The 3He(alpha,gamma)7Be S-factor at solar energies: the prompt gamma experiment at LUNA (2008)
Costantini, H., Bemmerer, D., Confortola, F., Formicola, A., Gyürky, Gy., Bezzon, P., ...
The 3He(alpha,gamma)7Be process is a key reaction in both Big-Bang nucleosynthesis and p-p chain of Hydrogen Burning in Stars. A new measurement of the 3He(alpha,gamma)7Be cross section has been...
Precision study of ground state capture in the 14N(p,gamma)15O reaction (2008)
Marta, M., Formicola, A., Gyurky, Gy., Bemmerer, D., Broggini, C., Caciolli, A., ...
The rate of the hydrogen-burning carbon-nitrogen-oxygen (CNO) cycle is controlled by the slowest process, 14N(p,gamma)15O, which proceeds by capture to the ground and several excited states in 15O....
First time-series optical photometry from Antarctica (2008)
Strassmeier, K. G., Briguglio, R., Granzer, T., Tosti, G., DiVarano, I., Savanov, I., ...
Beating the Earth's day-night cycle is mandatory for long and continuous time-series photometry and had been achieved with either large ground-based networks of observatories at different geographic...
AGB stars of the intermediate-age LMC cluster NGC 1846 II. Dredge up along the AGB (2008)
Lebzelter, T., Lederer, M. T., Cristallo, S., Hinkle, K. H., Straniero, O., Aringer, B.
Aims: We investigate the change in the surface abundance of $^{12}$C during the evolution along the AGB, aiming to constrain third dredge-up models. Methods: High-resolution, near-infrared spectra of...
Fluorine in carbon-enhanced metal-poor stars: a binary scenario (2008)
Lugaro, M., De Mink, S. E., Izzard, R. G., Campbell, S. W., Karakas, A. I., Cristallo, S., ...
A super-solar fluorine abundance was observed in the carbon-enhanced metal-poor (CEMP) star HE 1305+0132 ([F/Fe] = +2.90, [Fe/H] = -2.5). We propose that this observation can be explained using a...
Measurement of 25Mg(p; gamma)26Al resonance strengths via gamma spectrometry (2007)
Formicola, A., Best, A., Imbriani, G., Junker, M., Bemmerer, D., Bonetti, R., ...
The COMPTEL instrument performed the first mapping of the 1.809 MeV photons in the Galaxy, triggering considerable interest in determing the sources of interstellar 26Al. The predicted 26Al is too...
Trautvetter, H. P., Bemmerer, D., Bonetti, R., Broggini, C., Caciolli, A., Confortola, F., ...
We report on a new measurement of $^{14}$N(p,$\gamma$)$^{15}$O for the ground state capture transition at $E_p$ = 360, 380 and 400 keV, using the 400 kV LUNA accelerator. The true coincidence summing...
Gyurky, Gy., Bemmerer, D., Confortola, F., Costantini, H., Formicola, A., Bonetti, R., ...
Recently, the LUNA collaboration has carried out a high precision measurement on the 3He(alpha,gamma)7Be reaction cross section with both activation and on-line gamma-detection methods at...
Molecular opacities for low-mass metal-poor AGB stars undergoing the Third Dredge Up (2007)
Cristallo, S., Straniero, O., Lederer, M. T., Aringer, B.
The concomitant overabundances of C, N and s-process elements are commonly ascribed to the complex interplay of nucleosynthesis, mixing and mass loss taking place in Asymptotic Giant Branch stars. At...
Confortola, F., Bemmerer, D., Costantini, H., Formicola, A., Gyürky, Gy., Bezzon, P., ...
Solar neutrino fluxes depend both on astrophysical and on nuclear physics inputs, namely on the cross sections of the reactions responsible for neutrino production inside the Solar core. While the...
White Dwarf cooling Sequences, II: luminosity functions (2007)
Moroni, P. G. Prada, Straniero, O.
