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Astron. Astrophys. Suppl. Ser. 141, 141-148
High resolution spectroscopy over 8500-8750 Å for
GAIA,,
II. A library of synthetic spectra for
7500 K
U. Munari1,2 -
F. Castelli3
Send offprint request: U. Munari, e-mail: munari@pd.astro.it
1 - Osservatorio Astronomico di Padova, Sede di Asiago, I-36012 Asiago (VI), Italy
2 -
Centro Interpardimentale Studi ed Attività Spaziali (CISAS "G. Colombo"), Università di
Padova, Italy
3 -
CNR-GNA-Osservatorio Astronomico di Trieste Via Tiepolo 11, I-34131 Trieste, Italy
Received September 9; accepted October 4, 1999
Abstract:
We present a library of synthetic spectra characterized by
,
and
K computed at the same
= 20000
resolving power of the observed spectra given in Paper I for 131 standard
stars mapping the MKK spectral classification system. This range of
parameters includes the majority of the galactic stars expected to dominate
the GAIA target population, i.e. F-G-K-M type stars with metallicity ranging
from that of the galactic globular clusters to Population I objects.
Extension to
> 7500 K will be given later on in this series.
The 254 synthetic spectra presented here are based on Kurucz's codes and
line data and have been computed over a more extended wavelength interval
(7650-8750 Å) than that currently baselined for implementation on GAIA,
i.e. the 8500-8750 Å. This last range is dominated by the near-IR Ca II
triplet and the head of the Paschen series. The more extended wavelength
range allows us to investigate the behaviour of other strong near-IR
spectral features (severely contaminated by telluric absorptions in
ground-based observed spectra) as the K I doublet (7664, 7699 Å), the Na I
doublet (8183, 8194 Å) and the lines of Fe I multiplet N.60 at 8327 and
8388 Å. The synthetic spectra support our previous conclusions about the
superior performance of the Paschen/Ca II 8500-8750 Å region in meeting
the GAIA requirements when compared to other near-IR intervals of similar
= 250 Å.
Key words: atlases -- surveys -- stars: fundamental parameters
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