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9 papers · 1 filter
Photodissociation of organic molecules in star-forming regions II: Acetic acid
S. Pilling, A. C. F. Santos, H. M. Boechat-Roberty
Fragments from organic molecule dissociation (such as reactive ions and radicals) can form interstellar complex molecules like amino acids. The goal of this work is to experimental…
Astrobiologically Interesting Stars within 10 parsecs of the Sun
G. F. Porto de Mello, E. F. del Peloso, L. Ghezzi
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…
Do observed metallicity gradients of early-type galaxies support a hybrid formation scenario?
Ricardo L. C. Ogando, Marcio A. G. Maia, Cristina Chiappini +3
We measure radial gradients of the Mg2 index in 15 E-E/S0 and 14 S0 galaxies. Our homogeneous data set covers a large range of internal stellar velocity dispersions (2.0<logsigma<2…
Abundances of Mn, Co and Eu in a sample of 20 F-G disk stars: the influence of hyperfine structure splitting
E. F. del Peloso, K. Cunha, L. da Silva +1
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. We investigate the influence of hyp…
The age of the Galactic thin disk from Th/Eu nucleocosmochronology III. Extended sample
E. F. del Peloso, L. da Silva, G. F. Porto de Mello +1
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…
Destruction of formic acid by soft X-rays in star-forming regions
H. M. Boechat-Roberty, S. Pilling, A. C. F. Santos
Formic acid is much more abundant in the solid state, both in interstellar ices and cometary ices, than in the interstellar gas (ice/gas ~ 10^{4}) and this point remains a puzzle.…