Given the importance of white dwarfs (WDs) in many fields of modern astrophysics, the precise knowledge of the actual degree of accuracy of the associated theoretical predictions is a primary task....
3He(alpha,gamma)7Be cross section at low energies (2007)
Gyurky, Gy., Confortola, F., Costantini, H., Formicola, A., Bemmerer, D., Bonetti, R., ...
The flux of 7Be and 8B neutrinos from the Sun and the production of 7Li via primordial nucleosynthesis depend on the rate of the 3He(alpha,gamma)7Be reaction. In extension of a previous study showing...
A Method to Derive the Absolute Composition of the Sun, the Solar System and the Stars (2006)
Piersanti, L., Straniero, O., Cristallo, S.
The knowledge of isotopic and elemental abundances of the pristine solar system material provides a fundamental test of galactic chemical evolution models, while the composition of the solar...
Deep FORS1 observations of the double Main Sequence of omega Centauri (2006)
Sollima, A., Ferraro, F. R., Bellazzini, M., Origlia, L., Straniero, O., Pancino, E.
We present the results of a deep photometric survey performed with FORS1@VLT aimed at investigating the complex Main Sequence structure of the stellar system omega Centauri. We confirm the presence...
Activation measurement of the 3He(alpha,gamma)7Be cross section at low energy (2006)
Bemmerer, D., Confortola, F., Costantini, H., Formicola, A., Gyurky, Gy., Bonetti, R., ...
The nuclear physics input from the 3He(alpha,gamma)7Be cross section is a major uncertainty in the fluxes of 7Be and 8B neutrinos from the Sun predicted by solar models and in the 7Li abundance...
Extreme Type IIp Supernovae as Yardsticks for Cosmology (2006)
P. Höflich, O. Straniero, M. Limongi, I. Dominguez, A. Chieffi
Extreme Type IIp Supernovae as Yardsticks for Cosmology
Short-lived isotopes and 23Na production in low mass AGB Stars (2006)
Cristallo, S., Gallino, R., Straniero, O., Piersanti, L., Dominguez, I.
We discuss the synthesis of some short-lived isotopes and of 23Na in thermally pulsing AGB stars with initial mass of 2 Msun and two different metallicities (Z=1.5e-2, corresponding to the metal...
First measurement of the 14N(p,gamma)15O cross section down to 70 keV (2006)
Lemut, A., Bemmerer, D., Confortola, F., Bonetti, R., Broggini, C., Corvisiero, P., ...
In stars with temperatures above 20*10^6 K, hydrogen burning is dominated by the CNO cycle. Its rate is determined by the slowest process, the 14N(p,gamma)15O reaction. Deep underground in Italy's...
An empirical calibration of the mixing-length parameter alpha (2006)
Ferraro, F. R., Valenti, E., Straniero, O., Origlia, L.
We present an empirical calibration of the Mixing-Length free parameter ${\alpha}$ based on a homogeneous Infrared database of 28 Galactic globular clusters spanning a wide metallicity range (-2.15$
De Laverny, P., Abia, C., Dominguez, I., Plez, B., Straniero, O., Wahlin, R., ...
We present the first results of our ongoing chemical study of carbon stars in the Local Group of galaxies. We used spectra obtained with UVES at the 8.2 m Kueyen-VLT telescope and a new grid of...
De Laverny, P., Abia, C., Dominguez, I., Plez, B., Straniero, O., Wahlin, R., ...
We present the first results of our ongoing chemical study of carbon stars in the Local Group of galaxies. We used spectra obtained with UVES at the 8.2 m Kueyen-VLT telescope and a new grid of...
De Laverny, P., Abia, C., Dominguez, I., Plez, B., Straniero, O., Wahlin, R., ...
We present the first results of our ongoing chemical study of carbon stars in the Local Group of galaxies. We used spectra obtained with UVES at the 8.2 m Kueyen-VLT telescope and a new grid of...
De Laverny, P., Abia, C., Dominguez, I., Plez, B., Straniero, O., Wahlin, R., ...
