J/A+A/332/575 Pleiades member list (Belikov+ 1998)
The fine structure of the Pleiades luminosity function and
pre-main sequence evolution
Belikov A.N., Hirte S., Meusinger H., Piskunov A.E., Schilbach E.
<Astron. Astrophys. 332, 575 (1998)>
=1998A&A...332..575B 1998A&A...332..575B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Proper motions
Keywords: open clusters and associations: individual: Pleiades -
stars: luminosity function, mass function - stars: pre-main sequence
Abstract:
The luminosity function (LF) of the Pleiades cluster stars was
constructed for the study of the LF fine structure related to pre-main
sequence (MS) stellar evolution. Theoretical luminosity functions
based on present-day pre-MS and MS stellar models were constructed and
compared with observations. We tested both power- and log-normal laws
describing the cluster star Initial Mass Function (IMF). Both single
star formation burst- and age spread-models were examined. The
agreement between the observed Pleiades colour-magnitude diagram with
the new HIPPARCOS distance and the theoretical ZAMS for a normal
metallicity is excellent when the model positions in the HR diagram
are corrected to the helium abundance Y=0.34. The corresponding age of
the cluster is logt=7.95. Three features (dips) were found in the
observed cluster LF in a magnitude range MV=5-12mag. Two of them
(at MV=7.5mag and 9.5mag) are assumed to be field LF features:
Wielen and Kroupa dips. Theoretical models fail to reproduce them. We
attributed the third (brightest) detail (the dip at MV=5.5mag) to
the pre-MS evolution of Pleiades stars. The observed Pleiades LF
corresponds in its brighter part to the standard Population I IMF. The
log-normal IMF fits the observations much better than a simple
power-law IMF. The brightest LF feature could be reproduced in the
theoretical LF if a substantial age spread of order of several tens of
Myrs is supposed to exist among the Pleiades stars.
Description:
This catalogue contains a list of the Pleiades stars used for the
construction of the luminosity function. Additional 24 bright members
were taken from the BDA (Mermilliod, 1988BICDS..35...77M 1988BICDS..35...77M,
1992BICDS..40..115M 1992BICDS..40..115M) The corresponding data could be retrieved from
the BDA according their designations provided below:
BDA-No.: 298, 447, 468, 541, 559, 563, 785, 717, 859, 956,
980, 1306, 1338, 1375, 1380, 1432, 1823, 2168, 2181, 2507,
2690, 3313, 3317, 3327.
The catalogue includes 737 cluster members selected on the basis of
proper motion and photometric criteria as it is described by Belikov
et. al (1998A&A...332..575B 1998A&A...332..575B). Only 622 "inner" members (with radial
distance from the cluster center less than 111.68 arcmin), indicated
with spflag=1 were used for the LF construction. 277 stars (n_Vmag=1)
have photoelectric V magnitudes from BDA, for the rest (n_Vmag=0)
the photographic magnitudes from Schilbach et al. (1995,
Cat. J/A+A/299/696) survey were used.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 69 737 Star member list in the Pleiades
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/A+A/299/696 : Pleiades field Membership probabilities (Schilbach+, 1995)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- SRS95 Star number from Schilbach et al. (1995,
Cat. J/A+A/299/696)
8 I1 --- spflag Spatial position flag (1)
10 I1 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 19 F5.2 s RAs Right ascension (J2000)
20 A1 --- DE- Declination sign
21- 22 I2 deg DEd Declination (J2000)
24- 25 I2 arcmin DEm Declination (J2000)
27- 30 F4.1 arcsec DEs Declination (J2000)
32- 35 F4.1 mas/yr pmRA Proper motion along right ascension direction
37- 40 F4.1 mas/yr e_pmRA Error in proper motion pmRA
42- 46 F5.1 mas/yr pmDE Proper motion along declination axis
48- 51 F4.1 mas/yr e_pmDE Error in proper motion pmDE
53- 57 F5.2 mag Vmag V magnitude
59 I1 --- n_Vmag Magnitude type flag (2)
61- 64 F4.2 --- member Proper motion membership probability
66- 69 I4 --- BDA Star number in the BDA, Mermilliod
(1988BICDS..35...77M 1988BICDS..35...77M, 1992BICDS..40..115M 1992BICDS..40..115M)
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Note (1): 1: radial distance less than 111.68 arcmin
0: radial distance greater than or equal to 111.68 arcmin
Note (2): 1: photoelectric V-mags taken from BDA
0: photographic V-mags taken from
Schilbach et al. (1995, Cat. J/A+A/299/696) survey
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Acknowledgements: Anatoly Piskunov
References:
Mermilliod, J.-C., 1988BICDS..35...77M 1988BICDS..35...77M
Mermilliod, J.-C., 1992BICDS..40..115M 1992BICDS..40..115M
(End) Patricia Bauer [CDS] 02-Apr-1998