Astron. Astrophys. Suppl. Ser. 134, 473-482

Spectral classifications in the near infrared of stars with composite spectra

III. Study of a sample of 137 objects with the Aurelie spectrograph

N. Ginestet¹ - J.M. Carquillat¹ - C. Jaschek²

Send offprint request: J.M. Carquillat
e-mail: Carquila@obs-mip.fr

1 - Observatoire Midi-Pyrénées, UMR 5572 (CNRS), 14 avenue Edouard Belin, 31400 Toulouse, France
2 - Observatoire de Strasbourg, URA 1280 (CNRS), 11 rue de l'Université, 67000 Strasbourg, France

Received May 15; accepted July 3, 1998

Abstract:

We provide spectral classifications for a sample of 137 stars mentioned as having composite spectra. The classifications were carried out on 33 Å/mm spectra in the region $8370\, {-}\, 8870$ Å. 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 detect four new Am stars, and one Am star (HD 70826) turns out to be a composite spectrum object.

As in Paper II, the cool components of composite spectra show a strong concentration in the vicinity of G8III.

Key words: stars: fundamental parameters -- stars: infrared -- binaries: spectroscopic