Astron. Astrophys. 361, 594-600 (2000)

New binary stars discovered by lunar occultations. V ^*

A. Richichi ^{**  1}, S. Ragland ², G. Calamai ³, S. Richter ⁴ and B. Stecklum <sup>4

1</sup> European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching bei München, Germany
² Observatoire de la Côte d'Azur, Départment Fresnel, 2130 Route de l'Observatoire, 06460 Caussols, France
³ Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
⁴ Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany

Received 25 May 2000 / Accepted 14 July 2000

Abstract

We present recent results from our ongoing lunar occultation program on binary stars at the TIRGO and Calar Alto observatories. Observations are presented here for a total of seventeen sources, the majority of which are resolved for the first time. These include SAO 94621, IRAS 18154-1900, SAO 98345, SAO 98363, SAO 93947, SAO 97319, SAO 97437, SAO 94986, SAO 94488, DO 11742, SAO 78027 and SAO 79799. Two speckle binaries were also observed, namely SAO 98427 and SAO 110723; this latter is discovered to be a quadruple system. SAO 77810 is found to be a new triple system. In the cases of SAO 94621 and SAO 98363, we have recorded two occultation light curves each, at different position angles: this allowed us to derive actual position angles and separations for these binary systems. We report an observation of the occultation binary SAO 94961, for which we could not detect the companion. Finally, we report also an observation of the well-studied multiple system SAO 97645 ( Cnc), which is discussed in detail in a separate paper.

Key words: occultations stars: binaries: close stars: binaries: spectroscopic stars: binaries: visual astrometry

* Based on observations collected at TIRGO (Gornergrat, Switzerland), and at Calar Alto (Spain). TIRGO is operated by CNR-CAISMI Arcetri, Italy. Calar Alto is operated by the German-Spanish Astronomical Center.
** On leave from Osservatorio Astrofisico di Arcetri

Send offprint requests to: A. Richichi (arichich@eso.org)

SIMBAD Objects

Contents

• 1. Introduction
• 2. Stars with positive binary detection
  • 2.1. SAO 94621
  • 2.2. SAO 97645
  • 2.3. SAO 98363
  • 2.4. SAO 98427
  • 2.5. SAO 110723
  • 2.6. SAO 94986
  • 2.7. SAO 94488
  • 2.8. SAO 77810
  • 2.9. Remaining stars
• 3. Stars with negative binary detection
• 4. Statistical considerations in connection with long-baseline interferometry
• 5. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: October 2, 2000
helpdesk@link.springer.de