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 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 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.
(End) James Marcout, Patricia Bauer [CDS] 26-Sep-1997