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44 papers · 2 filters
The deceleration of Giant Herbig-Haro Flows
Elisabete M. de Gouveia Dal Pino
It has been recently discovered that spatially separated Herbig-Haro objects, once considered unrelated, are linked within a chain that may extend for parsecs in either direction o…
Physical conditions in QSO absorbers from fine-structure absorption lines
A. I. Silva, S. M. Viegas
We calculate theoretical population ratios of the ground fine-structure levels of some atoms/ions which typically exhibit UV lines in the spectra of QSO absorbers redward the Ly-al…
Magnetic field effects on the thermonuclear combustion front of Chandrasekhar mass white dwarfs
Cristian R. Ghezzi, Elisabete M. de Gouveia Dal Pino, Jorge E. Horvath
The explosion of a type Ia supernova starts in a white dwarf as a laminar deflagration at the center of the star and soon several hydrodynamic instabilities, in particular, the Ray…
Helium contamination from the progenitor stars of planetary nebulae: The He/H radial gradient and the Delta Y/Delta Z enrichment ratio
W. J. Maciel
In this work, two aspects of the chemical evolution of 4He in the Galaxy are considered on the basis of a sample of disk planetary nebulae (PN). First, an application of correction…
On the Influence of Magnetic Fields on the Structure of Protostellar Jets
Adriano H. Cerqueira, Elisabete M. de Gouveia Dal Pino
We here present the first results of fully three-dimensional (3-D) MHD simulations of radiative cooling pulsed (time-variable) jets for a set of parameters which are suitable for p…
Metallicity estimates for A-, F-, and G-type stars from the Edinburgh-Cape blue object survey
T. C. Beers, S. Rossi, D. O'Donoghue +4
The Edinburgh-Cape Blue Object Survey is an ongoing project to identify and analyse a large sample of hot stars selected initially on the basis of photographic colours (down to a m…