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- National ObservatoryBR701 papers
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8 papers · 2 filters
The age of the Galactic thin disk from Th/Eu nucleocosmochronology II. Chronological analysis
E. F. del Peloso, L. da Silva, L. I. Arany-Prado
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…
The age of the Galactic thin disk from Th/Eu nucleocosmochronology I. Determination of [Th/Eu] abundance ratios
E. F. del Peloso, L. da Silva, G. F. Porto de Mello
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…
Fine structure of the chromospheric activity in Solar-type stars - The Halpha Line
W. Lyra, G. F. Porto de Mello
A calibration of H-alpha as both a chromospheric diagnostic and an age indicator is presented, complementing the works previously done on this subject (Herbig 1985, Pasquini & Pall…
The Aquarius Superclusters II. Spectroscopic and Photometric Data
Cesar A. Caretta, Marcio A. G. Maia, Christopher N. A. Willmer
We present spectroscopic and photometric data for 920 galaxies selected in 68 fields of the Aquarius Cluster Catalog. Typically the 15 brightest candidate members with magnitudes i…
The outflowing disks of B[e] supergiants and unclassified B[e] stars
Michaela Kraus, Marcelo Borges Fernandes
B[e] supergiants are known to possess outflowing cool disks but also some unclassified B[e] stars show clear indications for the presence of a neutral disk. We derive constraints o…
Sub-Galactic Clumps at High Redshift: A Fragmentation Origin?
Andreas Immeli, Markus Samland, Pieter Westera +1
We investigate the origin of the clumpy structures observed at high redshift, like the chain galaxies. We use a three dimensional chemodynamical simulation describing the dynamics…