The scientific potential of the post-helium database

Details The scientific potential of the post-helium database The scientific potential of the post-helium database

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.511...87v&link_type=abstract

Exploiting the ISO Data Archive. Infrared Astronomy in the Internet Age, held in Siguenza, Spain 24-27 June, 2002. Edited by

Astronomy and Astrophysics

Astronomy

1

Scientific paper

After the depletion of the liquid Helium used for the cooling of the telescope and the focal plane instruments of ISO, the temperature of the focal plane remained sufficiently low to operate the InSb band 1 detectors of the SWS. Observing time was granted to a programme aimed at extending the MK-classification to the near-infrared. Good quality spectra (2.36μm - 4.1μm) of 238 stars at moderate resolution (λ/δ λ ≈ 1500 - 2000) were obtained in the time slots available during the satellite engineering test programme.
Low scheduling priority was given to the programme stars that were already observed at a similar resolution during the nominal part of the mission in the framework of various other programmes. The dataset has been completed with these 55 nominal-phase spectra. The resulting data-set, the ISO-SWS post-helium atlas of near-infrared stellar spectra, contains 293 spectra covering a large range of spectral types and luminosity classes. The calibrated and reduced data is now available electronically.
We illustrate the potential of this database for near-infrared classification of stars, stellar population synthesis and the reduction of ground-based L-band spectra. We also show the first results of our application of Autoclass, an unsupervised Bayesian classification, on the Post-He data and suggest other AUTOCLASS applications on the ISO archive.

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