EDP Sciences
Free Access
Volume 437, Number 2, July II 2005
Page(s) 611 - 626
Section Stellar structure and evolution
DOI https://doi.org/10.1051/0004-6361:20042107
Published online 21 June 2005

A&A 437, 611-626 (2005)
DOI: 10.1051/0004-6361:20042107

A multiplicity survey of the $\rho$ Ophiuchi molecular clouds

T. Ratzka1, R. Köhler1, 2 and Ch. Leinert1

1  Max-Planck-Institute for Astronomy (MPIA), Königstuhl 17, 69117 Heidelberg, Germany
    e-mail: ratzka@mpia.de
2  Sterrewacht Leiden, Niels Bohrweg 2, 2300 RA Leiden, The Netherlands

(Received 1 October 2004 / Accepted 22 March 2005)

We present a volume-limited multiplicity survey with magnitude cutoff ( ${m}_{K}\leq 10.5\mathrm{\ mag}$) of 158 young stellar objects located within or in the vicinity of the $\rho$ Ophiuchi Dark Cloud. With exception of eleven already well observed objects, all sources have been observed by us in the K-band with 3.5 m telescopes by using speckle techniques. The separation range covered by our survey is $0.13''\leq\theta\leq 6.4''$, where the lower limit is given by the diffraction limit of the telescopes and the upper limit by confusion with background stars. The multiplicity survey is complete for flux ratios $\geq $0.1 ( $\Delta{m}_{K}\leq 2.5$) at the diffraction limit. After taking the background density into account the degree of multiplicity is $29.1\%\pm 4.3\%$ and thus only marginally higher than the value $23.5\%\pm 4.8 \%$ derived for the given separation range for the main-sequence solar-like stars in the solar neighbourhood (Duquennoy & Mayor 1991). We discuss the implications of these findings.

Key words: stars: pre-main-sequence -- binaries: visual -- infrared: stars -- surveys -- techniques: interferometric

SIMBAD Objects

© ESO 2005

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.