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7 papers · 1 filter
Effective temperature of ionizing stars of extragalactic HII regions
O. L. Dors, G. F. Hagelle, M. V. Cardaci +1
The effective temperature (Teff) of the radiation field of the ionizing star(s) of a large sample of extragalactic HII regions was estimated using the R= log([OII](3727)/[OIII]5007…
Infrared complex refractive index of astrophysical ices exposed to cosmic rays simulated in the laboratory
W. R. M. Rocha, S. Pilling, A. L. F. de Barros +3
In dense and cold regions of the interstellar medium (ISM), molecules may be adsorbed onto dust grains to form the ice mantles. Once formed, they can be processed by ionizing radia…
SOAR observations of the high-viscosity accretion disc of the dwarf nova V4140 Sagitarii in quiescence and in outburst
Raymundo Baptista, Bernardo W. Borges, Alexandre S. Oliveira
We report the analysis of 22 B-band light curves of the dwarf nova V4140 Sgr obtained with SOI/SOAR during two nights along the decline of a superoutburst in 2006 Sep 12-24 and in…
Exploratory Spectroscopy of Magnetic Cataclysmic Variables Candidates and Other Variable Objects
A. S. Oliveira, C. V. Rodrigues, D. Cieslinski +5
The increasing number of synoptic surveys made by small robotic telescopes, such as the photometric Catalina Real-Time Transient Survey (CRTS), represents a unique opportunity for…
Mid Infrared View of the High Mass Star Formation Region W51A
Cassio L. Barbosa, Robert D. Blum, Augusto Damineli +2
In this paper we present the results of a mid infrared study of G49.5-0.4, or W51A, part of the massive starbirth complex W51. Combining public data from the IRAC camera,…
Comparison of solar radio and EUV synoptic limb charts during the present solar maximum
A. J. Oliveira e Silva, C. L. Selhorst, P. J. A. Simões +1
The present solar cycle is particular in many aspects: it had a delayed rising phase, it is the weakest of the last 100 years, and it presents two peaks separated by more than one…