Astron. Astrophys. 346, 501-504 (1999)

Discovery of a close companion to the young star Haro 6-37 ^*

A. Richichi ¹, R. Köhler ², J. Woitas ³ and Ch. Leinert <sup>3

1</sup> Osservatorio Astrofisico di Arcetri, L.go Enrico Fermi 5, I-50125 Firenze, Italy
² Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
³ Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany

Received 9 December 1998 / Accepted 22 January 1999

Abstract

We report lunar occultation (LO) and speckle interferometry observations of Haro 6-37, all carried out at =m. The main finding is the discovery of a new close companion by LO, subsequently confirmed by speckle. The two techniques yield values in excellent agreement, with and for the separation and position angle respectively. Additionally, the LO data show evidence of what might be interpreted as scattered light from the inner part of the dust disk which is known to exist around Haro 6-37 from mm-radio observations (Osterloh & Beckwith 1995). However this last conclusion is subject to some uncertainty because of possible contamination of the signal during data acquisition. LO and speckle results are in good agreement also for what concerns the brightness ratio of the newly found companion to the main component, R=0.10 or K=2.5. We discuss the possible implications on the general picture of Haro 6-37, in particular for what concerns the ages of the components and the dust disk.

Key words: infrared: stars stars: pre-main sequence stars: individual: Haro 6-37 stars: binaries: close occultations techniques: interferometric

* Based on observations collected at the Calar Alto Observatory (Spain), operated by the German-Spanish Astronomical Center.

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

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Contents

• 1. Introduction
• 2. Observations
• 3. Results and discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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