The STARTYPE group led by S.D. Price at the Air Force Research Laboratory has found spurious features present in their SWS observations of early type stars. Two broad and prominent features (~ 5%) occur between 4 and 6 µm and 7 and 12 µm. Analysis has shown that at least part of these features can be explained by sytematic errors in the calibration caused by deficiencies in the synthetic spectra used for the RSRF and absolute flux calibration. All SWS spectra produced from Off Line Reprocessing OLP 10 are affected by this calibration problem. The OLP 10 products have been publicly available since June 8th of 2001 but available in the SWS Interactive Analysis software since November 2000.

Thanks to the input of the STARTYPE group and the ISO Data Center (IDC), the SWS team was able to correct the problem and include the correction in the final ISO archive. The IDC is currently reprocessing the SWS database in a new version of the Off-Line Reprocessing, OLP10.1. We encourage all users of OLP 10 products to review the reprocessing note available at the IDC and assess the impact on their data. The release of this note is accompanied by the release of OLP10.1, so that, if necessary, corrected data may be obtained from the ISO Data Archive.

Abstract