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I/136       Trapezium-Type Multiple Sys in T Associations (Salukvadze 1980)
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Catalogue of Trapezium-Type Multiple Systems in T Associations
    Salukvadze G.N.
    <Astrofizika 16, 505-511 (1980)>
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ADC_Keywords: Associations, stellar ; Stars, double and multiple

Description:
   Because of the great importance of multiple and double Orion variable
   stars, in order to investigate some cosmogonical problems, a search for
   Trapezium-type multiple systems in T-associations from P.N.Kholopov's
   list (Kholopov, 1970). was carried out on the basis of the survey of
   Palomar maps. These include 13 associations (Aur T1, Cep T1, Cep T2, Oph
   T1, Sco T1, Ori T1, Ori T2, Ori T3, Ori T4, Tau T1, Tau T2, Tau T3, Tau
   T4), located at the distance of up to 500 pc. As generally accepted, the
   following types of irregular variable stars were considered to belong to
   T-associations. They are IA, INA, IN, INB, INT, UVN, INS, UV,
   INBS, INAS, INTS. From catalogues of variable stars all stars of the above
   mentioned types, belonging to the selected T-associations, were written
   out. Thus, for each association lists of stars were compiled to
   ascertain whether they belonged to the Trapezium-type systems or not.
   The total number of variable stars is 880, but among them the search was
   carried on around 670 stars.

   For the survey of Palomar maps a special microscope was constructed,
   equipped with a micrometer for measuring distances with the accuracy of
   up to 0.005 mm, and a screw, enabling the measurement of positional
   angles with an accuracy of up to 0.5 deg. This microscope is fixed on a
   special small table belonging to the stereometro- graph and can move in
   two directions, perpendicular to each other. The map was illuminated
   from above with the help of a special lamp from the stereometrograph's
   pack. On Palomar maps in both e and b colours in a radius of 1'of arc
   around each studied star, distances, positional angles and diameters
   were measured for all stars. The error of one determination of the
   components' distances to the main star is equal to plus/minus 0.5
   arcsec. and the error of one determination a positional angle for
   distances up to 10 sec. was equal to plus/minus 2deg.; for the greater
   distances equal to plus/minus 1 deg.

   In order to derive magnitudes of stars of the selected associations
   (except Ori T2), measured on both Palomar atlas maps, the relation
   between images' diameters and magnitudes, presented in Dorschner's work
   (Dorschner, 1966), was used. The authors evaluate mean error of one
   determination as plus/minus 0.5 magnitudes. For the derivation of
   magnitudes of Ori T2 stars, measured on the meniscus telescope plates
   and Palomar atlas maps, standard stars from Andrews' work (Andrews,
   1970) were used. Thus, magnitudes for Ori T2 stars were determined with
   the accuracy of plus/minus 0.2 mag.

   After measuring relative positions and determining magnitudes,
   components, for which distance to the main star exceeds some limit,
   determined by Aitken's formula were ignored in order to exclude optical
   systems. The maximum distance accepted for the components of 15th
   magnitude in the Johnson and Morgan, V system was equal to 60 sec., and
   for the components of the 20th magnitude equal to 6 sec.

   The following data on the Trapezia are given in the catalogue: the name
   of the main star and data on it; right ascension and declination for
   the year 1900, magnitude, spectral class and type of irregular variable
   star; positional angles and components' distances relative to the main
   star, magnitudes and colour indices, spectral classes and the type of
   irregular variable stars of the Trapezia components. In the notes
   identification of the main star as well as of the Trapezia components is
   given.

File Summary:
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ReadMe             80        .   This file
doc_01             80      121   Intro
doc_02             80       30   format
data_01.dat        97      283   data
data_02.dat        80      159   rmks
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(End)                                 Gail L. Schneider [SSDOO/ADC]  25-Sep-1995