Navegação por Assunto "Fotometria"
Resultados 41-55 de 55
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Novas calibrações de cores intrínsecas no infravermelho e aplicações em estudos de extinção
(1998) [Resumo publicado em evento] -
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 ... -
A photometric and spectroscopic study of the southern open clusters Pismis 18, Pismis 19, NGC 6005, and NGC 6253
(1998) [Artigo de periódico]CCD observations in the B, V , and I passbands have been used to generate color-magnitude diagrams (CMDs) for the southern open cluster candidates Pismis 18, Pismis 19, and NGC 6005, as well as for the old open cluster NGC ... -
Spectrophotometry of globular clusters in NGC 5128 (centaurus a) : determination of their metallicities
(1996) [Artigo de periódico]We have carried out spectrophotometry in the range 3600–9700Å of five globular clusters in NGC 5128 for which previous photometric studies suggested a high metal content. We compare the equivalent widths of a set of metallic ... -
Study of the interacting system NGC 6845
(1999) [Artigo de periódico]We present optical spectroscopy, B, V , R, and I CCD photometry, and VLA neutral hydrogen observations of the interacting quartet NGC 6845, also know as Klemola 30. NGC 6845 A, the dominant component, sports a broad and ... -
The dust content and opacity of actively star-forming galaxies
(2000) [Artigo de periódico]We present far-infrared (FIR) photometry at 150 and 205 μm of eight low-redshift starburst galaxies obtained with the Infrared Space Observatory (ISO) ISOPHOT. Five of the eight galaxies are detected in both wave bands, ... -
The globular cluster ngc 6540
(1994) [Artigo de periódico]We have carried out U BV I and Gunn z CCD photometry and integrated spectroscopy in the range λλ3700-10 000 Å of NGC 6540, which was previously classified as an open cluster. The observations indicate that we are dealing ... -
The metal-rich bulge globular cluster NGC 6401
(1999) [Artigo de periódico]We present V and I photometry for the bulge globular cluster NGC 6401 for the first time. The Colour-Magnitude Diagram reveals a red horizontal branch, and the cluster is metalrich ([Fe/H] ≈ -0.7). NGC 6401 is located at ... -
The old metal-poor open cluster ESO 92-SC05 : accreted from a dwarf galaxy?
(2008) [Artigo de periódico]The study of old open clusters outside the solar circle can bring constraints on formation scenarios of the outer disc. In particular, accretion of dwarf galaxies has been proposed as a likelymechanism in the area. We use ... -
The phenomenon of multiple stellar population in galactic globular clusters through multi-band photometry and Gaia
(2023) [Dissertação]The phenomenon of Multiple Stellar Populations (MSPs) is present in all well studied massive Globular Clusters (GCs) of the Milky Way Galaxy. Both spectroscopic and photometric studies have established that these objects ... -
V, i photometry of the metal-rich bulge globular cluster terzan 2
(1997) [Artigo de periódico]We present for the rst time optical colour magnitude diagrams of the globular cluster Terzan 2, in the V, I colours. The horizontal branch is red. The red giant branch morphology can be fitted with that of 47 Tuc, but ... -
VLT-UVES abundance analysis of four giants in NGC 6553
(2006) [Artigo de periódico]Context. Metal-rich globular clusters trace the formation of bulges. Abundance ratios in the metal-rich globular clusters such as NGC 6553 can constrain the formation timescale of the Galactic bulge. Aims. The purpose of ... -
Whole earth telescope observations and seismological analysis of the cool zz ceti star gd 154
(1996) [Artigo de periódico]This paper presents the results of high speed photometric observations of the cool variable DA white dwarf (DAV) GD 154 obtained with the Whole Earth Telescope. GD 154 is one of the coolest pulsating DA white dwarfs and ... -
Whole earth telescope observations of am canum venaticorum-discoseismology at last
(1998) [Artigo de periódico]We report the results of 143.2 hours of time-series photometry over a 12 day period for AM CVn (= HZ 29) as part of the Whole Earth Telescope (WET) project.ˡ This star is believed to be an ultra-short period cataclysmic ... -
Whole earth telescope observations of the interacting binary white dwarf v803 cen in its low state
(1990) [Artigo de periódico]Using a network of observatories in the southern hemisphere, high-speed photometry of the interacting binary white dwarf (IBWD) V803 Cen in its low state is presented. Because of the faintness of the system, the 1611-s ...
