J/other/NewAR/90.1549 Catalogue of OB Associations (Wright, 2020)
OB Associations and their origins.
Wright N.J.
<New Astronomy Reviews, 90, 101549 (2020)>
=2020NewAR..9001549W 2020NewAR..9001549W (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Stars, OB ; Clusters, open ;
Stellar distribution
Keywords: OB associations - star clusters - young stars - star formation -
stellar kinematics and dynamics
Abstract:
OB associations are unbound groups of young stars made prominent by
their bright OB members, and have long been thought to be the expanded
remnants of dense star clusters. They have been important in
astrophysics for over a century thanks to their luminous massive
stars, though their low-mass members have not been well studied until
the last couple of decades. This has changed thanks to data from X-ray
observations, spectroscopic surveys and astrometry from Gaia that
allows their full stellar content to be identified and their dynamics
to be studied, which in turn is leading to changes in our
understanding of these systems and their origins, with the old picture
of Blaauw (1964a) now being superseded. It is clear now that OB
associations have considerably more substructure than once envisioned,
both spatially, kinematically and temporally. These changes have
implications for the star formation process, the formation and
evolution of planetary systems, and the build-up of stellar
populations across galaxies.
Description:
We present an updated census of known OB associations compiled from
Ruprecht (1966, IAU Trans,, 12, 348), de Zeeuw et al.
(1999AJ....117..354D 1999AJ....117..354D, Cat. J/AJ/117/354) and Brown et al. (1999, NATO
advanced science institutes (ASI) series c. Lada, C.J., Kylafis, N.D.
eds. 540, 411).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 150 78 Census of known OB associations
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See also:
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Name of OB association as per Ruprecht
(1966, IAU Trans,, 12, 348)
15 A1 --- Code [ABC] Reliability of the association's
existence (1)
17- 21 F5.1 deg GLON Galactic longitude
23- 27 F5.1 deg GLAT Galactic latitude
29- 32 I4 pc Dist Distance
34- 36 I3 pc e_Dist ? Uncertainty on the distance (2)
38- 56 A19 --- r_Dist Reference for the distance
59 A1 --- l_Age Limit flag on Age
61- 64 F4.1 Myr Age ? Age
66- 69 F4.1 Myr e_Age ? Uncertainty on the age (2)
71- 89 A19 --- r_Age Reference for the age
91-120 A30 --- Cluster List of young or open clusters part of the
association
122-150 A29 --- Nebulae List of nebulae that are part of the
association
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Note (1): Reliability of the association's existence as follows:
A = High-confidence
B = Very little known
C = existence uncertain
Note (2): If no uncertainty is provided, the distance is considered tentative.
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Acknowledgements:
Nicholas J. Wright, n.j.wright(at)keele.ac.uk
(End) Nicholas Wright [Keele, UK], Patricia Vannier [CDS] 07-Jun-2021