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J/A+A/278/36        M 31 new OB associations (Magnier+ 1993)
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Automated identification of OB associations in M 31
    Magnier E.A., Battinelli P., Lewin W.H.G., Haiman Z., Van Paradijs J.,
    Hasinger G., Pietsch W., Supper R., Truemper J.
   <Astron. Astrophys. 278, 36 (1993)>
   =1993A&A...278...36M      (SIMBAD/NED BibCode)
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ADC_Keywords: Associations, stellar ; Positional data
Keywords: galaxies: individual: M 31 - galaxies: spiral -
          galaxies: star clusters - methods: data analysis

Abstract:
    A new identification of OB associations in M 31 has been performed
    using the Path Linkage Criterion technique of Battinelli
    (1991A&A...244...69B). We found 174 associations with a very small
    contamination (<5%) by random clumps stars. The expected total number
    and average size of OB associations in the region of M 31 covered by
    our data set (Magnier et al., 1992, Cat. <II/208>) are ~280 and ~90pc,
    respectively. M 31 associations therefore have sizes similar to those
    of OB associations observed in nearby galaxies, so that we can
    consider them to be classical OB associations. This list of OB
    associations will be used for the study of the spatial distribution of
    OB associations and their correlation with other objects. Taking into
    account the fact that we do not cover the entire disk of M 31, we
    extrapolate a total number of associations in M 31 of ~420.

File Summary:
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  FileName        Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             31      174   Associations in M 31
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See also:
    II/208 : BVRI CCD photometry in the field of M 31 (Magnier+ 1992)

Byte-by-byte Description of file: table1
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   Bytes Format Units   Label     Explanations
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   1-  3  I3    ---     MLB93     OB association number
   5- 13  F9.6  deg     RAdeg     Right ascension (J2000.0)
  15- 23  F9.6  deg     DEdeg     Declination (J2000.0)
  25- 27  I3    pc      Diam      Clump diameter
  29- 31  I3    ---     NStar     Number of stars
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History: Prepared via OCR at CDS.
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(End)                           James Marcout, Patricia Bauer [CDS]  26-Sep-1997