We present the first results of our ongoing chemical study of carbon stars in the Local Group of galaxies. We used spectra obtained with UVES at the 8.2 m Kueyen-VLT telescope and a new grid of...
De Laverny, P., Abia, C., Dominguez, I., Plez, B., Straniero, O., Wahlin, R., ...
We present the first results of our ongoing chemical study of carbon stars in the Local Group of galaxies. We used spectra obtained with UVES at the 8.2 m Kueyen-VLT telescope and a new grid of...
Metallicities, relative ages and kinematics of stellar populations in omega Centauri (2005)
Sollima, A., Pancino, E., Ferraro, F. R., Bellazzini, M., Straniero, O., Pasquini, L.
We present results of an extensive spectroscopic survey of Subgiant stars in the stellar system omega Centauri. Using infrared CaII triplet lines, we derived metallicities and radial velocities for...
S-factor of 14N(p,gamma)15O at astrophysical energies (2005)
Imbriani, G., Costantini, H., Formicola, A., Vomiero, A., Angulo, C., Bemmerer, D., ...
The astrophysical S-factor of 14N(p,gamma)15O has been measured for effective center-of-mass energies between E_eff = 119 and 367 keV at the LUNA facility using TiN solid targets and Ge detectors....
Bemmerer, D., Confortola, F., Lemut, A., Bonetti, R., Broggini, C., Corvisiero, P., ...
The LUNA (Laboratory Underground for Nuclear Astrophysics) facility has been designed to study nuclear reactions of astrophysical interest. It is located deep underground in the Gran Sasso National...
Oxygen, magnesium and chromium isotopic ratios of presolar spinel grains (2005)
Zinner, E., Nittler, L. R., Hoppe, P., Gallino, R., Straniero, O., Alexander, C. M. O.
Dominguez, I., Abia, C., Straniero, O., Cristallo, S., Pavlenko, Ya. V.
We present a spectroscopic study of D461, a giant star belonging to Draco dwarf spheroidal galaxy. From spectral synthesis in LTE we derive a lithium abundance of log e(Li)=3.5+/-0.4 and a C/O ratio...
128Xe and 130Xe: Testing He-shell burning in AGB stars (2004)
Reifarth, R., Kaeppeler, F., Voss, F., Wisshak, K., Gallino, R., Pignatari, M., ...
The s-process branching at 128I has been investigated on the basis of new, precise experimental (n,g) cross sections for the s-only isotopes 128Xe and 130Xe. This branching is unique, since it is...
The bottleneck of the CNO burning and the age of the Globular Clusters (2004)
Imbriani, G., Costantini, H., Formicola, A., Bemmerer, D., Bonetti, R., Broggini, C., ...
The transition between the Main Sequence and the Red Giant Branch in low mass stars is powered by the onset of the CNO burning, whose bottleneck is the $^{14}$N(p,$\gamma)^{15}$O. The LUNA...
Discovery of an anomalous Sub Giant Branch in the Color Magnitude Diagram of omega Centauri (2004)
Ferraro, F. R., Sollima, A., Pancino, E., Bellazzini, M., Straniero, O., Origlia, L., ...
Using deep high-resolution multi-band images taken with the Very Large Telescope and the Hubble Space Telescope, we discovered a new anomalous sequence in the Color Magnitude Diagram of omega Cen....
Aluminium-26 in submicrometer-sized presolar SiC grains (2004)
Hoppe, P., Marhas, K. K., Gallino, R., Straniero, O., Amari, S., Lewis, R. S.
Evolution and nucleosynthesis of primordial low mass stars (2003)
Picardi, I., Chieffi, A., Limongi, M., Pisanti, O., Miele, G., Mangano, G., ...
We discuss in detail the evolutionary properties of low mass stars M< 1 M(Solar) having metallicity lower than Z=10^(-6) from the pre- main sequence up to (almost) the end of the Asymptotic Giant...
De Marchi, G., Paresce, F., Straniero, O., Moroni, P. G. Prada
Very deep images of the Galactic globular cluster M4 (NGC 6121) through the F606W and F814W filters were taken in 2001 with the WFPC2 on board the HST. A first published analysis of this data set...
