Navegação Ciências Exatas e da Terra por Assunto "Estrelas"
Resultados 1-18 de 18
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Abundance analysis of APOGEE spectra for 58 metal-poor stars from the bulge spheroid
(2022) [Artigo de periódico]The central part of the Galaxy hosts a multitude of stellar populations, including the spheroidal bulge stars, stars moved to the bulge through secular evolution of the bar, inner halo, inner thick disc, inner thin disc, ... -
Asteroseismology of RXJ 2117+3412, the hottest pulsating PG 1159 star
(2002) [Artigo de periódico]The pulsating PG 1159 planetary nebula central star RXJ 2117+3412 has been observed over three successive seasons of a multisite photometric campaign. The asteroseismological analysis of the data, based on the 37 identified ... -
Carbon stars in lmc clusters revisited
(1996) [Artigo de periódico]Examining the available data for AGB stars in the Large Magellanic Cloud (LMC) clusters, we address the question about the mass interval of low- and intermediate-mass stars which eventually evolve into carbon stars (C ... -
Chemical abundances in the metal-intermediate GC NGC 6723
(2019) [Artigo de periódico]We have performed a detailed spectral analysis of the inner halo Galactic globular cluster (GC) NGC 6723 using high-resolution (R≈ 22 000–48 000) spectra for for 11 red giant branch stars collected with MIKE (Magellan) and ... -
Data release 2 of S-PLUS : accurate template-fitting based photometry covering ∼1000 deg2 in 12 optical filters
(2022) [Artigo de periódico]The Southern Photometric Local Universe Survey (S-PLUS) is an ongoing survey of ∼9300 deg2 in the southern sky in a 12-band photometric system. This paper presents the second data release (DR2) of S-PLUS, consisting of 514 ... -
High-resolution abundance analysis of two individual stars of the bulge globular cluster NCG 6553
(1999) [Artigo de periódico]A detailed abundance analysis of 2 giants of the metal-rich bulge globular cluster NGC6553 was carried out using high resolution échelle spectra obtained at the ESO 3.6m telescope. The temperature calibration of metal-rich ... -
Hot degenerates in the montreal-cambridge-tololo survey. II. Two new hybrid white dwarfs, MCT 0128-3846 and MCT 0453-2933 and the nature of the dab stars
(1994) [Artigo de periódico]We report the discovery, in the course of a survey for high-latitude, ultraviolet-excess objects in the southern hemisphere, of two new hybrid DAB stars. Both objects exhibit a weak He I λ4471 line superposed onto the usual ... -
Increasing the census of ultracool dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data
(2020) [Artigo de periódico]We present the discovery of 255 binary and 6 multiple system candidates with wide (> 5 arcsec) separation composed by ultracool dwarfs (UCDs) companions to stars, plus nine double ultracool dwarf systems. These systems ... -
Já lhe perguntaram... porque não existem estrelas verdes?
(2007) [Artigo de periódico]Resumo não disponível -
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 ... -
Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5
(2022) [Artigo de periódico]We present a catalogue of 362 million stellar parameters, distances, and extinctions derived from Gaia’s Early Data Release (EDR3) cross-matched with the photometric catalogues of Pan-STARRS1, SkyMapper, 2MASS, and AllWISE. ... -
SDSS J124043.01+671034.68 : the partially burned remnant of a low-mass white dwarf that underwent thermonuclear ignition?
(2020) [Artigo de periódico]The white dwarf SDSS J124043.01+671034.68 (SDSS J1240+6710) was previously found to have an oxygen-dominated atmosphere with significant traces of neon, magnesium, and silicon. A possible origin via a violent late thermal ... -
Stellar population gradients in normal and active galaxies
(2001) [Artigo de periódico]We use high signal-to-noise ratio long-slit spectra in the λλ3500–7000-Å range of three early-type (Hubble type S0) normal, two low-ionization nuclear emission region (LINER) and three Seyfert 2 galaxies to make a comparative ... -
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The metal-rich halo tail extended in |z|: a characterization with Gaia DR2 and APOGEE
(2019) [Artigo de periódico]We report an analysis of the metal-rich tail ([Fe/H]>−0.75) of stars located at distances fromthe Galactic plane up to|z|∼10 kpc, observed by the Apache Point Observatory GalacticEvolution Experiment (APOGEE). We examine ... -
Towards a pure ZZ Ceti instability strip
(2007) [Artigo de periódico]Context. We have observed again two stars inside the ZZ Ceti instability strip that were previously classified as not-observed-to-vary (NOV) by Mukadam et al. (2004) and found them to be low-amplitude variables. Some ... -
Utilizando a câmera fotográfica digital como ferramenta para distinguir as cores das estrelas
(2011) [Artigo de periódico] -
A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336-018 (NY Vir)
(2003) [Artigo de periódico]We present results from a multisite (‘Whole Earth Telescope’) photometric campaign on PG 1336−018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) ...
