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I/134 Trapezium Multiple Systems (Salukvadze, 1978)
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A New List of Trapezium-Type Multiple Systems
Salukvadze G.N.
<Byull. Abastumani Astrofiz. Obs. No. 49, pp. 39-68 (1978)>
=1978AbaOB..49...39S
The Catalogue of Trapezium-Type Multiple Systems
Salukvadze G.N.
<Astrofizika 14, 57 (1978)>
=1978Afz....14...57S
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ADC_Keywords: Stars, double and multiple
Introduction:
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.dat 71 1012 The Catalogue of Trapezium Multiple Systems
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See also:
I/237 : The Washington Visual Double Star Catalog
(Continuation of the IDS)
Byte-by-byte Description of file: data.dat
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Bytes Format Units Label Explanations
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1 A1 --- MainFlag [*] The asterisk indicates the main star
of a trapezium system
2- 4 I3 --- Seq Ordinal number
6- 15 A10 --- IDS Designation in "Index Catalogue of Visual
Double Stars" (based on B1900 position)
17- 20 A4 --- Comp Designation of components
22- 24 I3 deg theta [0/360] Positional angle of a component
relative to the main star
26- 29 F4.1 arcsec rho Distance of a component to the main star
31- 34 F4.1 mag Vmag1 ? Magnitude of the main star (1)
36- 39 F4.1 mag Vmag2 ? Magnitudes of trapezium component
41- 43 A3 --- Sp1 IDS Spectral class of the main star (1)
45- 55 A11 --- SpType1 Spectral class of the main star in the
MK system (1)
57- 61 I5 --- ADS ? ADS number (1)
63- 71 A9 --- DM Durchmusterung number (1)
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Note (1): information only provided to the first pair of the system
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Acknowledgements:
The author is thankful to professor V.A.Ambartsumian for valuable
advices during the compilation of the catalogue of trapezium-type
multiple systems, and also to the collaborators of the Abastumani
Astrophysical Observatory M.Butikashvili and N.Kiselyova for the
transfer of the trapezia catalogue on the magnetic tape.
Author's address:
G.N.Salukvadze
Astrophysical Observatory
383762 Abastumani, Georgia
References:
Ambartsumian, V.A.: Com. Byurakan Obs., 13, 1-35 (1954)
Cruz-Gonzales, C., Recillas-Cruz, E., Castero, R., Peimbert, M.,
Torres-Peinbert, S., Rev.Mex.Astron.Astrophys., 1, 2, 211-259 (1974)
Houck, N., Cowley, A.P.: University of Michigan Catalogue of
Two-Dimensional Spectral Types for the HD stars, Michigan
V.1 (-90 deg. to -53 deg.) (1975) (Catalog <III/31>)
Jaschek, C., Conde, H., Sierra, A.C.: Catalogue of stellar spectra
classified in the Morgan-Keenan system. Observatorio Astronomico de
la Universidad National de La Plata, Serie Astronomica 28, 2 (1964)
(Catalog <III/18>)
Jeffers, H.M., van den Boss, W.H., Creeby, F.M.: Index Catalogue
of visual Double Stars, Publ.Lick Obs. 21 (1963)
Kennedy, P.M., Buscombe, W.: MK Spectral Classifications published
since Jaschek's La Plata Catalogue (1974) (see catalog <III/78>)
Lindsey, F.S.: M.N.R.A.S. 138, 1, 109-121 (1968)
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(End) Francois Ochsenbein [CDS] 11-Feb-1997