Centurión, Miriam, Molaro, Paolo, Levshakov, Sergei
Laser Comb Wavelength calibration shows that the ThAr one is locally unreliable with possible deviations of up to 100 m/s within one order range, while delivering an overall 1 m/s accuracy (Wilken et...
The mystery of the telescopes in Jan Brueghel the Elder's paintings (2009)
Molaro, Paolo, Selvelli, Pierluigi
Several early spyglasses are depicted in five paintings by Jan Brueghel the Elder completed between 1608 and 1625, as he was court painter of Archduke Albert VII of Habsburg. An optical tube that...
On the telescopes in the paintings of J. Brueghel the Elder (2009)
Selvelli, Pierluigi, Molaro, Paolo
We have investigated the nature and the origin of the telescopes depicted in three paintings of J. Bruegel the Elder completed between 1609 and 1618. The "tube" that appears in the painting dated...
Stringent bounds to spatial variations of the electron-to-proton mass ratio in the Milky Way (2009)
Molaro, Paolo, Levshakov, Sergei A., Kozlov, MiKhail G.
The ammonia method to probe variations of the electron-to-proton mass ratio, Delta_mu/mu, is applied for the first time to dense prestellar molecular clouds in the Milky Way. Carefully selected...
Cosmic dynamics in the era of Extremely Large Telescopes (2008)
Liske, Jochen, Grazian, Andrea, Vanzella, Eros, Dessauges, Miroslava, Viel, Matteo, Pasquini, Luca, ...
The redshifts of all cosmologically distant sources are expected to experience a small, systematic drift as a function of time due to the evolution of the Universe's expansion rate. A measurement of...
Cosmic dynamics in the era of Extremely Large Telescopes (2008)
Liske, Jochen, Grazian, Andrea, Vanzella, Eros, Dessauges, Miroslava, Viel, Matteo, Pasquini, Luca, ...
The redshifts of all cosmologically distant sources are expected to experience a small, systematic drift as a function of time due to the evolution of the Universe's expansion rate. A measurement of...
Cosmic dynamics in the era of Extremely Large Telescopes (2008)
Liske, Jochen, Grazian, Andrea, Vanzella, Eros, Dessauges, Miroslava, Viel, Matteo, Pasquini, Luca, ...
The redshifts of all cosmologically distant sources are expected to experience a small, systematic drift as a function of time due to the evolution of the Universe's expansion rate. A measurement of...
Cosmic dynamics in the era of Extremely Large Telescopes (2008)
Liske, Jochen, Grazian, Andrea, Vanzella, Eros, Dessauges, Miroslava, Viel, Matteo, Pasquini, Luca, ...
The redshifts of all cosmologically distant sources are expected to experience a small, systematic drift as a function of time due to the evolution of the Universe's expansion rate. A measurement of...
Bounds on the fine structure constant variability from FeII absorption lines in QSO spectra (2007)
Molaro, Paolo, Reimers, Dieter, Agafonova, Irina I., Levshakov, Sergei A.
The Single Ion Differential alpha Measurement (SIDAM) method for measuring fine stucture variations (daa)and its figures of merit are illustrated together with the results produced by means of FeII...
Science with a 16m VLT: the case for variability of fundamental constan ts (2007)
Only astronomical observations can effectively probe in space-time the variabil ity of the physical dimensionless constants such as the fine structure constant and proton-to-electron mass ratio, \mu,...
THE ASTROPHYSICAL JOURNAL, 565 696719, 2002 February 1 (2007)
The American Astronomical, Sergei A. Levshakov, Miroslava Dessauges-zavadsky, Sandro Dodorico, Paolo Molaro
We have detected in high-resolution spectra of the quasar Q0347[3819 obtained with the UV-Visual Echelle Spectrograph (UVES) at the VLT/Kueyen telescope over 80 absorption features in the Lyman and...
THE ASTROPHYSICAL JOURNAL, 549 9099, 2001 March 1 (2007)
The American Astronomical, Paolo Molaro, Sergei A. Levshakov, Sandro Dodorico, Piercarlo Bonifacio, Miriam Centurio N
The UV resonance transitions of neutral argon, Ar I j1066, and of singly ionized phosphorus, P II j963, originated in the damped Lya system (DLA) at toward QSO 0000[2620, have been z \ 3.3901...
