Issue |
A&A
Volume 410, Number 2, November I 2003
|
|
---|---|---|
Page(s) | 511 - 518 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20031112 | |
Published online | 17 November 2003 |
Analysing the database for stars in open clusters
I. General methods and description of the data
1
Institut d'Astronomie de l'Université de Lausanne, 1290 Chavannes-des-Bois, Switzerland
2
Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
3
Zentraler Informatikdienst der Universität Wien, Universitätsstr. 7, 1010 Wien, Austria
Corresponding author: E. Paunzen, ernst.paunzen@univie.ac.at
Received:
7
May
2003
Accepted:
25
June
2003
We present an overview and statistical analysis of the data
included in WEBDA. This database includes valuable information such as coordinates,
rectangular positions, proper motions, photometric as well as spectroscopic data, radial and
rotational velocities for objects of open clusters in our Milky Way. It also contains
miscellaneous types of data like
membership probabilities, orbital elements of spectroscopic binaries and periods of
variability for different kinds of variable stars. Our final goal is to derive
astrophysical parameters (reddening, distance and age) of open clusters
based on the major photometric system which will be presented in a follow-up paper.
For this purpose
we have chosen the Johnson UBV, Cousins VRI and Strömgren
photometric systems for a statistical analysis of published data sets included
in WEBDA. Our final list contains photographic, photoelectric and
CCD data for 469 820 objects in 573 open clusters.
We have checked the internal (data sets within one photometric system and the same
detector technique) and external (different detector technique) accuracy and conclude
that more than 97% of all investigated data exhibit a sufficient accuracy for our
analysis. The way of weighting and averaging the data is described. In addition,
we have compiled a list of deviating measurements which is available to the
community through WEBDA.
Key words: open clusters and associations: general / catalogs
© ESO, 2003
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