Spectral classifications in the near infrared of stars with composite spectra. II. Study of a sample of 180 stars

Details Spectral classifications in the near infrared of stars with composite spectra. II. Study of a sample of 180 stars Spectral classifications in the near infrared of stars with composite spectra. II. Study of a sample of 180 stars

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..123..135g&link_type=abstract

A & A Supplement series, Vol. 123, May II 1997, 135-146.

Astronomy and Astrophysics

Astronomy

32

Stars: Classification, Infrared: Stars, Binaries: Spectroscopic

Scientific paper

A sample of 180 supposedly composite-spectrum stars has been studied on the basis of spectra obtained in the near infrared (8370-8780 Angstroms) at a dispersion of 33 Anstroms/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 super position 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. Table \ref{tab1} is also available electronically at the CDS via anonymous ftp 130.79.128.5 or http://cdsweb.u-strasbg.fr/Abstracts.html} Based upon observations carried out at Observatoire de Haute-Provence (CNRS).

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