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  1. No Access

    Article

    On the Nature of Damped LYα Systems: Clues from Determinations of Elemental Abundance Ratios

    We present a study of the [α/Fe-peak] and [N/α] abundance ratios in Damped Lyα (DLA) systems. By using ratios of undepleted elements ([S/Zn] and [N/S]) or when abundances of refractory elements are corrected b...

    M. Centurión, P. Bonifacio, P. Molaro, G. Vladilo in Astrophysics and Space Science (1998)

  2. No Access

    Chapter and Conference Paper

    Neutral Nitrogen in Damped Lyman a Systems

    Nitrogen abundance determinations in high-redshift galaxies are an important tool for understanding the first stages of galactic chemical evolution. The most intense NI lines, i.e. the triplets at rest wavelen...

    G. Vladilo, P. Molaro, F. Matteucci, M. Centurión in The Early Universe with the VLT (1997)

  3. No Access

    Chapter and Conference Paper

    As Metal Poor as It Could Be: the Damped System at z=3.390 Towards QSO 0000-2619

    We present an abundance analysis of the damped Lya system seen in the spectrum of the QSO 0000-2619 at z abs=3.390. From the analysis of high resolution spectra (FWHM ⋍ 11 and 14 km s−1) w...

    G Vladilo, S. D’Odorico, P. Molaro, S. Savaglio in QSO Absorption Lines (1995)

  4. No Access

    Article

    The local interstellar medium: A test-bed for the galactic ISM

    We outline a method to explore the column density of the Local Interstellar Medium (LISM) using absorptions in the resonance H and K lines of Mgii. The intrinsic strengths of these lines in the temperature and de...

    R. Génova, J. E. Beckman, G. Vladilo, P. Molaro in Astrophysics and Space Science (1989)

  5. No Access

    Article

    Physical parameters of reflection nebulae in the galaxy

    We show how, given observed equivalent widths of Mgii and Mgi absorptions due to an interstellar cloud in which a late-B star is embedded, the basic physical parameters: kinetic temperature, mean density, electro...

    M. Centurión, G. Vladilo in Astrophysics and Space Science (1989)

  6. No Access

    Article

    Some considerations on the non-detection of interstellar Li and B towards the SN1987a

    A very low upper limit of 0.15 mÅ for the interstellar λ6707 Å Lii line has been recently derived towards the SN1987a by Baade and Magain (1988). This value corresponds toN(Li)<1.4×1011 cm−2 and gives [Li/H]<5.4×...

    P. Molaro, G. Vladilo in Astrophysics and Space Science (1989)

  7. No Access

    Chapter and Conference Paper

    High-velocity absorption components toward the LMC

    High-resolution (λ/δλ ≅ 6 × 104) spectra of R136 (the central object of 30 Dor) and of 2 LMC supergiants obtained at ESO with the 1.4-m telescope have been analysed in order to study the high-velocity absorption ...

    G. Vladilo, P. Molaro, S. Monai… in Structure and Dynamics of the Interstellar… (1989)

  8. No Access

    Chapter and Conference Paper

    High resolution profiles of the CA II infrared triplet lines in late-type active and quiescent dwarfs

    In the framework of a long term programme of chromospheric modelling of late-type dwarfs, high resolution high signal-to-noise spectral profiles of the 8498 and 8542 A lines of the Ca II infrared triplet (IRT)...

    B. H. Foing, L. Crivellari, J. E. Beckman… in Cool Stars, Stellar Systems, and the Sun (1987)

  9. No Access

    Chapter and Conference Paper

    Spectroscopic variability associated with chromospheric activity: The α CEN system

    B. Foing, J. Beckman, L. Crivellari, G. Vladilo… in Cool Stars, Stellar Systems, and the Sun (1986)