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Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. IV. Two bulge populations
Gravitational lensing: micro—Galaxy: bulge —Galaxy: formation —Galaxy: evolution —Stars: abundances
2011/10/20
Based on high-resolution (R~42000 to 48000) and high signal-to-noise (S/N~50 to 150) spectra obtained with UVES/VLT, we present detailed elemental abundances (O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Zn...
Mining SDSS in search of Multiple Populations in Globular Clusters
Mining SDSS Multiple Populations Globular Clusters
2011/1/10
Several recent studies have reported the detection of an anomalous color spread along the red giant branch (RGB) of some globular clusters (GC) that appears only when color indices including a near ul...
The Birth of a Galaxy: Primordial Metal Enrichment and Population II Stellar Populations
cosmology methods numerical hydrodynamics radiative transfer star formation
2010/11/15
Population III stars first form in dark matter halos with masses around 106M⊙. By definition,
they are metal-free, and their protostellar collapse is driven by molecular hydrogen cooling in the gas-p...
The Deepest HST Color-Magnitude Diagram of M32: Evidence for Intermediate-Age Populations
Local Group—galaxies individual M32 M31—galaxies elliptical and lenticular
2010/11/10
We present the deepest optical color-magnitude diagram (CMD) to date of the local elliptical galaxy M32.We have obtained F435W and F555W photometry based on Hubble Space Telescope ACS/HRC images for a...
Review about populations of Be stars: stellar evolution of extreme stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
Among the emission-line stars, the classical Be stars known for their extreme properties are remarkable. The Be stars are B-type main sequence stars that have displayed at least once in their life emi...
Testing a prediction of the merger origin of early-type galaxies: a correlation between stellar populations and asymmetry
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/29
One of the key predictions of the merger hypothesis for the origin of early-type (elliptical and lenticular) galaxies is that tidally-induced asymmetric structure should correlate with signatures of a...
Panchromatic Averaged Stellar Populations: PaasP
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/24
We study how the spectral fitting of galaxies, in terms of light fractions derived in one spectral region translates into another region, by using results from evolutionary synthesis models. In partic...
Imprints of a heliospheric bowshock on interstellar oxygen populations
heliospheric bowshock interstellar oxygen populations
2009/5/27
It is well known that the nearby interstellar medium represents a partially ionized gas composed by different chemical species, amongst them hydrogen, helium and oxygen as the most abundant elements. ...