Issue |
A&A
Volume 441, Number 2, October II 2005
|
|
---|---|---|
Page(s) | 533 - 548 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20052905 | |
Published online | 19 September 2005 |
Sulphur abundance in Galactic stars
1
Liceo L. e S.P.P. S. Pietro al Natisone, annesso al Convitto Nazionale “Paolo Diacono”, Piazzale Chiarottini 8, Cividale del Friuli (Udine), Italy e-mail: elcaffau@yahoo.it
2
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy e-mail: bonifaci@ts.astro.it
3
Dipartimento di Astronomia, Università degli Studi di Trieste Trieste, via Tiepolo 11, 34131 Trieste, Italy e-mail: faraggiana@ts.astro.it
4
Observatoire de Paris, 64 Avenue de l'Observatoire, 75014 Paris, France
5
Istituto Nazionale di Astrofisica – Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
Received:
18
February
2005
Accepted:
20
May
2005
We investigate sulphur abundance in 74 Galactic stars
by using high resolution spectra obtained at ESO VLT and NTT telescopes. For the first time the abundances are derived,
where possible,
from three optical multiplets: Mult. 1, 6, and 8.
By combining our own measurements with data in the
literature we assemble a
sample of 253 stars in the metallicity range
.
Two important features, which could hardly be
detected in smaller samples, are obvious
from this large sample: 1) a sizeable
scatter in [S/Fe] ratios around [Fe/H]
) at low metallicities
we observe stars with [S/Fe]
,
as well as stars with higher [S/Fe] ratios. The latter
do not seem to be kinematically
different from the former ones.
Whether the latter finding stems from a
distinct population of metal-poor stars or simply from
an increased scatter in sulphur abundances remains an open
question.
Key words: stars: abundances / stars: population II / stars: kinematics / stars: atmospheres / Galaxy: halo / Galaxy: evolution
© ESO, 2005
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