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Astron. Astrophys. 318, 472-484 (1997)


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Binaries among Herbig Ae/Be stars *

Christoph Leinert 1, Andrea Richichi 2 and Martin Haas 1

1 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
2 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy

Received 3 May 1996 / Accepted 22 July 1996

Abstract

We have studied the circumstellar environment of 31 Herbig Ae/Be and related stars in the near infrared by means of speckle-interferometry. For the brighter objects we reach or approximate diffraction-limited resolution of [FORMULA] [FORMULA] (typically 100 AU at the object). Of the resolved objects some show halos, some have a companion. Here we restrict ourselves to a discussion of binarity in this sample. Eleven objects have companions, five of which constitute subarcsecond binaries, mostly found by us. Although the sample is small and neither homogeneous nor complete, it indicates a similar high incidence of binaries as found in recent surveys among T Tauri stars. Where the data allow it, we discuss the nature of the companions.

Key words: stars: pre-main sequence – binaries:visual – stars: emission: Line, Be – infrared: stars – techniques: interferometric

* Based on observations collected at ESO, La Silla, and the german-spanish astronomical center Calar Alto

Send offprint requests to: Ch. Leinert e-mail: leinert@mpia-hd.mpg.de

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998

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