Detailed Description of Catalogue VII/191/

Url: http://astro.u-strasbg.fr/cgi-bin/Cat?VII/191/

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VII/191             Catalogue of Southern Dark Clouds     (Hartley+ 1986)
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A catalogue of southern dark clouds
     Hartley M., Manchester R.N., Smith R.M., Tritton S.B., Goss W.M.
    <Astron. Astrophys. Suppl. Ser. 63, 27 (1986)>
    =1986A&AS...63...27H        (SIMBAD/NED BibCode)
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ADC_Keywords: Nebulae
Keywords: dark clouds - interstellar matter - star formation - Gould's Belt

Description (Abstract):
    A catalogue of 1101 dark clouds has been compiled from visual
    inspection of ESO/SERC Southern J survey plates for declinations south
    of -33deg. This catalogue complements that of Lynds
    (1962ApJS....7....1L) which is based on the Palomar Sky Survey.
    Equatorial positions of accuracy 10 arcsec or better are listed for
    each cloud along with size (major axis x minor axis), density class
    and ESO/SERC field number. Galactic coordinates, derived from the
    equatorial positions, are used to define a name for each cloud.
    Complexes, consisting of several separately identifiable
    concentrations, are listed and identified by a trailing C on the name.
    The conclusions of Lynds, that clouds are concentrated along the
    galactic equator and toward the galactic centre, are reinforced. No
    clear connection with Gould's Belt is evident in the distribution of
    southern clouds.

File Summary:

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  FileName      Lrecl  Records   Explanations

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ReadMe             80        .   This file
table1             88     1101   The catalogue of Southern Dark Clouds (DCld)

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Byte-by-byte Description of file: table1

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   Bytes Format Units   Label     Explanations

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   1- 10  A10   ---     DCld     *[0-9.+-] Dark Cloud name
      11  A1    ---     n_DCld    [C] 'C' indicates a complex structure
  13- 14  I2    h       RAh       Right Ascension 1950 (hours)
  16- 17  I2    min     RAm       Right Ascension 1950 (minutes)
  19- 20  I2    s       RAs       Right Ascension 1950 (seconds)
      22  A1    ---     DE-       Declination 1950 (sign)
  23- 24  I2    deg     DEd       Declination 1950 (degrees)
  26- 29  F4.1  arcmin  DEm       Declination 1950 (minutes)
  31- 35  F5.1  arcmin  Size1    *Largest angular size
      36  A1    ---     ---       [x] separator
  37- 41  F5.1  arcmin  Size2    *Second angular size
      43  A1    ---     Density  *[ABC] Density class
  45- 47  I3    ---     Field     Field or Plate number of ESO/SERC survey
  49- 88  A40   ---     Comments *Text of Comments

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Note on DCld:
    The name is made from galactic longitude and latitude of the centroid.
Note on Size1, Size2:
    In the case of some curved and elongated clouds, Size1 represents
    the total length of the cloud rather than the overall dimension;
    therefore the product of Size1 x Size2 approximates the area
    of the cloud.
Note on Density: densities are represented by a 3-letter scale
    with A being the most dense and C the least dense.
    Statistics and comparison with Lynds (1962ApJS....7....1L)
    opacity classes:
    ------------------------------------------------------------
    Density   No. of      Mean Size      Median Size     Lynds'
     Class    Clouds   (sq. arc min.)  (sq. arc min.)    opacity
    ------------------------------------------------------------
       A       432          100             22              6
       B       493          560             65            4 or 5
       C       176          420            105            <= 3
    ------------------------------------------------------------
      All     1101          355             50
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Note on Comments: the following abbreviations are used:
    CG = cometary globule
    DC = dark cloud
    RN = reflection nebula
    S-O = Sco-Oph complex which extends into the Sct region.
    Designations preceded by S refer to Sandqvist and Lindroos
    (1976A&A....53..179S) and Sandqvist (1977A&A....57..467S)

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Nomenclature Notes:
    Sources from this catalogue are preferably designated
    <<DCld LLL.l+BB.b>> rather than <<DC LLL.l+BB.b>>

See also:
    VII/7 : Lynds' Catalogue of Dark Nebulae (LDN)

Historical Notes:
    The catalogue was keypunched at CDS.
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(End)                     James Marcout,  Francois Ochsenbein [CDS]  21-Feb-1996

CDS Catalogue Service