Theoretical Light Curves of Type II-P SNe and Applications to Cosmology (2003)
Chieffi, A., Dominguez, I., Hoeflich, P., Limongi, M., Straniero, O.
Based on an extensive grid of stellar models between 13 and 25 Mo and a wide range of metallicities, we have studied the light curves of core collapse supernovae, their application to cosmology and...
The Chemical Composition of Carbon C(N) stars (2003)
Abia, C., Dominguez, I., Gallino, R., Masera, S., Busso, M., Straniero, O., ...
A chemical study of normal Galactic C(N) carbon stars is presented. Abundances of Li, CNO isotopes and s-elements are derived. The derived abundances of s-elements nicely agree with theoretical...
Minute steps on the quest of the s-process (2003)
Gallino, R., Arnone, E., Cristallo, S., Masera, S., Travaglio, C., Lambert, D. L., ...
Calibration of White Dwarf cooling sequences: theoretical uncertainty (2002)
Moroni, P. G. Prada, Straniero, O.
White Dwarf luminosities are powerful age indicators, whose calibration should be based on reliable models. We discuss the uncertainty of some chemical and physical parameters and their influence on...
s-Process Nucleosynthesis in Carbon Stars (2002)
Abia, C., Dominguez, I., Gallino, R., Busso, M., Masera, S., Straniero, O., ...
We present the first detailed and homogeneous analysis of the s-element content in Galactic carbon stars of N-type. Abundances of Sr,Y, Zr (low-mass s-elements, or ls) and of Ba, La, Nd, Sm and Ce...
The lithium content of the globular cluster NGC 6397 (2002)
Bonifacio, P., Pasquini, L., Spite, F., Bragaglia, A., Carretta, E., Castellani, V., ...
We make use of high resolution, high signal-to-noise ratio spectra of 12 turn-off stars in the metal-poor globular cluster NGC 6397 to measure its lithium content. We conclude that they all have the...
An s-Process origin of >180TA >m (2002)
Wisshak, K., Voss, F., Arlandini, C., Becái, F., Gallino, R., Heil, F., ...
RevMexAA (Serie de Conferencias), 10, 157-162 (2001) (2001)
O. Straniero, M. Limongi, I. Dominguez
Evolutionary eects with redshift of core collapse supernovae and their application to cosmology have been studied based on an extensive grid of stellar models between 13 and 25 M , and their light...
RevMexAA (Serie de Conferencias), 10, 157--162 (2001) (2001)
P. Hoflich, O. Straniero, M. Limongi, I. Dominguez
Evolutionary e#ects with redshift of core collapse supernovae and their application to cosmology have been studied based on an extensive grid of stellar models between 13 and 25 M# , and their light...
The Kr85 s-process Branching and the Mass of Carbon Stars (2001)
Abia, C., Busso, M., Gallino, R., Dominguez, I., Straniero, O., Isern, J.
We present new spectroscopic observations for a sample of C(N)-type red giants. These objects belong to the class of Asymptotic Giant Branch stars, experiencing thermal instabilities in the...
Abia, C., Dominguez, I., Straniero, O., Limongi, M., Chieffi, A., Isern, J.
Motivated by the recent detection of metals in different components of the high redshift universe and by the abundance ratios measured in the extremely metal-poor stars of our Galaxy, we study the...
Constraints on the Progenitors of SNeIa & Implications for the Cosmological Equation of State (2001)
Dominguez, I., Hoeflich, P., Straniero, O.
Detailed calculations for the stellar evolution, explosion and light curves have been performed to quantify the influence of the main sequence mass M(MS) and the metallicity of the progenitor on the...
Extreme type iip supernovae as yardsticks for cosmology (2001)
Chieffi , A., Dominguez , I., Höflich , P., Limongi , M., Straniero , O.
