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J/A+A/376/441       Absolute proper motions of 112 open clusters (Dias+, 2001)

Proper motions of open clusters within 1 kpc based on the TYCHO2 Catalogue. Dias W.S., Lepine J.R.D., Alessi B.S. <Astron. Astrophys. 376, 441 (2001)> =2001A&A...376..441D
ADC_Keywords: Clusters, open ; Proper motions Keywords: Galaxy: open clusters and associations: general - astrometry Abstract: We present mean absolute proper motions of 112 open clusters, determined using the data from the Tycho2 Catalogue (Cat. I/259). For 28 clusters, this is the first determination of proper motion. The measurements made use of a large number of stars (usually several tens) for each cluster. The total number of stars studied in the fields of the 164 open clusters is 5016, of which 4006 were considered members. The mean proper motions 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). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file clusters.dat 52 112 Cluster positions (from Simbad) table1.dat 53 41 List of clusters for which the statistical method was unable to provide accurate proper motions. table2.dat 87 112 List the parameters provided by the method of Sanders for 112 open clusters pm/* 76 112 Proper motions and membership, by cluster
See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) Byte-by-byte Description of file: clusters.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name Cluster name 20- 21 I2 h RAh Right ascension (J2000.0) 23- 24 I2 min RAm Right ascension (J2000.0) 26- 29 F4.1 s RAs Right ascension (J2000.0) 31 A1 --- DE- Declination sign (J2000.0) 32- 33 I2 deg DEd Declination (J2000.0) 35- 36 I2 arcmin DEm Declination (J2000.0) 38- 39 I2 arcsec DEs Declination (J2000.0) 42- 52 A11 --- FileName File name in "pm" subdirectory (1)
Note (1): For clusters, the following abbreviations are used: col = Collinder rup = Ruprecht vdbh = vdB-Hagen mel = Melotte ros = Roslund ste = Stephenson
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Name of the cluster 15 A1 --- Note [*] Note (1) 17- 18 I2 h RAh Right ascension (J2000.0) 20- 21 I2 min RAm Right ascension (J2000.0) 23- 24 I2 s RAs Right ascension (J2000.0) 27 A1 --- DE- Declination sign 28- 29 I2 deg DEd Declination (J2000.0) 31- 32 I2 arcmin DEm Declination (J2000.0) 34- 37 I4 arcmin D ? Distance in arcmin (1) 40- 43 I4 pc d Distance in pc (1) 48- 51 F4.2 [yr] logAge ? Age (1)
Note (1): Distances and ages obtained from WEBDA, http://obswww.unige.ch/webda For Sigma Orioni, distance from Baumgardt et al., 2000, Cat. J/A+AS/146/251, and age from WEBDA
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Name Name of the cluster 15- 16 A2 --- Notes [:*+ ] Existence of notes (1) 18- 20 I3 --- Nc Estimated number of members in the cluster 22- 26 F5.1 mas/yr pmRACl Mean proper motion of the cluster in mu_alpha.cos(delta), ICRS 28- 32 F5.1 mas/yr pmDECl Mean proper motion of the cluster in mu_delta, ICRS 34- 36 F3.1 mas/yr e_pmRACl Standard deviation in pmRA and pmDE 38- 40 I3 --- Ni Estimated number of field stars 42- 46 F5.1 mas/yr pmRAS Mean proper motion of the field stars in mu_alpha.cos(delta), ICRS 48- 51 F4.1 mas/yr e_pmRAS Standard deviation of the mean proper motion of the field stars in mu_alpha.cos(delta), ICRS 53- 57 F5.1 mas/yr pmDES Mean proper motion of the field stars in mu_delta, ICRS 59- 62 F4.1 mas/yr e_pmDES Standard deviation of the mean proper motion of the field stars in mu_delta, ICRS 64- 70 F7.3 deg theta Rotation angle to the major axis 72- 75 F4.2 mas Plx ? Mean trigonometric parallax (2) 77- 80 F4.2 mas e_Plx ? Standard error in Plx (2) 82- 85 I4 pc d ? Distance from WEBDA (3)
Note (1): The flag denotes: * Clusters that were not previously studied by Baumgardt et al., 2000, Cat. J/A+AS/146/251 +* Clusters for which we derived the mean parallax : Cluster commented in the text Note (2): Data obtained from Baumgardt et al., 2000, Cat. J/A+AS/146/251 Note (3): Obtained from WEBDA, http://obswww.unige.ch/webda
Byte-by-byte Description of file: pm/*
Bytes Format Units Label Explanations
1- 10 I10 mas RAmas Right ascension (J2000.0) from Tycho2 12- 21 I10 mas DEmas Declination (J2000.0) from Tycho2 23- 27 F5.2 mag VTmag Magnitude of the star from Tycho2 30- 32 I3 mas e_RAmas Standard deviation in RA 36- 38 I3 mas e_DEmas Standard deviation in DE 41- 47 F7.2 mas/yr pmRA Proper motion in mu_alpha.cos(delta), ICRS 50- 56 F7.2 mas/yr pmDE Proper motion in mu_delta, ICRS 58- 63 F6.2 mas/yr e_pmRA Standard deviation of the mu_alpha.cos(delta), ICRS 66- 71 F6.2 mas/yr e_pmDE Standard deviation of the mu_delta, ICRS 74- 76 I3 % Pr Membership probability
Acknowledgements: Wilton Dias
(End) Patricia Bauer [CDS] 16-Oct-2001
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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