in first-year Dark Energy Survey data
(2015) [Artigo de periódico]We report the discovery of eight new Milky Way companions in ~1800 deg2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant ... -
Estudo cinemático de estrelas gigantes em aglomerados abertos da galáxia
(2018) [Trabalho de conclusão de graduação]Os aglomerados estelares são essenciais para estudar a idade, a distribuição espacial, a dinâmica, a cinemática e a composição química de diferentes populações estelares em diferentes componentes Galácticas. Neste projeto, ... -
Exploring FSR open cluster candidates within ιΔι = 20º of the Galactic anticentre
(2008) [Artigo de periódico]Context. We investigate the nature of a sample of star cluster candidates detected as stellar overdensities towards the Galactic anticentre. Aims. Taken from the catalogue of Froebrich, Scholz, and Raftery (FSR), the sample ... -
First cosmology results using SNe Ia from the dark energy survey : analysis, systematic uncertainties, and validation
(2019) [Artigo de periódico]We present the analysis underpinning the measurement of cosmological parameters from 207 spectroscopically classified SNe Ia from the first 3 years of the Dark Energy Survey Supernova Program (DES-SN), spanning a redshift ... -
Foreground and background dust in star cluster directions
(2000) [Artigo de periódico]This paper compares reddening values E(B-V) derived from the stellar content of 103 old open clusters and 147 globular clusters of the Milky Way with those derived from DIRBE/IRAS 100 μm dust emission in the same directions. ... -
From light to mass : accessing the initial and present-day Galactic globular cluster mass functions
(2012) [Artigo de periódico] -
HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4
(2001) [Artigo de periódico]We present results from NICMOS Hubble Space Telescope observations of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4, obtained through the filters F110W (1.1 μm) and F160W (1.6 μm) ... -
Integrated spectral analysis of 18 concentrated star clusters in the Small Magellanic Cloud
(2005) [Artigo de periódico]We present in this study flux-calibrated integrated spectra in the range (3600–6800) Å for 18 concentrated SMC clusters. Cluster reddening values were estimated by interpolation between the extinction maps of Burstein & ... -
Investigating the boderline between a young star cluster and a small stellar association : a test case with Bochum 1
(2008) [Artigo de periódico]Context. Usually, a loose stellar distribution can be classified as an OB stellar group, an association, or a young open cluster. We compare data with the typical OB association Vul OB1. Aims. Here, we discuss the nature ...
