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J/A+A/345/471       Memberships of open clusters             (Robichon+, 1999)

Open clusters with Hipparcos. I. Mean astrometric parameters. Robichon N., Arenou F., Mermilliod J.-C., Turon C. <Astron. Astrophys. 345, 471 (1999)> =1999A&A...345..471R
ADC_Keywords: Clusters, open ; Populations, stellar ; Radial velocities Keywords: stars: distances - Galaxy: open clusters and associations: general Abstract: New memberships, mean parallaxes and proper motions of all 9 open clusters closer than 300pc (except the Hyades) and 9 rich clusters between 300 and 500pc have been computed using Hipparcos (Cat. I/239) data. Precisions, ranging from 0.2 to 0.5mas for parallaxes and 0.1 to 0.5mas/yr for proper motions, are of great interest for calibrating photometric parallaxes as well as for kinematical studies. Careful investigations of possible biases have been performed and no evidence of significant systematic errors on the mean cluster parallaxes has been found. The distances and proper motions of 32 more distant clusters, which may be used statistically, are also indicated. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 50 18 Equatorial coordinates (J2000.0) from Lynga (1987, Cat. VII/92) and mean radial velocity of the cluster centres tablea1.dat 39 38 Hipparcos cluster members flagged as multiple stars in HIP (Cat. I/239) and not used for the calculation of the cluster mean astrometric parameters tablea2.dat 20 326 Hipparcos cluster members used for the calculation of the cluster mean astrometric parameters
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Cluster Cluster name 14 A1 --- n_Cluster [*] Note on Cluster (1) 16- 17 I2 h RAh Right ascension (J2000.0) 19- 20 I2 min RAm Right ascension (J2000.0) 22- 23 I2 s RAs Right ascension (J2000.0) 25 A1 --- DE- Declination sign (J2000.0) 26- 27 I2 deg DEd Declination (J2000.0) 29- 32 F4.1 arcmin DEm Declination (J2000.0) 34- 38 F5.1 km/s RV Radial velocity 41- 43 F3.1 km/s e_RV rms uncertainty on RV 46- 48 I3 --- Nstar Number of members used to compute the mean radial velocity 50 I1 --- Note [1,2] Note (2)
Note (1): *: coordinates from Raboud & Mermilliod, 1998, Cat. J/A+A/329/101 Note (2): the numbers have the following meaning: 1: CORAVEL mean value of members selected from CORAVEL and photometric data 2: mean value from the WEB Catalogue (Duflot et al., 1995, Cat. III/190) of selected Hipparcos members
Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Cluster Cluster name 15 A1 --- H59 [COGVX] Double/Multiple Systems flag (1) 17- 22 I6 --- HIP Star Hipparcos (Cat. I/239) number
Note (1): the flag has the following meaning: C: solutions for the components G: acceleration or higher order terms O: orbital solutions V: variability-induced movers (apparent motion arises from variability) X: stochastic solution (probably astrometric binaries with short period)
Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Cluster Cluster name 15- 20 I6 --- HIP Star Hipparcos (Cat. I/239) number
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 28-Aug-1999
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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