Access to Astronomical Catalogues

← Click to display the menu
J/A+A/495/807     Shape parameters for 650 open clusters     (Kharchenko+, 2009)

Shape parameters of the Galactic open clusters. Kharchenko N.V., Berczik P., Petrov M.I., Piskunov A.E., Schilbach E., Roeser S., Scholz R.-D. <Astron. Astrophys. 495, 807 (2009)> =2009A&A...495..807K
ADC_Keywords: Clusters, open ; Morphology Keywords: Galaxy: open clusters and associations: general - solar neighbourhood - Galaxy: stellar content Abstract: Ellipticities have been determined for only a few tens of open clusters. We derive the observed and modelled shape parameters (apparent ellipticity and orientation of the ellipse) of 650 Galactic open clusters identified in the ASCC-2.5 catalogue (Kharchenko, 2001, Cat. I/280). Description: The table presents shape parameters (ellipticity and ellipse orientation angle) of 650 Galactic open clusters. The parameters are derived from distributions of the most probable cluster members. The clusters are a sample of the Catalogue of Open Cluster Data and their members are selected from the high-precision, homogeneous all-sky catalogue ASCC-2.5 (Kharchenko, 2001, Cat. I/280). The clusters in the table are sorted according to their order in the COCD. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table.dat 111 650 Ellipticities and orientation angles for 650 open clusters
See also: I/280 : All-sky Compiled Catalogue of 2.5 million stars (Kharchenko 2001) B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2007) J/A+A/438/1163 : Catalogue of Open cluster Data (COCD) (Kharchenko+, 2005) J/A+A/440/403 : 109 new Galactic open clusters (COCD1) (Kharchenko+, 2005) Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 4 I4 --- COCD [1/1130] COCD number (1-520, 1001-1130) 7- 23 A17 --- Name Cluster designation (NGC, IC or other) 25- 31 F7.2 deg GLON Galactic longitude 32- 38 F7.2 deg GLAT Galactic latitude 39- 45 F7.2 deg lambda Aspect angle in Galactic longitude (1) 46- 52 F7.2 deg beta Aspect angle in Galactic latitude (1) 53- 60 F8.3 mag m-M Distance modulus 61- 66 F6.2 mag E(B-V) Colour-excess 67- 72 I6 pc Dist Distance 73- 78 F6.2 [yr] logt Logarithm of age 79- 84 F6.1 pc r2 Linear cluster radius 85- 89 I5 --- n2 Number of the most probable cluster members 90- 95 F6.2 --- e Ellipticity 96-101 F6.2 --- e_e rms error of the ellipticity 102-106 I5 deg q Orientation angle between the Galactic plane and the largest principal axis of the ellipse 107-111 I5 deg e_q rms error of the orientation angle
Note (1): The aspect angle λ is the angle between the projections of the heliocentric et galactocentric vectors of a cluster, and β the angle between the projections of the 2 vectors onto the meridional place of a cluster.
Acknowledgements: Ralf-Dieter Scholz, rdscholz(at)
(End) Patricia Vannier [CDS] 22-Jan-2009
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

catalogue service

© Université de Strasbourg/CNRS

    • Contact