Trapezium Multiple Systems (Salukvadze, 1978) - The Catalogue of
Trapezium Multiple Systems
I/134/data ivo://CDS/VizieR/I/134/data VizieR Salukvadze G.N.Francois Ochsenbein [CDS]1997-12-0911-Feb-1997CDS support team
CDS, Observatoire de Strasbourg, 11 rue de l'Universite,
F-67000 Strasbourg, France
question@simbad.u-strasbg.frMultiple_Stars
The present catalogue of Trapezium-type Multiple Systems was
compiled on the basis of the Index Catalogue of Visual Binary
Stars (IDS, Jeffers et al., 1963). At the period of compilation
of the Abastumani catalogue, IDS was the most complete catalogue
concerning not only stars, but also the data on double
stars. Besides giving relative positions, IDS presents the
coordinates at 1900 and 2000 epochs, as well as in most cases
magnitudes, spectral classes and proper motions. IDS contains
all double and multiple stars from the North to the South poles
with relative positions published up to the end of 1960, their
total number being 64247. In order to select optimum value of K
(ratio of the largest to the smallest distances among the
components), which is the main criterion for relating a multiple
star to the trapezium type, the dependence of the observed
trapezia number on the K value has been analysed, and the value
2.6 adopted for it. To exclude optical components, upper limits
for the distances of faint components to the main star have been
introduced, and the components fainter than 12.5mag were
excluded altogether (Salukvadze, 1978). The catalogue of
Trapezium-type Multiple Systems contains 412 trapezia, for
which, after examining all main spectral catalogues (Jaschek et
al., 1964; Kennedy et al., 1974; Houck et al., 1975;
Cruz-Gonzales et al., 1974; Lindsey et al., 1968), spectral
classes in the MK system have been specified. This was done for
100 systems, including 65 stars of O and B spectral classes. The
following data on trapezia are given in the catalogue:
positional angles and distances, magnitudes and spectral classes
according to HD as well as MK, the ADS and BD identification
number of the main star. On the basis of the probability,
deduced by Ambartsumian (1954), the number of pseudo-trapezia
was estimated, that is, the number of multiple stars, which in
fact have no trapezium-type configurations, but are observed as
trapezia as a result of their projection on the celestial
sphere. The number of estimated pseudo-trapezia is 167. It
should be mentioned that among 59 trapezia, the main components
of which are of the O-B2 spectral class, there are only 5
pseudo-trapezia. This enables us to maintain that there is a
considerable percent of real trapezia among the ones of
mentioned spectral classes. Evaluation of the number of optical
systems, formed as a result of the appearance of background
stars in circles, which are determined by the upper limits of
components' distances, led to their insignificant number 9.
http://vizier.u-strasbg.fr/cgi-bin/Cat?I/134/data
CatalogResearchpublictext/xml+votabletext/plain+csvOptical
I/134/dataThe Catalogue of Trapezium Multiple Systemsrecno
Record number within the original table (starting from 1)
RECORDMainFlag
[*] The asterisk indicates the main star of a trapezium system
REMARKSSeqOrdinal numberID_MAINIDS
Designation in "Index Catalogue of Visual Double Stars"
(based on B1900 position)
ID_ALTERNATIVECompDesignation of componentsID_ALTERNATIVEtheta
[0/360] Positional angle of a component relative to the main star
degPOS_POS-ANGrhoDistance of a component to the main stararcsecORBIT_SEPARATIONVmag1? Magnitude of the main star (1)magPHOT_MAG_UNDEFVmag2? Magnitudes of trapezium componentmagPHOT_JHN_VSp1IDS Spectral class of the main star (1)SPECT_TYPE_GENERALSpType1
Spectral class of the main star in the MK system (1)
SPECT_TYPE_GENERALADS? ADS number (1)ID_ALTERNATIVEDMDurchmusterung number (1)ID_ALTERNATIVE