Primordial Light Element Abundances (2007)
After few minutes the Universe evolved through conditions of temperature and density which permitted the first synthesis of astrophysically interesting abundances of D, 3He, 4He and 7Li. The relic...
Variations in the lithium abundances of turn off stars in the globular cluster 47 Tuc (2007)
Bonifacio, Piercarlo, Pasquini, Luca, Molaro, Paolo, Carretta, Eugenio, François, Patrick, Gratton, Raffaele G., ...
aims: Our aim is to determine Li abundances in TO stars of the Globular Cluster 47 Tuc and test theories about Li variations among TO stars. method: We make use of high resolution (R~ 43000), high...
Variations in the lithium abundances of turn off stars in the globular cluster 47 Tuc (2007)
Bonifacio, Piercarlo, Pasquini, Luca, Molaro, Paolo, Carretta, Eugenio, François, Patrick, G. Gratton, Raffaele, ...
aims: Our aim is to determine Li abundances in TO stars of the Globular Cluster 47 Tuc and test theories about Li variations among TO stars. method: We make use of high resolution (R~ 43000), high...
Variations in the lithium abundances of turn off stars in the globular cluster 47 Tuc (2007)
Bonifacio, Piercarlo, Pasquini, Luca, Molaro, Paolo, Carretta, Eugenio, François, Patrick, G. Gratton, Raffaele, ...
aims: Our aim is to determine Li abundances in TO stars of the Globular Cluster 47 Tuc and test theories about Li variations among TO stars. method: We make use of high resolution (R~ 43000), high...
The CODEX-ESPRESSO experiment: cosmic dynamics, fundamental physics, planets and much more (2007)
Cristiani, Stefano, Avila, Gerardo, Bonifacio, Piercarlo, Bouchy, Francois, Carswell, B., D'Odorico, Sandro D., ...
CODEX, a high-resolution, super-stable spectrograph to be fed by the E-ELT, the most powerful telescope ever conceived, will for the first time provide the possibility of directly measuring the...
The CODEX-ESPRESSO experiment: cosmic dynamics, fundamental physics, planets and much more (2007)
Cristiani, Stefano, Avila, Gerardo, Bonifacio, Piercarlo, Bouchy, Francois, Carswell, B., D'Odorico, Sandro D., ...
CODEX, a high-resolution, super-stable spectrograph to be fed by the E-ELT, the most powerful telescope ever conceived, will for the first time provide the possibility of directly measuring the...
High-Precision Measurements of Delta alpha/alpha from QSO Absorption Spectra (2006)
Levshakov, Sergei A., Molaro, Paolo, Lopez, Sebastian, D'Odorico, Sandro, Centurion, Miriam, Bonifacio, Piercarlo, ...
Precise radial velocity measurements (delta v/c ~ 10^{-7}) of FeII lines in damped Ly-alpha systems from very high quality VLT/UVES spectra of quasars HE0515-4414 and Q1101-264 are used to probe...
Exploring variations in the fundamental constants with ELTs: The CODEX spectrograph on OWL (2006)
Molaro, Paolo, Murphy, Michael T., Levshakov, Sergei, Di Trieste, Osservatorio Astronomico, ...
Cosmological variations in the fine structure constant, alpha, can be probed through precise velocity measurements of metallic absorption lines from intervening gas clouds seen in spectra of distant...
Chemical Abundances in the Secondary Star of the Neutron Star Binary Centaurus X-4 (2005)
Hernández, Jonay I. González, Rebolo, Rafael, Israelian, Garik, Casares, Jorge, Maeda, Keiichi, Bonifacio, Piercarlo, ...
Using a high resolution spectrum of the secondary star in the neutron star binary {Cen X-4}, we have derived the stellar parameters and veiling caused by the accretion disk in a consistent way. We...
Abundances in Damped Ly-alpha Galaxies (2005)
Damped Ly_alpha galaxies provide a sample of young galaxies where chemical abundances can be derived throughout the whole universe with an accuracy comparable to that for the local universe. Despite...
CODEX : measuring the expansion of the universe (2005)
Pasquini, Luca, Cristiani, Stefano, Dekker, Hans, Haehnelt, Martin, Molaro, Paolo, Pepe, Francesco, ...
CODEX, a high-resolution, super-stable spectrograph to be fed by OWL, the most powerful telescope ever conceived, will for the first time provide the possibility of directly measuring the change of...
