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Titolo:
An astrophysical oscillator strength for the SII 94.7-nm resonance line and S abundances in DLAs
Autore:
Bonifacio, P; Caffau, E; Centurion, M; Molaro, P; Vladilo, G;
Indirizzi:
Osserv Astron Trieste, I-34131 Trieste, Italy Osserv Astron Trieste Trieste Italy I-34131 este, I-34131 Trieste, Italy Convitto Nazl Paolo Diacono, Ist Magistrale SPP&L Annesso, S Pietro Natisone Udine, Italy Convitto Nazl Paolo Diacono S Pietro Natisone Udine Italy Udine, Italy
Titolo Testata:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
fascicolo: 2, volume: 325, anno: 2001,
pagine: 767 - 771
SICI:
0035-8711(20010801)325:2<767:AAOSFT>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LYMAN-ALPHA SYSTEMS; MOLECULAR-HYDROGEN; HD-93521; GALAXIES; ORFEUS; STAR;
Keywords:
atomic data; stars : individual : HD 93521; ISM : abundances; quasars : absorption lines; quasars : individual : QSO 0347-3819; quasars : individual : BR; J0307-4945;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Bonifacio, P Osserv Astron Trieste, Via GB Tiepolo 11, I-34131 Trieste, Italy Osserv Astron Trieste Via GB Tiepolo 11 Trieste Italy I-34131
Citazione:
P. Bonifacio et al., "An astrophysical oscillator strength for the SII 94.7-nm resonance line and S abundances in DLAs", M NOT R AST, 325(2), 2001, pp. 767-771

Abstract

By using UV spectra for the O star HD 93521 taken with the ORFEUS II echelle spectrograph, we determine an 'astrophysical' f value for the S II lambda 94.7-nm line: f = 0.00498(-0.00138)(+0.00172,) error at 1 sigma- level. This is almost a factor of 30 smaller than the guessed value found in the Kurucz data base (f = 0.1472), which was until now the only one available forthis transition. We use our 'astrophysical' f to investigate the S abundance in two damped Ly alpha absorption systems (DLAs) observed with the UV-Visual Echelle Spectrograph (UVES) at the European Southern Observatory's 8.2-m Kueyen telescope. In the case of the absorber at Z(abs) = 3.02486 towards QSO 0347-3819, we find a sulphur column density which is consistent, within errors, with that determined by Centurion et al. by means of the lambda 125.9-nm line, thus providing an external check on the accuracy of our f value. For the damped absorber at Z(abs) = 4.4680 towards BR J0307-4945, we determine a high value of the S abundance, which, however, is probably the result of blending with Ly alpha forest lines.

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Documento generato il 19/09/20 alle ore 14:57:06