Spectral classifications in the near infrared of stars with composite spectra - III. Study of a sample of 137 objects with the Aurelie spectrograph

We provide spectral classifications for a sample of 137 stars mentioned as having composite spectra. The classifications were carried out on 33 Angstr om/mm spectra in the region 8370 - 8870 Angstrom. Of these 137 objects, 115 correspond in the infrared to cool stars (G, K or M) of luminosity classes III, II and I; for 22 stars, we find only hot spectra of types B, A, F or Am, so that they do not fulfil our definition of composite spectra. We dete ct four new Am stars, and one Am star (HD 70826) turns out to be a composit e spectrum object. As in Paper II, the cool components of composite spectra show a strong conc entration in the vicinity of G8III.