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D. Massa (Raytheon STX), E. L. Fitzpatrick (Villanova University)
While the low dispersion IUE NEWSIPS data products represent a significant improvement over original IUE SIPS data, they still contain serious systematic effects which compromise their utility for certain applications. We show that NEWSIPS low resolution data contain systematic effects of 10-15% due to residual temporal and THDA dependencies. In addition, the NEWSIPS flux calibration is shown to be inconsistent by nearly 10%.
We formulate and apply algorithms to correct the systematics to the 3% level -- a factor of 5 improvement. We also derive a transformation between the corrected IUE data and the HST FOS system -- placing the data from both telescopes onto a single system.
Finally, we demonstrate that the remaining 3% systematics in the corrected data are traceable to problems with the NEWSIPS intensity transfer function (ITF).