Astron. Astrophys. Suppl. Ser.
Volume 136, Number 3, May I 1999
|Page(s)||429 - 444|
|Published online||15 May 1999|
Laboratoire d'Astrophysique de l'Observatoire de Grenoble, BP. 53, F–38 041 Grenoble Cedex, France
Send offprint request to: P. Corporon
Accepted: 17 November 1998
We present the results of a spectroscopic survey of binaries among 42 bright () Herbig Ae/Be stars in both hemispheres. Radial velocity variations were found in 7 targets, 4 are new spectroscopic binaries. The LiI 6 708 Å absorption line (absent feature in simple HAeBe stars spectra) indicates the presence of a cooler companion in 6 HAeBe spectrum binaries, 4 of which are new detections. Few stars classified as possible Herbig Ae/Be stars are not confirmed as such. While for short-period ( days) spectroscopic binaries, the observed binary frequency is 10%, the true spectroscopic binary frequency for Herbig Ae/Be stars may be as high as 35%.
Key words: binaries: spectroscopic / stars: early-type / stars: pre-Main Sequence / stars: statistics
Based on observations collected at the European Southern Observatory (ESO), La Silla, Chile and at the Observatoire de Haute–Provence (OHP), Saint–Michel l'Observatoire, France.
Table 1 only available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsweb.u-strasbg.fr/Abstract.html
© European Southern Observatory (ESO), 1999