CODEX : measuring the expansion of the universe (2005)
Pasquini, Luca, Cristiani, Stefano, Dekker, Hans, Haehnelt, Martin, Molaro, Paolo, Pepe, Francesco, ...
CODEX, a high-resolution, super-stable spectrograph to be fed by OWL, the most powerful telescope ever conceived, will for the first time provide the possibility of directly measuring the change of...
Exploring variations in the fundamental constants with ELTs: the CODEX spectrograph on OWL (2005)
Molaro, Paolo, Murphy, Michael T., Levshakov, Sergei A.
Cosmological variations in the fine structure constant, α, can be probed through precise velocity measurements of metallic absorption lines from intervening gas clouds seen in spectra of...
Exploring variations in the fundamental constants with ELTs: the CODEX spectrograph on OWL (2005)
Molaro, Paolo, Murphy, Michael T., Levshakov, Sergei A.
Cosmological variations in the fine structure constant, α, can be probed through precise velocity measurements of metallic absorption lines from intervening gas clouds seen in spectra of...
CODEX : measuring the expansion of the universe (2005)
Pasquini, Luca, Cristiani, Stefano, Dekker, Hans, Haehnelt, Martin, Molaro, Paolo, Pepe, Francesco, ...
CODEX, a high-resolution, super-stable spectrograph to be fed by OWL, the most powerful telescope ever conceived, will for the first time provide the possibility of directly measuring the change of...
Exploring variations in the fundamental constants with ELTs: the CODEX spectrograph on OWL (2005)
Molaro, Paolo, Murphy, Michael T., Levshakov, Sergei A.
Cosmological variations in the fine structure constant, α, can be probed through precise velocity measurements of metallic absorption lines from intervening gas clouds seen in spectra of...
D'Odorico, Valentina, Molaro, Paolo
The Damped Ly-alpha (DLA) absorber at redshift z_abs=4.383 observed toward QSO BRI 1202-0725 is studied by means of high resolution (FWHM ~ 7 km/s) VLT-UVES spectra. We refine a previously determined...
CNO abundances in the Damped Ly-alpha clouds (2003)
Damped Ly alpha clouds provide information on the chemistry of distant and metal poor regions of the universe. In these clouds for observational difficulties N and O are among the last elements to be...
Chemical Abundances in High-Redshift Neutral Clouds (2001)
Neutral hydrogen clouds with high column density detected towards distant quasars are unique probes of elemental nucleosynthesis and chemical evolution in the low metallicity regime. They provide...
A new deuterium abundance measurement from a damped Ly-alpha system at z_abs = 3.025 (2001)
D'Odorico, Sandro, Dessauges-Zavadsky, Miroslava, Molaro, Paolo
We present the first D/H measurement in a damped Ly-alpha system at z_abs = 3.025 towards QSO 0347-3819 obtained from the UVES-VLT spectra. The DLA absorber has a metallicity of [Zn/H] = -1.25 and a...
Molaro, Paolo, Levshakov, Sergei A., D'Odorico, Sandro, Bonifacio, Piercarlo, Centurion, Miriam
The UV resonance transitions of neutral argon ArI 1066 A, and of singly ionized phosphorus PII 963 A, originated in the damped Ly_alpha system (DLA) at zabs = 3.3901 towards QSO 0000--2620 have been...
First UVES observations of beryllium in very metal-poor stars (2000)
Primas, Francesca, Molaro, Paolo, Bonifacio, Piercarlo, Hill, Vanessa
We report on a attempt to detect beryllium in two dwarf stars of the Galactic halo with metallicities below one thousandth solar. The data were obtained during the Commissioning of the Ultraviolet...
Intrinsic colour calibration for F, G, K stars (2000)
Bonifacio, Piercarlo, Caffau, Elisabetta, Molaro, Paolo
We derive an intrinsic colour calibration for F--K stars using broad band Johnson colours and line indices KP and HP2. Through this calibration we can determine E(B-V) of an individual star within...
Zinc as a tracer of metallicity evolution of Damped Lyman alpha systems (2000)
Vladilo, Giovanni, Bonifacio, Piercarlo, Centurion, Miriam, Molaro, Paolo
Zinc is a good indicator of metallicity in Damped Lyman alpha (DLA) systems because it is almost unaffected by dust depletion. However, the use of zinc as a tracer of metallicity evolution has been...
