J/A+A/446/949 Open clusters proper motions based on UCAC2 (Dias+, 2006)
Proper motion determination of open clusters based on the UCAC2 catalogue.
Dias W.S., Florio, V., Assafin M., Alessi B.S., Libero V.
<Astron. Astrophys. 446, 949 (2006)>
=2006A&A...446..949D 2006A&A...446..949D
ADC_Keywords: Clusters, open ; Proper motions
Keywords: galaxy: open clusters and associations: general - catalogs
Abstract:
We present the kinematics of hundreds of open clusters, based on the
UCAC2 Catalogue positions and proper motions. Membership probabilities
were obtained for the stars in the cluster fields by applying a
statistical method uses stellar proper motions. All open clusters with
known distance were investigated, and for 75 clusters this is the
first determination of the mean proper motion. The results, including
the DSS images of the cluster's fields with the kinematic members
marked, are incorporated in the Open Clusters Catalogue supported on
line by our group.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 101 430 List the parameters provided by the statistical
method for 430 open clusters
pm/* 237 430 Proper motions and membership, by cluster
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/289 : UCAC2 Catalogue (Zacharias+ 2004)
http://www.astro.iag.usp.br/~wilton : Open clusters and Galactic structure
http://obswww.unige.ch/webda : WEBDA database
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Cluster name
16 A1 --- Note [*] * for unpublished values
18- 23 F6.2 mas/yr pmRACl Mean proper motion of the cluster
in mu_alpha.cos(delta), ICRS
25- 30 F6.2 mas/yr pmDECl Mean proper motion of the cluster
in mu_delta, ICRS
32- 35 F4.2 mas/yr e_pmRACl Error in pmRA,and pmDEC ICRS
37- 40 I4 --- Nc Estimated number of members in the cluster
42- 47 F6.2 mas/yr pmRAS Mean proper motion of the field stars
in mu_alpha.cos(delta), 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_pmRAS Standard deviation of the mean proper motion of
the field stars in mu_alpha.cos(delta), ICRS
62- 66 F5.2 mas/yr e_pmDES Standard deviation of the mean proper motion
of the field stars in mu_delta, ICRS
68- 71 I4 --- Nfield Estimated number of field stars
73- 79 F7.3 deg theta Rotation angle to the major axis
81- 82 I2 arcmin Rad Radius (centered in the coordinates of the
cluster) used to extract the stars from the
UCAC2 Catalogue
84-101 A18 --- Table Name of the table in "pm" subdirectory
containing proper motions and membership
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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- 5 I5 --- Seq Internal number
8- 14 F7.4 arcmin Rad Radius (centered in the coordinates of the
cluster) used to extract the stars from
the UCAC2 Catalogue
17- 18 I2 h RAh Right Ascension J2000 (hours), at J2000.0
20- 21 I2 min RAm Right Ascension J2000 (minutes)
23- 28 F6.3 s RAs Right Ascension J2000 (seconds)
31 A1 --- DE- Declination J2000 (sign)
32- 33 I2 deg DEd Declination J2000 (degrees), at J2000.0
35- 36 I2 arcmin DEm Declination J2000 (minutes)
38- 42 F5.2 arcsec DEs Declination J2000 (seconds)
45- 52 I08 --- 2UCAC [00000001,48330571] UCAC (I/289) designation
55- 65 F11.7 deg RAdeg Right ascension (degrees), ICRS, Ep=J2000
68- 78 F11.7 deg DEdeg Declination (degrees), ICRS, Ep=J2000
84- 86 I3 mas e_RAdeg Minimal mean error on RAdeg
92- 94 I3 mas e_DEdeg Minimal mean error on DEdeg
97- 99 I3 mas ePos Error of original UCAC observation
102-106 F5.2 mag UCmag Magnitude in UCAC system (579-642nm)
109-110 I2 --- No Number of UCAC observations for the star
113-114 I2 --- Nc Number of catalog positions used for pmRA, pmDE
117-118 I2 --- cfl Major catalogs used in pmRA, pmDE (1)
121-128 F8.3 yr EpRA Central epoch for mean RA
131-138 F8.3 yr EpDE Central epoch for mean Declination
141-148 F8.1 mas/yr pmRA Proper motion in RA*cos(DE)
151-158 F8.1 mas/yr pmDE Proper motion in Dec
162-165 F4.1 mas/yr e_pmRA Mean error on pmRA
169-172 F4.1 mas/yr e_pmDE Mean error on pmDE
175-179 F5.2 --- qpmRA Goodness of fit for pmRA
182-186 F5.2 --- qpmDE Goodness of fit for pmDE
189-198 I10 --- 2Mkey 2MASS (II/246) Unique source identifier
201-206 F6.3 mag Jmag ? J magnitude (1.2um) from 2MASS
209-214 F6.3 mag Hmag ? H magnitude (1.6um) from 2MASS
217-222 F6.3 mag Kmag ? K magnitude (2.2um) from 2MASS
225-227 I03 --- phf 2MASS photometric quality flag
230-232 I03 --- ccf 2MASS confusion flag
234-236 I3 % Pr Membership probability
237 A1 --- --- [%]
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Note (1): Identifier of some major catalogs used in the computation of
proper motions, which also provides the user with information
regarding known, high proper motion stars. However, this flag does
not contain all catalogs going into the proper motions. The cfl value
is actually a sum of numbers, each with the following meaning:
1 = modified Yellow Sky (NOFS scans of NPM, SPM; not published)
2 = AC2000.2 Catalog (I/275)
4 = Tycho-2 Catalogue observed position (I/259)
8 = USNO measurement of AGK2 plates (not published)
16 = Hipparcos Catalogue (I/239)
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Acknowledgements: Wilton Dias, wilton(at)usp.br
Extensive use has been made of the Simbad and WEBDA databases.
This project is supported by FAPESP (grant number 03/12813-4)
(End) Patricia Vannier [CDS] 24-Jan-2006