E. F. Peloso - Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil

E. F. Peloso
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Contact Details

Name
E. F. Peloso
Affiliation
Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil
City
Rio de Janeiro
Country
Brazil

Pubs By Year

Pub Categories

 
Astrophysics (5)
 
Earth and Planetary Astrophysics (1)
 
Solar and Stellar Astrophysics (1)

Publications Authored By E. F. Peloso

Planet searches using the radial velocity technique show a paucity of companions to solar-type stars within ~5 AU in the mass range of ~10 - 80 M$_{\text{Jup}}$. This deficit, known as the brown dwarf desert, currently has no conclusive explanation. New substellar companions in this region help asses the reality of the desert and provide insight to the formation and evolution of these objects. Read More

2005Nov
Affiliations: 1Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil, 2Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil, 3Observatorio Nacional/MCT, Rio de Janeiro, Brazil
Category: Astrophysics

The existence of life based on carbon chemistry and water oceans relies upon planetary properties, chiefly climate stability, and stellar properties, such as mass, age, metallicity and Galactic orbits. The latter can be well constrained with present knowledge. We present a detailed, up-to-date compilation of the atmospheric parameters, chemical composition, multiplicity and degree of chromospheric activity for the astrobiologically interesting solar-type stars within 10 parsecs of the Sun. Read More

2005Jun
Affiliations: 1Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 2Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 3Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 4Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil
Category: Astrophysics

We present Mn, Co and Eu abundances for a sample of 20 disk F and G dwarfs and subgiants with metallicities in the range -0.8 <= [Fe/H] <= +0.3. Read More

2005Jun
Affiliations: 1Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 2Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 3Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil
Category: Astrophysics

The first determination of the age of the Galactic thin disk from Th/Eu nucleocosmochronology was accomplished by us in Papers I and II. The present work aimed at reducing the age uncertainty by expanding the stellar sample with the inclusion of seven new objects - an increase by 37%. A set of [Th/Eu] abundance ratios was determined from spectral synthesis and merged with the results from Paper I. Read More

2004Nov
Affiliations: 1Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 2Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 3Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil
Category: Astrophysics

The purpose of this work is to resume investigation of Galactic thin disk dating using nucleocosmochronology with Th/Eu stellar abundance ratios, a theme absent from the literature since 1990. A stellar sample of 20 disk dwarfs/subgiants of F5 to G8 spectral types with -0.8 <= [Fe/H] <= +0. Read More

2004Nov
Affiliations: 1Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 2Observatorio Nacional/MCT, Rio de Janeiro, Brazil, 3Observatorio do Valongo/UFRJ, Rio de Janeiro, Brazil
Category: Astrophysics

The purpose of this work is to resume investigation of Galactic thin disk dating using nucleocosmochronology with Th/Eu stellar abundance ratios, a theme absent from the literature since 1990. [Th/Eu] abundance ratios for a sample of 20 disk dwarfs/subgiants of F5 to G8 spectral type with -0.8 <= [Fe/H] <= +0. Read More