Astron. Astrophys. Suppl. Ser.
Volume 123, Number 1, May II 1997
|Page(s)||135 - 146|
|Published online||15 May 1997|
II. Study of a sample of 180 stars
Observatoire Midi-Pyrénées, UMR No. 5572 (CNRS), 14 Avenue Edouard Belin, 31400 Toulouse, France
2 Observatoire de Strasbourg, URA 1280 (CNRS), 11 Rue de l'Université, 67000 Strasbourg, France
Send offprint request to: J.M. Carquillat
Accepted: 12 September 1996
A sample of 180 supposedly composite-spectrum stars has been studied on the basis of spectra obtained in the near infrared (8370-8780 Å) at a dispersion of 33 Å/mm. The objective was to study the cooler components of the systems. Of our sample, 120 are true composite spectra, 35 are hot spectra of types B, F and 25 are Am stars. We find a strong concentration of the cooler components of the composite spectra around G8III. In view of the difficulty of classifying composite spectra, because of the superposition of an early type dwarf and a late type giant or supergiant spectrum, we have made several tests to control the classification based upon the infrared region. Since all tests gave positive results, we conclude that our classifications can be considered as being both reliable and homogeneous.
Key words: stars: classification / infrared: stars / binaries: spectroscopic
Table 1 is also available electronically at the CDS via anonymous ftp 22.214.171.124 or http://cdsweb.u-strasbg.fr/Abstracts.html
© European Southern Observatory (ESO), 1997