509 citations
- Universidade de São PauloBR162 papers
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12 papers · 1 filter
Witnessing gas mixing in the metal distribution of the Hickson Compact Group HCG 31
S. Torres-Flores, C. Mendes de Oliveira, P. Amram +3
We present, for the first time, direct evidence that, in a merger of disk galaxies, the preexisting central metallicities will mix as a result of gas being transported in the merge…
A metric space for type Ia supernova spectra
Michele Sasdelli, W. Hillebrandt, G. Aldering +43
We develop a new framework for use in exploring Type Ia Supernova (SN Ia) spectra. Combining Principal Component Analysis (PCA) and Partial Least Square analysis (PLS) we are able…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
G. Piotto, A. P. Milone, L. R. Bedin +23
In this paper we describe a new UV-initiative HST project (GO-13297) that will complement the existing F606W and F814W database of the ACS Globular Cluster (GC) Treasury by imaging…
Stellar Chemical Abundances: In Pursuit of the Highest Achievable Precision
M. Bedell, J. Melendez, J. Bean +3
The achievable level of precision on photospheric abundances of stars is a major limiting factor on investigations of exoplanet host star characteristics, the chemical histories of…
Oxygen abundance distribution in Galactic disc
S. A. Korotin, S. M. Andrievsky, R. E. Luck +3
We have performed a NLTE analysis of the infrared oxygen triplet for a large number of cepheid spectra obtained with the Hobby-Eberly telescope. These data were combined with our p…
High-resolution abundance analysis of red giants in the globular cluster NGC 6522
B. Barbuy, C. Chiappini, E. Cantelli +11
The [Sr/Ba] and [Y/Ba] scatter observed in some galactic halo stars that are very metal-poor stars and in a few individual stars of the oldest known Milky Way globular cluster NGC…