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J/A+A/329/101 Masses of Pleiades members (Raboud+ 1998)
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Investigation of the Pleiades cluster. IV. The radial structure.
Raboud D., Mermilliod J.-C.
<Astron. Astrophys. 329, 101 (1998)>
=1998A&A...329..101R (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Stars, masses
Keywords: cluster: open: individual: Pleiades - binary: spectroscopic
Abstract:
On the basis of the best available member list and duplicity
information, we have studied the radial distribution of 270 stars and
multiple systems earlier than K0 in the Pleiades. Five new long period
spectroscopic binaries have been identified from the CORAVEL
observations. We have found a clear mass segregation between binaries
and single stars, which is explained by the greater average mass of
the multiple systems. The mass function of the single stars and
primaries appears to be significantly different. While the central
part of the cluster is spherical, the outer part is clearly
elliptical, with an ellipticity of 0.17. The various parameters
describing the Pleiades are (for a distance of 125pc): core radius
r_c_=0.6 deg (1.4pc), tidal radius r_t_=7.4 (16pc), half mass radius
r_m/2_=0.88 (1.9pc), harmonic radius r=1.82 (4pc). Low-mass stars
(later than K0) probably extend further out and new proper motion and
radial velocity surveys over a larger area and to fainter magnitudes
would be very important to improve the description of the cluster
structure and complete mass function.
Objects:
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RA (2000) DE Designation(s)
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03 47.0 +24 07 Pleiades = Cl Melotte 22
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 120 270 Star member list in the Pleiades
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See also:
J/A+A/320/74 : Radial velocities of Pleiades members (Mermilliod+ 1997)
Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 5 I5 --- HII Star number from Herzsprung (See Cat. <I/90>)
8- 12 F5.2 mag Vmag V magnitude
15- 19 F5.2 mag B-V B-V colour
22- 28 F7.2 arcmin xpos x coordinate (1)
31- 37 F7.2 arcmin ypos y coordinate (1)
40- 45 F6.2 arcmin Dist Distance from the cluster center
49 I1 --- Mult [1/4] Multiplicity status
52- 63 A12 --- Rem Remarks
66- 69 F4.2 solMass Mass Total mass
74- 77 F4.2 solMass MassA ? Component A mass
84- 87 F4.2 solMass MassB ? Component B mass
92- 95 F4.2 solMass MassC ? Component C mass
99-102 F4.2 solMass MassD ? Component D mass
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Note (1): x is oriented West to East (- --> +)
y is oriented South to North (- -> +)
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Acknowledgements: Didier Raboud <Didier.Raboud@obs.unige.ch>
References:
Rosvick et al., Paper I. 1992A&A...255..130R
Mermilliod et al., Paper II. 1992A&A...265..513M
Mermilliod et al., Paper III. 1997A&A...320...74M = Cat. <J/A+A/320/74>
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(End) Patricia Bauer [CDS] 20-Aug-1997