The INES System IV: The IUE Absolute Flux Scale

Abstract

This paper deals with the definition of the input fluxes used for the calibration of the IUE Final Archive. The method adopted consists on the determination of the shape of the detector's sensitivity curves using IUE low resolution observations with model fluxes of the DA white dwarf G191-B2B. A scale factor was then determined so that the IUE observations of some bright OAO-2 standards match the original measurements from Meade (1978) in the spectral region 2100-2300 A. The ultraviolet fluxes of six standard stars used as input for the Final Archive photometric calibration together with the model fluxes of G191-B2B normalized to the OAO-2 scale are given. A comparison with the independent FOS calibration shows that the IUE flux scale for the Ultraviolet is 7.2% lower. We consider this mainly to be caused by the different normalization procedures. It is shown that the present flux calibration applies to spectra processed with the INES low resolution extraction software.

17 pages, 8 figures. To appear in Astronomy and Astrophysics

References in corpus (1)

• The INES System II: Ripple Correction and Absolute Calibration for IUE High Resolution Spectra

Cited by in corpus (14)

• UVBLUE: a new high-resolution theoretical library of ultraviolet stellar spectra
• The GJ 504 system revisited. Combining interferometric, radial velocity, and high contrast imaging data
• A study of the expanding envelope of Nova V1974 Cyg 1992 based on IUE high resolution spectroscopy
• Metallicities of the beta Cephei stars from low-resolution ultraviolet spectra
• Synthetic Mid-UV Spectroscopic Indices of Stars
• The He II Fowler lines and the O III and N III Bowen fluorescence lines in the symbiotic nova RR Tel
• The fundamental parameters of the roAp star $\gamma$ Equulei
• Young LMC clusters: the role of red supergiants and multiple stellar populations in their integrated light and CMDs
• The secrets of T Pyx: I. UV observations
• A Study of the Near-Ultraviolet Spectrum of Vega
• The Active Quiescence of HR Del (Nova Del 1967)
• The magnetic future of the Sun
• A study of the Mg II 2796.34 A emission line in late--type normal, and RS CVn stars
• Spectrophotometric variability of the magnetic CP star 56 Arietis in spectral region from 1950 to 3200 A