![Loading...](https://link.springer.com/static/c4a417b97a76cc2980e3c25e2271af3129e08bbe/images/pdf-preview/spacer.gif)
-
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...
-
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...
-
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...
-
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...
-
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...
-
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×...
-
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 ...
-
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)...
-
Chapter and Conference Paper
Spectroscopic variability associated with chromospheric activity: The α CEN system