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 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:
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FileName Lrecl Records Explanations
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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
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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)
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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
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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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
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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)
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
15- 20 I6 --- HIP Star Hipparcos (Cat. I/239) number
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 28-Aug-1999