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277 papers · 1 filter
The Northern Sky Optical Cluster Survey III: A Cluster Catalog Covering Pi Steradians
R. R. Gal, P. A. A. Lopes, R. R. de Carvalho +3
We present the complete galaxy cluster catalog from the Northern Sky Optical Cluster Survey, a new, objectively defined catalog of candidate galaxy clusters at z<0.25 drawn from th…
On the Nature of Fossil Galaxy Groups: Are they really fossils ?
F. La Barbera, R. R. de Carvalho, I. G. de la Rosa +3
We use SDSS-DR4 photometric and spectroscopic data out to redshift z~0.1 combined with ROSAT All Sky Survey X-ray data to produce a sample of twenty-five fossil groups (FGs), defin…
A 2MASS Analysis of the Stability of Southern Bok Globules
Germán A. Racca, José W. S. Vilas-Boas, Ramiro de la Reza
We used near-infrared 2MASS data to construct visual extinction maps of a sample of Southern Bok globules utilizing the NICE method. We derived radial extinction profiles of dense…
Hαspectropolarimetry of RY Tau and PX Vul
A. Pereyra, A. M. Magalhães, F. X. de Araújo
Aims: To detect line effects using spectropolarimetry in order to find evidence of rotating disks and their respective symmetry axes in T Tauri stars. Methods: We used the IAGPOL i…
Dynamical evolution and spectral characteristics of the stellar group Mamajek 2
E. Jilinski, V. G. Ortega, R. de la Reza +2
The dynamical evolution of the recently detected stellar group Mamajek 2 is studied by means of its past 3D orbit. The past orbits of the open clusters NGC 2516 and Persei, bel…
Transiting exoplanets from the CoRoT space mission VI. CoRoT-Exo-3b: The first secure inhabitant of the brown-dwarf desert
M. Deleuil, H. J. Deeg, R. Alonso +2
Context. The CoRoT space mission routinely provides high-precision photometric measurements of thousands of stars that have been continuously observed for months. Aims. The discove…