Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multicolour CCD Measurements of Visual Double and Multiple Stars. III   Recent CCD observations were performed in the period 1998-2004 for a large
sample of visual double and multiple stars selected from the Hipparcos
Catalogue and/or from the Gliese Catalogue of Nearby Stars. Accurate
astrometric and photometric data allowing to characterize the individual
components are provided. These data are confronted to Hipparcos data or to data
from an older epoch in order to assess the nature of the observed systems. We
simultaneously apply a Moffat-Lorentz profile with a similar shape to all
detected components and adjust the profile parameters from which we obtain the
relative astrometric position (epoch, position angle, angular separation) as
well as differential multi-colour photometry (filters (B)VRI). We thus acquired
recent data for 71 visual systems of which 6 are orbital binaries, 27 are
nearby and 30 are multiple systems. In three cases, the systems remained
unresolved. 23 new components were detected and measured. Two new visual double
stars of intermediate separation were also found. The estimated accuracies in
relative position are 0.04 deg and 0.01" respectively, while those in
differential photometry are of the order of 0.01-0.02 mag in general. The
nature of the association of 55 systems is evaluated. New basic binary
properties are derived for 20 bound systems. Component colours and masses are
provided for two orbital binaries.

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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn