Intrinsic iron spread and a new metallicity scale for Globular Clusters (2009)
Carretta, Eugenio, Bragaglia, Angela, Gratton, Raffaele, D'Orazi, Valentina, Lucatello, Sara
We have collected spectra of about 2000 red giant branch (RGB) stars in 19 Galactic globular clusters (GC) using FLAMES@VLT (about 100 star with GIRAFFE and about 10 with UVES, respectively, in each...
Carretta, Eugenio, Bragaglia, Angela, Gratton, Raffaele, Lucatello, Sara
We present homogeneous abundances for Fe and some of the elements involved in the proton-capture reactions (O, Na, Mg, Al, and Si) for 202 red giants in 17 Galactic globular clusters (GCs) from the...
Properties of second generation stars in Globular Clusters (2008)
Carretta, Eugenio, Bragaglia, Angela, Gratton, Raffaele G., Lucatello, Sara
We present the first results from the analysis of GIRAFFE spectra of more than 1200 red giants stars in 19 Galactic Globular Clusters (GCs), to study the chemical composition of second generation...
The Bologna Open Clusters Chemical Evolution project (in short: BOCCE) (2007)
I present here our project, the Bologna Open Clusters Chemical Evolution (BOCCE) project, aimed at using Open Clusters as tracers of the disk properties and their evolution with time. We are...
Carretta, Eugenio, Recio-Blanco, Alejandra, Gratton, Raffaele G., Piotto, Giampaolo, Bragaglia, Angela
We find a strong correlation between the extension of the Na-O anticorrelation observed in red giant branch (RGB) stars and the high temperature extension of the horizontal branch (HB) blue tails of...
The chemical abundance of the very metal rich old Open Clusters NGC 6253 and NGC 6791 (2007)
Carretta, Eugenio, Bragaglia, Angela, Gratton, Raffaele
In the framework of a project aiming at deriving in a homogeneous way the properties (age, distance, reddening and detailed chemical abundances) of a large sample of old open clusters, we present...
The old open clusters Berkeley 32 and King 11 (2007)
Tosi, Monica, Bragaglia, Angela, Cignoni, Michele
We have obtained CCD BVI imaging of the old open clusters Berkeley 32 and King 11. Using the synthetic colour-magnitude diagram method with three different sets of stellar evolution models of various...
Na-O Anticorrelation and HB. II. The Na-O anticorrelation in the globular cluster NGC 6752 (2007)
Carretta, Eugenio, Bragaglia, Angela, Gratton, Raffaele, Lucatello, Sara, Momany, Yazan
We are studying the Na-O anticorrelation in several globular clusters of different Horizontal Branch (HB) morphology in order to derive a possible relation between (primordial) chemical...
BVI photometry of the very old open cluster Berkeley 17 (2006)
Bragaglia, Angela, Tosi, Monica, Andreuzzi, Gloria, Marconi, Gianni
We have obtained BVI CCD imaging of Berkeley 17, an anticentre open cluster that competes with NGC 6791 as the oldest known open cluster. Using the synthetic colour magnitude diagrams (CMD) technique...
The metallicity of the old open cluster NGC 6791 (2006)
Gratton, Raffaele, Bragaglia, Angela, Carretta, Eugenio, Tosi, Monica
We have observed four red clump stars in the very old and metal-rich open cluster NGC 6791 to derive its metallicity, using the high resolution spectrograph SARG mounted on the TNG. Using a spectrum...
Na-O Anticorrelation And HB I. The Na-O anticorrelation in NGC 2808 (2005)
Carretta, Eugenio, Bragaglia, Angela, Gratton, Raffaele, Leone, Francesco, Recio-Blanco, Alejandra, Lucatello, Sara
We derived atmospheric parameters and elemental abundances of Fe, O and Na for about 120 red giant stars in the Galactic globular cluster NGC 2808. Our results are based on the analysis of...
Bragaglia, Angela, Tosi, Monica
We describe a long term project aimed at deriving information on the chemical evolution of the Galactic disk from a large sample of open clusters. The main property of this project is that all...
Carretta, Eugenio, Bragaglia, Angela, Gratton, Raffaele, Tosi, Monica
We present the analysis of high resolution spectra of six red giant stars in the old open cluster Collinder 261. Reddening values for individual stars, derived from the relation between colours and...
Carretta, Eugenio, Gratton, Raffaele, Lucatello, Sara, Bragaglia, Angela, Bonifacio, Piercarlo
Abundances of C and N are derived from features due to the CH G-band and to the UV CN band measured on high resolution (R ~ 40,000) UVES spectra of more than 40 dwarfs and subgiants in NGC 6397, NGC...
