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J/A+A/278/36        M 31 new OB associations (Magnier+ 1993)

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., Trumper J. <Astron. Astrophys. 278, 36 (1993)> =1993A&A...278...36M (SIMBAD/NED BibCode)
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 31 174 Associations in M 31
See also: II/208 : BVRI CCD photometry in the field of M 31 (Magnier+ 1992) Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
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
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 26-Sep-1997
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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