Artifacts at 4.5 and 8.0 um in Short Wavelength Spectra from the Infrared Space Observatory

Details Artifacts at 4.5 and 8.0 um in Short Wavelength Spectra from the Infrared Space Observatory Artifacts at 4.5 and 8.0 um in Short Wavelength Spectra from the Infrared Space Observatory

2001-12-19

arxiv.org/abs/astro-ph/0112447v1

565: L55-L58, 2002 January 20

Astronomy and Astrophysics

Astrophysics

14 pages, AASTex, including 5 figures. Accepted by ApJ Letters

Scientific paper

10.1086/339055

Spectra from the Short Wavelength Spectrometer (SWS) on ISO exhibit artifacts at 4.5 and 8 um. These artifacts appear in spectra from a recent data release, OLP 10.0, as spurious broad emission features in the spectra of stars earlier than ~F0, such as alpha CMa. Comparison of absolutely calibrated spectra of standard stars to corresponding spectra from the SWS reveals that these artifacts result from an underestimation of the strength of the CO and SiO molecular bands in the spectra of sources used as calibrators by the SWS. Although OLP 10.0 was intended to be the final data release, these findings have led to an additional release addressing this issue, OLP 10.1, which corrects the artifacts.

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