Navegação Ciências Exatas e da Terra por Autor "Piatti, Andres E."
Resultados 1-20 de 28
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Ages and metallicities of eight star clusters and their surrounding fields in the inner disc of the Large Magellanic Cloud
(2003) [Artigo de periódico]We present Washington system colour–magnitude diagrams for 8 star clusters and their surrounding fields which, with one exception, lie within the inner parts of the Large Magellanic Cloud (LMC) disc. Careful attention is ... -
Ages and metallicities of five intermediate-age star clusters projected towards the Small Magellanic Cloud
(2001) [Artigo de periódico]Colour–magnitude diagrams are presented for the first time for L32, L38, K28 (L43), K44 (L68) and L116, which are clusters projected on to the outer parts of the Small Magellanic Cloud (SMC). The photometry was carried out ... -
Ages and metallicities of star clusters and surrounding fiels in the outer disk of the Large Magellanic Cloud
(1998) [Artigo de periódico]We present Washington system CT1 color-magnitude diagrams of 13 star clusters and their surrounding fields that lie in the outer parts of the LMC disk (r>4°), as well as a comparison inner cluster. The total area covered ... -
Background galaxies as reddening probes throughout the Magellanic Clouds
(2001) [Artigo de periódico]We study the spectral properties in the range 3600 Å - 6800 Å of the nuclear region of galaxies behind the Magellanic Clouds. The radial velocities clari ed the nature of the objects as background galaxies or extended ... -
Blue-violet spectral evolution of young magellanic cloud clusters
(1995) [Artigo de periódico]We study the integrated spectral evolution in the blue-violet range of 97 blue star clusters in the Magellanic Clouds, from those associated with gas emission to those as old as a few hundred Myr. Some clusters are dominated ... -
BVI photometry and integrated spectroscopy of the very young open clusters Ruprecht 119, NGC 6318 and BH 245
(2000) [Artigo de periódico]We present CCD BV I observations obtained for stars in the fields of the unstudied or poorly studied open clusters Ruprecht 119, NGC6318, and BH245 projected close to the direction towards the Galactic centre.We measured ... -
Composite M/sub v (V-I)/sub 0 diagram for template open clusters
(1998) [Artigo de periódico]New CCD V I photometric data for 10 template open clusters with accurately determined fundamental parameters are presented. From the observed V versus V—I diagrams of the clusters, Ðducial sequences have been defined and ... -
Constraining the LMC cluster age gap : Washington photometry of NGC 2155 and SL 896 (LW 480)
(2002) [Artigo de periódico]We carried out Washington system photometry of the intermediate-age Large Magellanic Cloud (LMC) star clusters NGC2155 and SL 896 (LW480). We derive ages and metallicities from the T1 versus C - T1 colour–magnitude diagrams ... -
Fundamental parameters of the LMC clusters NGC 1836, NGC 1860, NGC 1865, SL 444, LW 224 and SL 548
(2003) [Artigo de periódico]Complementing our recent Washington photometric studies on intermediate age and young Large Magellanic Cloud (LMC) clusters, we now turn our attention to six previously unstudied star clusters in the transition range 200–700 ... -
Fundamental parameters of the moderately young open clusters NGC 5999, NGC 6031, Ruprecht 115 and Ruprecht 120
(1999) [Artigo de periódico]We present CCD BVI Johnson–Cousins photometry for the southern open clusters NGC 5999, NGC 6031, Ruprecht 115 and Ruprecht 120. The sample consists of about 1160 stars reaching down to V ~ 19 mag. From the analysis of the ... -
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 & ... -
Integrated spectral evolution of Galactic open clusters
(2002) [Artigo de periódico]We present a library of 47 open-cluster integrated spectra, mostly obtained at CASLEO (San Juan, Argentina) in the range 3600<λ<7400 Å, which are made available at CDS. The data are combined with previous spectra to obtain ... -
Integrated UBV photometry of 624 star clusters and associations in the Large Magellanic Cloud
(1996) [Artigo de periódico]We present a catalogof integrated UBV photometry of 504 star clusters and 120 stellar associations in the LMC, part ofthem still embedded in emitting gas. We study age groups in terms of equivalent SWB types derived from ... -
A new giant branch clump structure in the Large Magellanic Cloud
(1999) [Artigo de periódico]We present Washington C and T1 CCD photometry of 21 Ðelds located in the northern part of the Large Magellanic Cloud (LMC), and spread over a region of more than 2.5 deg² approximately 6° from the bar. The surveyed areas ... -
Photometric and integrated spectral study of the young open clusters Pismis 22, NGC 6178, NGC 6216 and Ruprecht 130
(2000) [Artigo de periódico]We present CCD observations in the B, V , and I passbands obtained for stars in the fields of the open clusters Pismis 22, NGC6178, NGC6216, and Ruprecht 130, projected not far from the Galactic centre (|l| < 30º , |b| < ... -
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 ... -
A revision of the fundamental parameters of the open cluster Hogg 15 and the projected star WR 47
(2002) [Artigo de periódico]We revise the fundamental parameters of the faint open cluster Hogg 15, for which two recent colour-magnitude diagram (CMD) studies have obtained significantly different ages. In the present study, we combine a series of ... -
A search for old star clusters in the large magellanic cloud
(1997) [Artigo de periódico]There are only a handful of known star clusters in the LMC that are genuinely old, i.e., of similar age to the globular star clusters in the Milky Way. We report the first results of a color-magnitude diagram survey of 25 ... -
Spectral evolution of star clusters in the Large Magellanic Cloud : I. blue concentrated clusters in the range 40-300 Myr
(2006) [Artigo de periódico]Aims. Integrated spectroscopy of a sample of 17 blue concentrated Large Magellanic Cloud (LMC) clusters is presented and its spectral evolution studied. The spectra span the range ≈(3600−6800) Å with a resolution of ≈14Å ... -
Spectroscopic analysis of the candidate globular clusters NGC 1928 and 1939 in the Large Magellanic Cloud
(1999) [Artigo de periódico]The integrated spectral properties in the range 3600±6700 Å of the candidate old clusters NGC 1928 and 1939 in the LMC bar are compared with those of old-and intermediate-age reference LMC clusters, the properties of which ...
