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- Valongo ObservatoryBR382 papers
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32 papers · 1 filter
Modeling the Historical Flux of Planetary Impactors
David Nesvorny, Fernando Roig, William F. Bottke
The impact cratering record of the Moon and the terrestrial planets provides important clues about the formation and evolution of the Solar System. Especially intriguing is the epo…
Fluorine in the Solar neighborhood: No evidence for the neutrino process
H. Jönsson, N. Ryde, E. Spitoni +5
Asymptotic Giant Branch stars are known to produce `cosmic' fluorine but it is uncertain whether these stars are the main producers of fluorine in the Solar neighborhood or if any…
Galactic structure in the outer disk: the field in the line of sight to the intermediate-age open cluster Tombaugh 1
Giovanni Carraro, Joao Victor Sales Silva, Christian Moni Bidin +1
We employ optical photometry and high-resolution spectroscopy to study a field toward the open cluster Tombaugh 1, where we identify a complex population mixture, that we describe…
Magnetic field structure in single late-type giants: The weak G-band giant 37 Comae from 2008 to 2011
Svetla Tsvetkova, Pascal Petit, Renada Konstantinova-Antova +5
This work studies the magnetic activity of the late-type giant 37 Com. This star belongs to the group of weak G-band stars that present very strong carbon deficiency in their photo…
CODEX Weak Lensing: Concentration of Galaxy Clusters at z ~ 0.5
N. Cibirka, E. S. Cypriano, F. Brimioulle +13
We present a stacked weak lensing analysis of 27 richness selected galaxy clusters at in the CODEX survey. The fields were observed in 5 bands wit…
Chemical Abundances of M-dwarfs from the APOGEE Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186
Diogo Souto, Katia Cunha, D. A. Garcia-Hernandez +18
We report the first detailed chemical abundance analysis of the exoplanet-hosting M-dwarf stars Kepler-138 and Kepler-186 from the analysis of high-resolution ( 22,500) $…