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Astron. Astrophys. 322, 202-208 (1997)

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New binary stars discovered by lunar occultations. III *

A. Richichi 1, G. Calamai 1, Ch. Leinert 2 and B. Stecklum 3

1 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
2 Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
3 Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

Received 9 May 1996 / Accepted 12 November 1996


We report on a total of 20 occultation events of 16 binary sources, observed in the near infrared in the course of routine lunar occultation programs at the TIRGO and Calar Alto observatories. The results consist in either discoveries of new binaries, or in re-observations of known or suspected binaries where only incomplete information was available. This paper is the third in a series of similar reports (see Richichi et al.  1994 and 1996, hereafter Papers I and II).

For the following 9 stars, we detected a companion for the first time: SAO 160179, DO 10593, DO 11286, SAO 96515, SAO 96547, SAO 164323, SAO 164360, SAO 164371, SAO 128391. Of these, SAO 96515 was a suspected lunar occultation binary, while SAO 160179 and SAO 96547 (as well as SAO 146402 below) belong also to wider binary pairs. For the following 4 stars, we confirm previous reports of binarity: SAO 161153, SAO 95419, SAO 146402, SAO 96810; for these stars, our IR measurements complement existing visual information: Finally, in the case of the three stars SAO 93777, SAO 162050 and SAO 95456, a companion had also been previously observed or suspected, but we could not detect it. Our negative detection in these cases provides a constraint on the characteristics of the companion. The projected separations in our positive results cover a range of two orders of magnitude, from [FORMULA] [FORMULA] to [FORMULA] [FORMULA].

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.

Send offprint requests to: A. Richichi (arichichi@arcetri.astro.it)

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998