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A&A Supplement series, Vol. 128, February II 1998, 207-219

Received January 13; accepted June 17, 1997

Infrared standards for ISO

I. A new calibration of mid infrared photometry

P.L. Hammersleytex2html_wrap1377, M. Jourdain de Muizontex2html_wrap1379gif, M.F. Kesslertex2html_wrap1381gif, P. Bouchettex2html_wrap1383, R.D. Josephtex2html_wrap1385, H.J. Habingtex2html_wrap1387, A. Salamatex2html_wrap1381gif, and L. Metcalfetex2html_wrap1391

Send offprint request: P.L. Hammersley

tex2html_wrap1393  Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
tex2html_wrap1395  DESPA, Observatoire de Paris, Meudon, France
tex2html_wrap1397  LAEFF, VILSPA, P.O. Box 50727, 28080 Madrid, Spain
tex2html_wrap1399  ESA, VILSPA, P.O. Box 50727, 28080 Madrid, Spain
tex2html_wrap1401  European Southern Observatory, Casilla 19001, Santiago 19, Chile
tex2html_wrap1403  IRTF, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI96822, U.S.A.
tex2html_wrap1405  Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands


We present N, 8.7 tex2html_wrap_inline1357m, 9.8 tex2html_wrap_inline1357m 12.5 tex2html_wrap_inline1357m and Q bolometry of 26 stars which were observed on the IRTF. These are primarily K giants which have been well measured at other wavelengths and are chosen to be single and non-variable. Hence the data presented provides a new homogeneous set of mid IR standards. As a test of part of the calibration strategy of ISO over this wavelength range, the zero points have been set using the Kurucz model grids (1993) to predict the mid IR magnitudes from near IR data. An analysis of the errors involved is presented and a comparison with more direct methods for the determination of the zero points suggest an possible error of 0.015 mags, although the source of this error is unclear as it is at the level of the uncertainty in the more direct methods. The effect of the SiO fundamental on the spectral energy distributions of K giants is discussed.

keywords: techniques: photometric -- stars: fundamental parameters -- infrared: stars

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