First results of UVES at VLT: abundancesin the Sgr dSph (2000)
Bonifacio, Piercarlo, Hill, Vanessa, Molaro, Paolo, Pasquini, Luca, Di Marcantonio, Paolo, Santin, Paolo
Two giants of the Sagittarius dwarf spheroidal have been observed with the UVES spectrograph on the ESO 8.2m Kueyen telescope, during the commissioning of the instrument. Sgr 139 has [Fe/H]=-0.28 and...
Molaro, Paolo, Bonifacio, Piercarlo, Centurion, Miriam, D'Odorico, Sandro, Vladilo, Giovanni, Santin, Paolo, ...
Observations of the QSO 0000-2620 with UVES spectrograph at the 8.2m ESO KUEYEN telescope are used for abundance analysis of the damped Ly-alpha system at z_{abs}=3.3901. Several Oxygen lines are...
Chemical Evolution of Damped Ly alpha galaxies: The [S/Zn] abundance ratio at redshift z > 2 (2000)
Centurion, Miriam, Bonifacio, Piercarlo, Molaro, Paolo, Vladilo, Giovanni
Relative elemental abundances, and in particular the alpha/Fe ratio, are an important diagnostic tool of the chemical evolution of damped Ly alpha systems (DLAs). The S/Zn ratio is not affected by...
Low deuterium abundance in the zabs=3.514 absorber towards APM 08279+5255 (1999)
Molaro, Paolo, Bonifacio, Piercarlo, Centurion, Miriam, Vladilo, Giovanni
A high-resolution, high signal-to-noise HIRES-Keck spectrum of APM 08279+5255 reveals a feature in the HI Ly alpha profile of the zabs=3.514 absorber at the expected position of the corresponding DI...
The Galactic Lithium Evolution Revisited (1999)
Romano, Donatella, Matteucci, Francesca, Molaro, Paolo, Bonifacio, Piercarlo
Light and heavy elements in the galactic bulge (1999)
Matteucci, Francesca, Romano, Donatella, Molaro, Paolo
The chemical evolution of the Galactic bulge is treated here in the context of an inside-out model for the Galaxy formation. We assume that this central region evolved even faster than the Galactic...
Detection of the Li I 6104 Angstroem transition in the Population II star HD 140283 (1998)
Bonifacio, Piercarlo, Molaro, Paolo
Lithium is one of the few primordially produced elements. The value of the primordial Li is taken to be that observed in metal--poor dwarfs, where it is not contaminated by stellar Li sources which...
Chemical abundances in the young galaxy at z=2.309 towards PHL 957 (1997)
Molaro, Paolo, Centurion, Miriam, Vladilo, Giovanni
We present high-resolution UES spectra of the quasar PHL 957 obtained for studying the foreground Damped Ly-alpha galaxy at z=2.309. Measurements of absorption lines lead to accurate abundance...
Abundances of Big Bang elements (1997)
In this paper we review the present status of observations of the Big Bang elements D, 3He, 4He and 7Li and of their extrapolation to the primordial values. It is shown that, within the errors, the...
Lithium observations in 47 Tuc (1996)
We present high resolution observations (FWHM=15 km/sec) of the Li region in 5 stars belonging to the old (14 Gyrs), metal rich ([Fe/H]=-0.7) globular cluster 47Tuc. At the ESO NTT telescope we...
The primordial lithium abundance (1996)
Bonifacio, Piercarlo, Molaro, Paolo
Lithium abundances in a selected sample of halo stars have been revised by using the new accurate IRFM effective temperatures by Alonso, Arribas & Martinez-Roger (1996a). From 41 plateau stars (Teff...
Baryonic Density from Primordial Li (1996)
Bonifacio, Piercarlo, Molaro, Paolo
Lithium abundances in a selected sample of halo stars have been revised by using new accurate Teff. From 41 plateau stars we found no evidence for intrinsic dispersion, a tiny trend with Teff and no...
Abundances of four very metal-poor stars of the BPS survey (1994)
Primas, Francesca, Molaro, Paolo, Castelli, Fiorella
High resolution CASPEC and EMMI spectra (R$\approx$10$^4$) of the faint metal- deficient candidates CS 22891--209, CS 22897--8, CS 22948--66 and CS 22968--14 taken from the survey of Beers, Preston...