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Automated identification of OB associations in M31A new identification of OB associations in M31 has been performed using the Path Linkage Criterion (PLC) technique of Battinelli (1991). We found 174 associations with a very small contamination (less than 5%) by random clumps of 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) are approximately 280 and approximately 90 pc, respectively. M31 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 M31, we extrapolate a total number of association in M31 of approximately 420.
Document ID
19950042463
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Magnier, Eugene A.
(Massachusetts Inst. of Technology, Cambridge, MA United States)
Battinelli, Paolo
(Osservatorio Astronomico di Roma Roma, Italy)
Lewin, Walter H. G.
(Massachusetts Inst. of Technology, Cambridge, MA United States)
Haiman, Zoltan
(Massachusetts Inst. of Technology, Cambridge, MA United States)
Paradijs, Jan Van
(Univ. of Amsterdam Amsterdam, Netherlands)
Hasinger, Guenther
(Max-Planck-Inst. fuer Extraterrestriche Physik Muenchen, Germany)
Pietsch, Wolfgang
(Max-Planck-Inst. fuer Extraterrestriche Physik Muenchen, Germany)
Supper, Rodrigo
(Max-Planck-Inst. fuer Extraterrestriche Physik Muenchen, Germany)
Truemper, Joachim
(Max-Planck-Inst. fuer Extraterrestriche Physik Muenchen, Germany)
Date Acquired
August 16, 2013
Publication Date
October 1, 1993
Publication Information
Publication: Astronomy and Astrophysics
Volume: 278
Issue: 1
ISSN: 0004-6361
Subject Category
Astronomy
Accession Number
95A74062
Funding Number(s)
CONTRACT_GRANT: NAG5-1441
CONTRACT_GRANT: NATO-RG-331/88
CONTRACT_GRANT: NAGW-3234
Distribution Limits
Public
Copyright
Other

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