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J/A+A/333/897       Mass segregation in open clusters (Raboud+ 1998)

Evolution of mass segregation in open clusters: some observational evidences Raboud D., Mermilliod J.-C. <Astron. Astrophys. 333, 897 (1998)> =1998A&A...333..897R
ADC_Keywords: Clusters, open ; Photometry ; Stars, distances ; Stars, masses Keywords: clusters: open - individual: Praesepe, NGC 6231 - star: formation Abstract: On the basis of the best available member list and duplicity information, we have studied the radial structure of Praesepe and of the very young open cluster NGC 6231. We have found mass segregation among the cluster members and between binaries and single stars, which is explained by the greater average mass of the multiple systems. However, the degree of mass segregation for stars between 1.5 and 2.3M is less pronounced in Praesepe than in the Pleiades. Furthermore, mass segregation is already present in the very young open cluster NGC 6231 although this cluster is likely still not dynamically relaxed. We discuss the implications of these results and propose a qualitative scenario for the evolution of mass segregation in open clusters. In Praesepe the mass function of single stars and primaries appears to be significantly different, like in the Pleiades. We observe an absence of ellipticity of the outer part of Praesepe. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 08 40.4 +19 40 Praesepe = NGC 2632 = M 44 16 54.2 -41 48 NGC 6231 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 74 185 Member stars in Praesepe table3.dat 82 300 Member stars in NGC 6231
See also: J/A+A/325/167 : Geneva photometry in NGC 6231 (Raboud+ 1997) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- KW Star identification (Cl* NGC 2632 KW NNN in Simbad database) 7- 11 F5.2 mag Vmag V magnitude 14- 17 F4.2 mag B-V B-V colour index 20- 26 F7.2 arcmin Xpos x coordinate (1) 29- 35 F7.2 arcmin Ypos y coordinate (1) 37- 42 F6.2 arcmin Dist Distance from the cluster center 44 I1 --- Mult [1/3] Multiplicity status (G1) 46- 54 A9 --- Type Binary type (G2) 56- 59 F4.2 solMass MassTot Total mass 61- 64 F4.2 solMass MassA Component A mass 66- 69 F4.2 solMass MassB ? Component B mass 71- 74 F4.2 solMass MassC ? Component C mass
Note (1): Origin (1950.0), RA = 08 37 32 ; DE = +19 48.8 y increasing to North , x to East
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- NGC6231 Star identification (NGC 6231 NNN in Simbad database) 7- 11 F5.2 mag Vmag V magnitude 14- 18 F5.2 mag col Colour ((B-V)J, (B-V)G or b-y) (1) 21- 24 A4 --- phot Photometry used (Gen, UBV or uvby) 28- 33 F6.2 arcmin Xpos x coordinate (2) 37- 42 F6.2 arcmin Ypos y coordinate (2) 46- 50 F5.2 arcmin Dist Distance from the cluster center 53 I1 --- Mult [1/2] Multiplicity status (G1) 56- 62 A7 --- Type Binary type (G1) 65- 69 F5.2 solMass MassTot Total mass 72- 76 F5.2 solMass MassA ? Component A mass 78- 82 F5.2 solMass MassB ? Component B mass
Note (1): The colour is (B-V)(Johnson) if the photometry used (phot column) is UBV, (B-V)(Geneva) if the photometry used is Gen and (b-y) if the photometry used is uvby. Note (2): Origin (1950.0) RA = 16 50 41 ; DE =-41 44.9 y increasing to North , x to East
Global Notes: Note (G1): Multiplicity status, defined as follows: 1 = Single 2 = Double 3 = Triple Note (G2): Binary type, defined as follows: Occ = Occultation binary PHB = Photometric binary SB = Spectroscopic binary VB = visual binary
Acknowledgements: Didier Raboud
(End) Raboud [Geneva Observatory] 20-Feb-1998
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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