415 citations
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7 papers · 1 filter
Chromospherically young, kinematically old stars
H. J. Rocha-Pinto, B. V. Castilho, W. J. Maciel
We have investigated a group of stars known to have low chromospheric ages, but high kinematical ages. Isochrone, chemical and lithium ages are estimated for them. The majority of…
ESO 603-G21: A strange polar-ring galaxy
V. P. Reshetnikov, M. Faundez-Abans, M. de Oliveira-Abans
We present the results of B, V, R surface photometry of ESO603-G21 - a galaxy with a possible polar ring. The morphological and photometric features of this galaxy are discussed. T…
Asteroseismology and forced oscillations of HD 209295, the first member of two classes of pulsating star
G. Handler, L. A. Balona, R. R. Shobbrook +9
We report the discovery of both intermediate-order gravity mode and low-order pressure mode pulsation in the same star, HD 209295. It is therefore both a gamma Doradus and a delta…
Population Synthesis in the Blue II. The Spectroscopic Age of 47 Tucanae
Ricardo P. Schiavon, S. M. Faber, James A. Rose +1
We develop a new set of models for intermediate-metallicity single stellar populations in the blue/optical region and use those models to determine the spectroscopic age of 47 Tuc.…
Population Synthesis in the Blue I. Synthesis of the Integrated Spectrum of 47 Tucanae from its Color-Magnitude Diagram
Ricardo P. Schiavon, S. M. Faber, Bruno V. Castilho +1
We perform an empirical synthesis of the blue integrated spectrum of the metal-rich globular cluster 47 Tucanae, based directly on the color-magnitude diagram of the cluster couple…
The Extended R CrA Young Association
G. R. Quast, C. A. O. Torres, R. de la Reza +2
Observing ROSAT sources in an area covering ~30% of the Southern Hemisphere, including the R CrA Association, we found evidences that this nearby association may be much larger tha…