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On the iron ionization balance of cool stars
M. Tsantaki, N. C. Santos, S. G. Sousa +3
High-resolution spectroscopic studies of solar-type stars have revealed higher iron abundances derived from singly ionized species compared to neutral, violating the ionization equ…
The Tc trend in the Zetta Reticuli system: N spectra - N trends
V. Adibekyan, P. Figueira, E. Delgado Mena +4
It is suggested that the chemical abundance trend with the condensation temperature, Tc , can be a signature of rocky planet formation or accretion. Recently, a strong Tc trend was…
Evidence of a substellar companion around a very young T Tauri star
P. Viana Almeida, J. F. Gameiro, P. P. Petrov +4
We present results from a Near Infrared multi-epoch spectroscopic campaign to detect a young low-mass companion to a T Tauri star. AS 205A is a late-type dwarf (~K5) of ~1 Msun tha…
CNO behaviour in planet-harbouring stars. I Nitrogen abundances in stars with planets
L. Suárez-Andrés, G. Israelian, J. I. González Hernández +4
Carbon, nitrogen, and oxygen (CNO) are key elements in stellar formation and evolution, and their abundances should also have a significant impact on planetary formation and evolut…
Ret, its debris disk, and its lonely stellar companion Ret. Different trends for different spectra
V. Adibekyan, E. Delgado-Mena, P. Figueira +8
Several studies have reported a correlation between the chemical abundances of stars and condensation temperature (known as Tc trend). Very recently, a strong Tc trend was reported…
Fundamental stellar parameters for selected T-Tauri stars in the Chamaeleon and Rho Ophiuchus star-forming regions
David James, Alicia Aarnio, Alexander Richert +4
We present the results of an optical photometry and high-resolution spectroscopy campaign for a modest sample of X-ray selected stars in the Chamaeleon and Rho Ophiuchus star formi…