Portal de Periódicos da CAPES

ISO-SWS calibration and the accurate modelling of cool-star atmospheres

2003; EDP Sciences; Volume: 400; Issue: 2 Linguagem: Inglês

10.1051/0004-6361

1432-0746

L. Decin, B. Vandenbussche, C. Waelkens, Kimmo Eriksson, B. Gustafsson, B. Plez, A. J. Sauval,

Astrophysics and Star Formation Studies

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.