The O-Na and Mg-Al Anticorrelations in Turn-Off and early Subgiants in Globular Clusters (2000)
Gratton, R. G., Bonifacio, P., Bragaglia, A., Carretta, E., Castellani, V., Centurion, M., ...
High dispersion spectra (R>40,000) for a quite large number of stars at the main sequence turn-off and at the base of the subgiant branch in NGC6397 and NGC6752 were obtained with the UVES on Kueyen...
Extreme Type IIp Supernovae as Yardsticks for Cosmology (2000)
Höflich, P., Straniero, O., Limongi, M., Dominguez, I., Chieffi, A.
Evolutionary effects with redshift of core collapse supernovae and their application to cosmology have been studied based on an extensive grid of stellar models between 13 and 25 Mo, and their light...
Limongi, M., Straniero, O., Chieffi, A.
We present the evolutionary properties of a set of massive stellar models (namely 13, 15, 20 and 25 $\rm M_\odot$) from the main sequence phase up to the onset of the iron core collapse. All these...
Do zero metal intermediate mass stars experience thermal pulses? (1999)
Dominguez, I., Straniero, O., Limongi, M., Chieffi, A.
We have studied the evolution of intermediate mass (M.ge.5Mo) zero metal (Z=0) stars with particular attention to the AGB phase. At variance with previous claims we find that these stars experience...
Thermally Pulsing AGB Models of Intermediate Mass Stars (1999)
Straniero, O., Limongi, M., Chieffi, A., Dominguez, I., Busso, M., Gallino, R.
We present a set of models of AGB stars with initial mass larger than 5 Mo as obtained with the FRANEC code. It includes models of Z=0.02 and Z=0.001, with and without mass loss.
Arlandini, C., Kaeppeler, F., Wisshak, K., Gallino, R., Lugaro, M., Busso, M., ...
The recently improved information on the stellar (n,gamma) cross sections of neutron-magic nuclei at N = 82, and in particular of 142Nd, turned out to represent a sensitive test for models of...
Ferraro, F. R., Messineo, M., Pecci, F. Fusi, De Palo, M. A., Straniero, O., Chieffi, A., ...
A catalog including a set of the most recent Color Magnitude Diagrams (CMDs) is presented for a sample of 61 Galactic Globular Clusters (GGCs). We used this data-base to perform an homogeneous...
The Luminosity Function of M3 (1999)
Rood, R. T., Carretta, E., Paltrinieri, B., Ferraro, F. R., Pecci, F. Fusi, Dorman, B., ...
We present a high precision, large sample luminosity function (LF) for the Galactic globular cluster M3. With a combination of ground based and Hubble Space Telescope data we cover the entire radial...
Galactic chemical evolution of heavy elements: from Barium to Europium (1999)
Travaglio, C., Galli, D., Gallino, R., Busso, M., Ferrini, F., Straniero, O.
We follow the chemical evolution of the Galaxy for elements from Ba to Eu, using an evolutionary model suitable to reproduce a large set of Galactic (local and non local) and extragalactic...
s-process nucleosynthesis of 142^Nd: crisis of the classical model (1998)
Arlandini, C., Kaeppeler, F., Wisshak, K., Gallino, R., Lugaro, M., Busso, M., ...
The recently improved information on the stellar neutron capture cross sections of neutron magic nuclei at N = 82, and in particular for 142^Nd, turned out to represent a sensitive test for models of...
Galactic chemical evolution of Ba-peak elements (1998)
Travaglio, C., Galli, D., Gallino, R., Busso, M., Ferrini, F., Straniero, O.
The chemical evolution of the Galaxy is followed for the elements affected by neutron capture, in particular for those in the atomic number range 56 to 63 (Ba, La, Ce, Pr, Nd, Sm and Eu). Neutrons by...
The fate of Li and Be in stars and in the laboratory (1995)
Castellani, V., Fiorentini, G., Straniero, O., Ricci, B.
We connect the observed under-abundances of Li and Be in dwarfs, with recent results on nuclear cross sections at low energies: for collisions of protons with atomic or molecular targets, the...