210 citations · 258 across the 2 of their papers we have counts for
10 papers
He II 4686 in eta Carinae: collapse of the wind-wind collision region during periastron passage
M. Teodoro, A. Damineli, J. I. Arias +23
The periodic spectroscopic events in eta Carinae are now well established and occur near the periastron passage of two massive stars in a very eccentric orbit. Several mechanisms h…
Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity
L. Ghezzi, K. Cunha, V. V. Smith +3
The metal content of planet hosting stars is an important ingredient which may affect the formation and evolution of planetary systems. Accurate stellar abundances require the dete…
Neutral material around the B[e] supergiant star LHA 115-S 65: An outflowing disk or a detached Keplerian rotating disk?
Michaela Kraus, Marcelo Borges Fernandes, Francisco X. de Araujo
B[e] supergiants are surrounded by large amounts of hydrogen neutral material, traced by the emission in the optical [OI] lines. This neutral material is most plausibly located wit…
Stellar Parameters for a Sample of Stars with Planets
L. Ghezzi, K. Cunha, F. X. de Araújo +3
The study of chemical abundances in stars with planets is an important ingredient for the models of formation and evolution of planetary systems. In order to determine accurate abu…
The galactic unclassified B[e] star HD 50138. I. A possible new shell phase
Marcelo Borges Fernandes, Michaela Kraus, Olivier Chesneau +4
The observed spectral variation of HD 50138 has led different authors to classify it in a very wide range of spectral types and luminosity classes (from B5 to A0 and III to Ia) and…
Halpha spectropolarimetry of the B[e] supergiant GG Carinae
A. Pereyra, F. X. de Araujo, A. M. Magalhaes +2
Aims. We study the geometry of the circumstellar environment of the B[e] supergiant star GG Car. Methods. We present observations acquired using the IAGPOL imaging polarimeter in c…