Star-to-star Na and O abundance variations along the red giant branch in NGC 2808 (2004)
Carretta, Eugenio, Bragaglia, Angela, Cacciari, Carla
We report for the first time Na and O abundances from high-resolution, high S/N echelle spectra of 20 red giants in NGC 2808, taken as part of the Science Verification program of the FLAMES...
The type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope (2004)
Chugai, Nikolai N., Blinnikov, Sergei I., Cumming, Robert J., Lundqvist, Peter, Bragaglia, Angela, Filippenko, Alexei V., ...
We present and analyse spectra of the Type IIn supernova 1994W obtained between 18 and 203 days after explosion. During the luminous phase (first 100 d) the line profiles are composed of three major...
Carretta, Eugenio, Gratton, Raffaele, Bragaglia, Angela, Bonifacio, Piercarlo, Pasquini, Luca
We used the UVES spectrograph on Kueyen (VLT UT2) to perform the abundance analysis of stars at the base of the giant branch (RGB) and at the main sequence turn-off in the globular cluster 47 Tuc...
UBVI photometry of the intermediate age open cluster NGC 6939 (2003)
Andreuzzi, Gloria, Bragaglia, Angela, Tosi, Monica, Marconi, Gianni
We present CCD UBVI photometry of the nearby, intermediate age open cluster NGC 6939. Using the synthetic Colour - Magnitude Diagrams technique we estimate the following parameters: age between 1.3...
SN 1994W: evidence of explosive mass ejection a few years before explosion (2003)
Chugai, Nikolai N., Cumming, Robert J., Blinnikov, Sergei I., Lundqvist, Peter, Filippenko, Alexei V., Barth, Aaron J., ...
We present and analyse spectra of the Type IIn supernova 1994W obtained between 18 and 202 days after explosion. During the first 100 days the line profiles are composed of three major components:...
Carretta, Eugenio, Bragaglia, Angela, Cacciari, Carla, Rossetti, Emanuel
We have used spectra obtained as part of the Science Verification program of the FLAMES multi-object spectrograph mounted on Kueyen (VLT-UT2) to perform an abundance analysis of stars along the giant...
Distances and ages of NGC 6397, NGC 6752 and 47 Tuc (2003)
Gratton, Raffaele, Bragaglia, Angela, Carretta, Eugenio, Clementini, Gisella, Desidera, Silvano, Grundahl, Frank, ...
Distances and absolute ages for the globular clusters NGC6397, NGC6752, and 47 Tuc are obtained using Main Sequence Fitting. Accurate reddenings and metal abundances (errors of 0.005 mag and 0.04...
Intermediate age open clusters: Collinder 110 (2003)
Bragaglia, Angela, Tosi, Monica
We present CCD BV photometry of the intermediate age open cluster Collinder 110, a nearby, scarcely populated, and poorly studied system. There is no literature information on the metallicity, so we...
Discovery of the optical counterpart and early optical observations of GRB 990712 (2000)
Sahu, Kailash C., Vreeswijk, P. M., Bakos, Gaspar A., Menzies, John W., Bragaglia, Angela, Frontera, Filippo, ...
We present the discovery observations of the optical counterpart of the gamma-ray burst GRB 990712 taken 4.16 hr after the outburst and discuss its light curve observed in the V, R, and I bands...
Discovery of the optical counterpart and early optical observations of GRB 990712 (2000)
Sahu, Kailash C., Vreeswijk, P. M., Bakos, Gaspar A., Menzies, John W., Bragaglia, Angela, Frontera, Filippo, ...
We present the discovery observations of the optical counterpart of the gamma-ray burst GRB 990712 taken 4.16 hr after the outburst and discuss its light curve observed in the V, R, and I bands...
Mixing along the Red Giant Branch in Metal-poor Field Stars (1999)
Carretta, Eugenio, Gratton, Raffaele, Sneden, Chris, Bragaglia, Angela
We have determined Li, C, N, O, Na, and Fe abundances, and 12C/13C isotopic ratios for a sample of 62 field metal-poor stars (plus 43 taken from the literature). This large sample was used to show...
First Dredge-Up and further Mixing Mechanisms along the Red Giant Branch in Field Stars (1998)
Carretta, Eugenio, Gratton, Raffaele, Sneden, Chris, Bragaglia, Angela
In this research we use a large sample of field metal-poor stars ([Fe/H]
Carretta, Eugenio, Bragaglia, Angela
We present an improved calibration of photometric metallicity indicators, derived from the new metallicity scale for Globular Clusters presented by Carretta & Gratton (1997) and based on direct high...
Renzini, Alvio, Bragaglia, Angela, Ferraro, Francesco R., Gilmozzi, Roberto, Ortolani, Sergio, Holberg, J. B., ...
Deep Hubble Space Telescope (HST) observations with WFPC2 of the nearby globular cluster NGC 6752 have allowed us to obtain accurate photometry for the cluster white dwarfs (WD). A sample of local...