J/A+A/388/168 Absolute proper motions of 93 open clusters (Dias+, 2002)
Proper motions of open clusters based on the TYCHO2 Catalogue.
II. Clusters farther than 1 kpc.
Dias W.S., Lepine J.R.D., Alessi B.S.
<Astron. Astrophys. 388, 168 (2002)>
=2002A&A...388..168D 2002A&A...388..168D
ADC_Keywords: Clusters, open ; Proper motions
Keywords: Galaxy: open clusters and association: general
Abstract:
We determined the mean absolute proper motion of 93 open clusters
situated farther than 1 kpc from the Sun. The results are derived from
the stellar proper motion data given in the Tycho2 Catalogue
(I/259). The mean proper motion of the clusters and membership
probability of individual stars were obtained from the proper motion
data by applying the statistical method proposed by Sanders
(1971A&A....14..226S 1971A&A....14..226S). The measurements made use of a large number of
stars, usually several tens, for each cluster. The total number of
stars investigated in the fields of the clusters is 4864 of which 2021
were considered members. For 55 clusters, this is the first
determination of the proper motion. The distances, ages and kinematics
parameters of the clusters can be accessed at
http://www.iagusp.usp.br/~wilton
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 80 93 List the parameters provided by the method
of Sanders for 93 open clusters
notes.dat 80 42 Individual notes
pm/* . 93 Proper motions and membership, by cluster
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/215 : Tables of membership for 43 open clusters (Zhao+, 1995)
II/124 : UBV and MK types in Open Clusters, 3rd ed. (Mermilliod 1986)
IV/17 : HD,HDE,DM Identifications in Open Clusters (Mermilliod 1986)
V/19 : Masses and Ages of Stars in 68 Open Clusters (Piskunov 1980)
VII/92 : Open Cluster Data 5th Edition (Lynga 1987)
J/A+A/345/471 : Memberships of open clusters (Robichon+, 1999)
J/A+A/376/441 : Absolute proper motions of 112 open clusters (Dias+, 2001)
http://www.iagusp.usp.br/~wilton : Open clusters and galactic structure
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Name of the cluster
9 A1 --- f_Cluster [*] Note detailed in notes.dat file
11- 12 I2 --- Nmemb Estimated number of members in the cluster
14- 18 F5.2 mas/yr pmRACl Mean proper motion of the cluster in
mu_alpha.cos(Dec), ICRS
20- 25 F6.2 mas/yr pmDECl Mean proper motion of the cluster in
mu_delta, ICRS
27- 30 F4.2 mas/yr e_pmRACl Standard deviation in pmRA and pmDE
32- 34 I3 --- Nfield Estimated number of field stars
36- 41 F6.2 mas/yr pmRAS Mean proper motion of the field stars in
mu_alpha.cos(Dec), ICRS
43- 47 F5.2 mas/yr e_pmRAS Standard deviation of the mean proper motion
of the field stars in mu_alpha.cos(Dec), ICRS
49- 54 F6.2 mas/yr pmDES Mean proper motion of the field stars in
mu_delta, ICRS
56- 60 F5.2 mas/yr e_pmDES Standard deviation of the mean proper motion
of the field stars in mu_delta, ICRS
62- 68 F7.3 deg theta Rotation angle to the major axis
70- 80 A11 --- FileName Name of the file containing the complete data,
in "pm" subdirectory
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
10- 80 A71 --- Note Text of the note
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Byte-by-byte Description of file: pm/*
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Bytes Format Units Label Explanations
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1- 10 I10 mas RAmas Right ascension (2000.0) from Tycho2, I/259
12- 21 I10 mas DEmas Declination (2000.0) from Tycho2, I/259
25- 29 F5.2 mag VTmag Magnitude of the star from Tycho2, I/259
33- 35 I3 mas e_RAmas Standard deviation in RA
39- 41 I3 mas e_DEmas Standard deviation in DE
43- 50 F8.3 yr EpRA,DE Mean epoch of observation from Tycho2, I/259
54- 60 F7.2 mas/yr pmRA Proper motion in mu_alpha.cos(Dec), ICRS
63- 69 F7.2 mas/yr pmDE Proper motion in mu_delta, ICRS
71- 76 F6.2 mas/yr e_pmRA Standard deviation of the
mu_alpha.cos(Dec), ICRS
79- 84 F6.2 mas/yr e_pmDE Standard deviation of the mu_delta, ICRS
90- 91 I2 h RAh Right Ascension J2000 (hours), at EpRA,DE
93- 94 I2 min RAm Right Ascension J2000 (minutes)
96-101 F6.3 s RAs Right Ascension J2000 (seconds)
104 A1 --- DE- Declination J2000 (sign)
105-106 I2 deg DEd Declination J2000 (degrees), at EpDE,DE
109-110 I2 arcmin DEm Declination J2000 (minutes)
113-117 F5.2 arcsec DEs Declination J2000 (seconds)
121-132 A12 --- TYC Tycho2 identifier, I/259
135-140 I6 --- HIP Hipparcos identifier, I/239
141 A1 --- m_HIP Multiplicity index on HIP
144-146 I3 % Memb Membership probability
147 A1 --- --- [%]
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Acknowledgements: Wilton S Dias or
(End) Patricia Bauer [CDS] 13-Jun-2002