2003A&A...400..695D


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.14CET15:28:57

2003A&A...400..695D - Astronomy and Astrophysics, volume 400, 695-707 (2003/3-3)

ISO-SWS calibration and the accurate modelling of cool-star atmospheres. III. A0 to G2 stars.

DECIN L., VANDENBUSSCHE B., WAELKENS C., ERIKSSON K., GUSTAFSSON B., PLEZ B. and SAUVAL A.J.

Abstract (from CDS):

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. (2003A&A...400..679D), each of these stars is discussed individually in this paper. As demonstrated in Decin et al. (2003A&A...400..679D), 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 (θd) 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 θd=3.35±0.20mas, R=2.79±0.17R, Mg=2.54±1.21M and L=61±9L; for Sirius θd=6.17±0.38mas, R=1.75±0.11R, Mg=2.22±1.06M and L=29±6L; for β Leo θd=1.47±0.09mas, R=1.75±0.11R, Mg=1.78±0.46M and L=15±2L; for α Car θd=7.22±0.42mas, R=74.39±5.76R, Mg=12.80+24.95–6.35M and L=14573±2268L and for α Cen A θd=8.80 ±0.51mas, R=1.27±0.08R, Mg=1.35±0.22M and L=1.7±0.2L. 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.

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Journal keyword(s): infrared: stars - stars: atmospheres - stars: fundamental parameters

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 414 0
2 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1377 0
3 * bet Leo dS* 11 49 03.57834 +14 34 19.4090 2.30 2.22 2.13 2.08 2.06 A3Va 535 0
4 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1111 0
5 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2476 0

    Equat.    Gal    SGal    Ecl

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2019.12.14-15:28:57

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