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I/211        CCDM (Components of Double and Multiple stars) (Dommanget+ 1994)

Catalogue of the Components of Double, Multiple stars (CCDM) first edition Dommanget J., Nys O. <Comm. Obs. R. Belgique, Ser. A, N. 115 (1994)> =1994CoORB.115....1D
ADC_Keywords: Stars, double and multiple Description: The introduction to this catalogue has been the subject of a publication in the "Communications de l'Observatoire Royal de Belgique" (Serie A, number 115). Detailed are: its origins, its aims, its realization, the search of identifiers, the compilation of astrometric data and the related problems as well as the fundamental ties between the CCDM and the HIPPARCOS INPUT CATALOGUE (HIC). It also contains a complete bibliography of the referred papers. The contents of the general catalogue (63,463 systems) is also described as well as the conditions of its availability to the astronomical community and the projects underway for the next edition. For all these items, the user is invited to refer to this publication because hereafter only the format and the contents of the catalogue follow. To identify the systems and their components, we adopted the clever numbering process of the authors of the INDEX consisting in combining the right ascension and declination, respectively limited to 0.1 minute of time and to 1 minute of arc. In order to distinguish the CCDM numbers from the INDEX numbers - in addition to their different equinox: 2000 for the CCDM and 1900 for the INDEX - we adopted the signs + and - instead of the letters N and S for separating the coordinates. Consequently, in the INDEX and in the CCDM, one entry is devoted to a same system but the contrary to the INDEX, where a sub-entry is assigned to each group of two components, whatever the multiplicity of the system may be, the CCDM allows one sub-entry and thus one record per component. The present edition contains only the 34,031 systems (table below, part I) for which an accurate position has been found for at least one component. The catalogue extends thus much over the sample of the somewhat 14,000 systems finally retained for the HIPPARCOS INPUT CATALOGUE and assembled in its Annex 1. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ccdm.doc 110 460 Documentation catalog.dat 132 74861 The Catalogue
See also: I/196 : Hipparcos Input Catalogue (Turon+ 1993) I/260 : CCDM Stars in Hipparcos Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
2- 11 A10 --- CCDM (Catalogue of the Components of the Double and Multiple stars) number (1) 12 A1 --- rComp *[B-Z?] Reference component (blank if A) 13 A1 --- Comp *[A-Z?] Concerned component 14 A1 --- Note1 [*] *=orbit in Dommanget's personal cat. (2) 15 A1 --- Note2 [@] @ = astrometric binary 16- 22 A7 --- Disc Name of the pair (Discoverer and Number) 24- 30 F7.2 s dRAs ? Remainder of RA in second of time; 31- 37 F7.1 arcsec dDEs ? Remainder of DE in arcsecond; 39- 40 I2 --- r_dRAs ? Source code for positions (3) 42- 45 I4 yr Year ? Year of measured relative position 47- 49 A3 deg theta Position angle (degrees) (4) 50- 55 F6.1 arcsec rho ? angular separation of Comp along theta 57- 58 I2 --- Obs ? for A component: number of components; other component: number of measurements 60- 63 F4.1 mag Vmag ? magnitude 65- 66 A2 --- Sp spectrum 67 A1 --- pmNote *[*@$] Origin of the proper motion 68- 72 I5 mas/yr pmRA ? annual proper motion in 0"001 73- 77 I5 mas/yr pmDE ? annual proper motion in 0"001 78- 87 A10 --- DM First identification = DM (Harvard system) (5) 88- 97 A10 --- Name2 Second identification (5) 99-104 A6 --- HD HD designation 105-106 A2 --- m_HD [/0-9 ] second HD (Example: 131843/4) 107-112 A6 --- ADS/BDS ADS number (A) or BDS number (B) 113 A1 --- m_ADS/BDS [a] suffix (a) to an inserted ADS number 114 A1 --- n_IDS [*] The * means that the Index number is built for new component or system; 115-125 A11 --- IDS Uncorrected Index designation (1976.5) (equinox 1900) and identification letter; 127-132 I6 --- HIC ? Hipparcos Input Catalogue (Turon et al.) number
Note (1): The CCDM number is made with RA(2000) limited to 0.1 minute of time (HHMMm) and Dec(2000) limited to 1 minute of a degree (+DDMM). Full details about the construction of the CCDM number are given in the publication. Note (2): The personal catalogue of J.Dommanget (1982; partially updated to 1994) Note (3): See the document file, part III Note (4): The following letters are sometimes used to indicate an approximate location of the secondary component: 'N' (to the North) 'NF'(to the North and following) (first quadrant) 'F' (following) 'SF'(to the South and following) (second quadrant) 'S' (to the South) 'SP'(to the South and preceding) (third quadrant) 'P' (preceding) 'NP'(to the North and preceding) (fourth quadrant) Note (5): .0 = BD .6 = AGK2/3 .2 = CD .8 = SAO .4 = CPD The suffixes "a" and "b" following some DM designations appear in place of the dot. Note on pmNote: *: not the pm from the Index; @: pm from the HIC; $: pm = pm(B/A); Note on Comp and rComp: In one record there appear '?' signs for (CCDM#=) 07366-1428
History: * 08-Dec-1994: File prepared by J. Dommanget [Obs. Royal Bruxelles] F. Ochsenbein and J.L. Halbwachs [CDS] * 14-Nov-1996: Editing of the original ReadMe (1994) was done at the NASA/ADC.
(End) J. Dommanget [Obs. Royal Bruxelles] [NASA/ADC] 14-Nov-1996
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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