ISO-SWS calibration and the accurate modelling of cool-star atmospheres *,**
III. A0 to G2 stars
1
Instituut voor Sterrenkunde, KULeuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
2
Institute for Astronomy and Space Physics, Box 515, 75120 Uppsala, Sweden
3
GRAAL - CC72, Université de Montpellier II, 34095 Montpellier Cedex 5, France
4
Observatoire Royal de Belgique, Avenue Circulaire 3, 1180 Bruxelles, Belgium
Corresponding author: L. Decin, Leen.Decin@ster.kuleuven.ac.be
Received:
22
November
2001
Accepted:
2
December
2002
Vega, Sirius, β Leo, α Car and α Cen A
belong to a sample of twenty stellar sources used for the
calibration of the detectors of the Short-Wavelength Spectrometer on
board the Infrared Space Observatory (ISO-SWS). While general
problems with the calibration and with the theoretical modelling of
these stars are reported in Decin et al. ([CITE]), each of these stars
is discussed individually in this paper. As demonstrated in
Decin et al. ([CITE]), it is not possible to deduce the effective
temperature, the gravity and the chemical composition from the ISO-SWS
spectra of these stars. But since ISO-SWS is absolutely calibrated,
the angular diameter (
) of these stellar sources can be deduced from
their ISO-SWS spectra, which consequently yields the stellar radius (R),
the gravity-inferred mass (Mg) and the luminosity (L) for these
stars. For Vega, we obtained 
mas, 
, 
and 
;
for Sirius 
mas, 
, 
and 
;
for β Leo 
mas,
, 
and 
;
for α Car 
mas, 
, 
and 
and for α Cen A 
mas, 
, 
and 
.
These deduced parameters are confronted with other published values and the
goodness-of-fit between observed ISO-SWS data and the
corresponding synthetic spectrum is discussed.
Key words: infrared: stars / stars: atmospheres / stars: fundamental parameters
© ESO, 2003