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Astron. Astrophys. Suppl. Ser.
Volume 137, Number 3, June II 1999
Page(s) 521 - 528
DOI: 10.1051/aas:1999490

Astron. Astrophys. Suppl. Ser. 137, 521-528

High resolution spectroscopy over $\lambda\lambda$ 8500-8750 Å for GAIA

I. Mapping the MKK classification system[*][*][*]

U. Munari1,2 - L. Tomasella3

Send offprint request: U. Munari

1 - Osservatorio Astronomico di Padova, Sede di Asiago, I-36012 Asiago (VI), Italy
2 - Centro Interpardimentale Studi ed Attività Spaziali (CISAS "G. Colombo"), Università di Padova, Italy
3 - Osservatorio Astrofisico dell' Università di Padova, I-36012 Asiago (VI), Italy

Received March 29; accepted April 16, 1999


We present an Echelle+CCD high resolution spectroscopic atlas (0.25 Å/pix dispersion, 0.43 Å FWHM resolution and 20 000 resolving power) mapping the MKK classification system over the interval $\lambda\lambda$ 8500-8750 Å. The wavelength interval is remarkably free from telluric lines and it is centered on the near-IR triplet of Ca II, the head of hydrogen Paschen series and several strong metallic lines. The spectra of 131 stars of types between O4 and M8 and luminosity classes I through V are included in the atlas. Special care was put in maintaining the highest instrumental homogeneity over the whole set of data. The capability to derive accurate MKK spectral types from high resolution observations over the interval $\lambda\lambda$ 8500-8750 Å is discussed. The observations have been performed as part of an evaluation study of possible spectroscopic performances for the astrometric mission GAIA planned by ESA.

Key words: Atlases -- standards -- stars: fundamental parameters

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