EDP Sciences
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Volume 382, Number 1, January IV 2002
Page(s) 178 - 183
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20011589

A&A 382, 178-183 (2002)
DOI: 10.1051/0004-6361:20011589

New binary stars discovered by lunar occultations. VI.

A. Richichi1, G. Calamai2 and B. Stecklum3

1  European Southern Observatory, Karl-Schwarzschildstr. 2, 85748 Garching bei München, Germany
2  Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 5, 50125 Firenze, Italy
3  Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany

(Received 12 September 2001 / Accepted 8 November 2001)

We present additional results from our ongoing lunar occultation program. Observations are presented here for a total of seventeen sources, for the majority of which one or two new companions are detected. The sample comprises mostly field stars, spanning a large range of spectral types. Two infrared objects without optical counterpart are also included. The range of projected separations is $0\farcs007$ to $0\farcs162$. We report on the following binary stars: IRAS 16576-2116 , IRAS 19495-1628 , IRAS 18033-1955 , CGCS 3964 , SAO 94064 , EI Tau , SAO 93950 , SAO 79217 , SAO 79285 and SAO 80075 . We found HD 247924 and SAO 139322 to be triple systems. In the case of SAO 93950 , the revised analysis of two occultation events has provided the true position angle and separation of this system. We also observed the young T Tauri star GG Tau A , where we detected a significant orbital motion with respect to the latest available measurements. In two cases, SAO 79285 and SAO 139322 , a companion was already claimed on the basis of Hipparcos results, but our observations are not entirely consistent with these latter. Finally, our sample includes four stars known to be binary, namely SAO 186497 , SAO 162183 , SAO 96753 and SAO 161192 , for which we did not detect a companion. Among these, our negative detection of the companion of SAO 162183 poses strong constraints on the parameters of this presumed binary.

Key words: astrometry -- occultations -- binaries: close -- binaries: spectroscopic -- binaries: visual -- stars: individual: GG Tau A

Offprint request: A. Richichi, arichich@eso.org

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