J/A+A/360/472 Proper motions in omega Centauri (van Leeuwen+, 2000)
A proper motion study of the globular cluster omega Centauri
van Leeuwen F., Le Poole R.S., Reijns R.A., Freeman K.C., de Zeeuw P.T.
<Astron. Astrophys. 360, 472 (2000)>
=2000A&A...360..472V 2000A&A...360..472V
ADC_Keywords: Clusters, globular ; Stars, variable ; Proper motions ;
Photometry, UBV
Keywords: telescopes - celestial mechanics, stellar dynamics -
Galaxy: globular clusters: individual: NGC 5139
Description:
The tables present the photometric and astrometric results of an
extensive proper motion study of the globular cluster omega Centauri:
information on the photographic plates used, variability analysis,
astrometric data for 9847 stars, membership determination and surface
density profile, cluster proper motion dispersions and systematics and
cross-references with star-numbers used by
Norris et al. (1997ApJ...487L.187N 1997ApJ...487L.187N) and
Lynga (1996A&AS..115..297L 1996A&AS..115..297L).
Objects:
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RA (2000) DE Designation(s)
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13 26 45.9 -47 28 37 NGC 5139 = omega Cen
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 48 100 Plates used in the present study
table3a.dat 54 19 Identifiers and periods for slowly varying stars
table3b.dat 54 173 Identifiers and periods for short period stars
table5.dat 126 9847 Summary of results for individual stars
table6.dat 64 38 Membership determination results
table8.dat 67 37 Transverse and radial proper motions
table9.dat 18 164 Cross-identification with Norris et al.,
1997ApJ...487L.187N 1997ApJ...487L.187N & Lynga, 1996A&AS..115..297L 1996A&AS..115..297L
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See also:
J/MNRAS/250/314 : CCD photometry of omega Cen (Noble+ 1991)
J/AJ/119/1225 : Stroemgren photometry of Omega Cen & NGC 6397 (Hughes+, 2000)
J/AJ/108/1350 : Omega Cen FUV photometry (Whitney+, 1994)
J/A+AS/115/297 : BVRI photometry of Central Field of Omega Cen (Lynga+, 1996)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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2- 6 A5 --- Plate Plate identifier
9- 13 F5.2 yr Ep-1900 Epoch of plate
16- 20 F5.2 h HA Hour angle of observation
23- 24 I2 min ExpTime Exposure time
27- 30 I4 --- Ref* Reference stars used in plate transformation
33- 36 I4 --- Nobj Total number of used stars on plate
39- 42 F4.2 --- sigx Unit-weight standard deviation in x (1)
45- 48 F4.2 --- sigy Unit-weight standard deviation in y (1)
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Note (1): Equal to the square root of the normalized {khi}2
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Byte-by-byte Description of file: table3[ab].dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- VLR Variable identifier (NNN or O_NNN, this study)
(Cl* NGC 5139 VLR VNNN or NGC 5139 VLR O-NNN
in Simbad)
7- 11 I5 --- LEID Leiden number (current paper)
(Cl* NGC 5139 LEID NNNNN)
14- 24 F11.7 d Pnew ? Period as derived from current data
27- 30 I4 10-5d e_Pnew ? Estimated error on Pnew
34- 44 F11.7 d Pold ? Period as given by Martin
(1938AnLei..17b...1M 1938AnLei..17b...1M)
46- 48 I3 10-5d e_Pold ? Error on Pold
52- 54 A3 --- Notes [PALi1-9, ] Notes on variability (1)
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Note (1): Notes use the following symbols:
P = period is changing
PA = period is changing, new period often ambiguous
i = noisy or irregular light curve
L = Long-term variable
1 = Superimpised eclipses ?
2 = Possibly eclipsing at twice the period
3 = Maximum 0.6mag fainter in new epoch data
4 = Alternative periods possible
5 = No confirmation of Martin (1938AnLei..17b...1M 1938AnLei..17b...1M) period
6 = Alternative period 0.501026d
7 = New epoch data very noisy
8 = new epoch data fainter at maximum
9 = Period very uncertain
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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2- 6 I5 --- LEID Leiden Identifier (Cl* NGC 5139 LEID NNNNN)
8- 16 F9.5 deg RAdeg Right Ascension (ICRS)
18- 20 I3 mas e_RAdeg Formal error on RA.cos(DE)
22- 30 F9.5 deg DEdeg Declination (ICRS)
32- 34 I3 mas e_DEdeg Formal error on DE
36- 41 F6.1 mas/yr pmRA Absolute proper motion in RA
43- 48 F6.1 mas/yr pmDE Absolute proper motion in DE
50- 56 F7.2 mas/yr pmX Relative proper motion in x-direction
58- 61 I4 0.01mas/yr e_pmX Formal error on µx
63- 69 F7.2 mas/yr pmY Relative proper motion in y-direction
71- 73 I3 0.01mas/yr e_pmY Formal error on µy
75- 77 I3 --- Nobs Number of observations
79- 81 I3 yr DeltaT Effective epoch spread
83- 87 F5.2 yr Ep-1900 Mean epoch
89- 94 F6.3 mag Bmag ?=0.000 Mean photographic magnitude
97-101 F5.3 mag e_Bmag Formal error on mean photographic magnitude
103-108 F6.3 mag B-V ? Colour index B-V
110 I1 --- r_B-V [0/2] Source of B-V colour (1)
112 I1 --- Class Class: from 0, completely free images,
to 4, badly disturbed by neighbour(s)
114-116 I3 % Prob Cluster membership probability
118-121 I4 --- RGO Identifier from Woolley et al.,
1966ROAn....2....1W 1966ROAn....2....1W (NGC 5139 NNNN)
123-126 I4 --- Lyng Identifier from Lynga, 1996A&AS..115..297L 1996A&AS..115..297L
(Cl* NGC 5139 L NNNN in Simbad)
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Note (1): Source of B-V colour is as follows:
0 = CCD photometry
1 = RGO photographic, corrected
2 = No data available
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 F3.1 cm r1 Inner radius on plate
6- 8 F3.1 cm r2 Outer radius on plate
11- 15 F5.2 arcmin R1 Inner radius on sky
18- 22 F5.2 arcmin R2 Outer radius on sky
25- 27 I3 --- Nstar Number of stars in the ring
30- 34 F5.1 --- Ncluster Number of cluster members in the ring
37- 40 F4.1 --- e_Ncluster Formal error on Ncluster
43- 46 F4.2 mas/yr sd Cluster star proper motion dispersion
49- 52 F4.2 mas/yr e_sd Formal error on sd
55- 57 F3.1 --- Rat Ratio (AGB+RGB) over HB stars
60- 64 F5.1 % Crc Crowding correction, to be added
to 'Nstar' and 'Ncluster'
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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2- 6 F5.2 --- log(r) log(r/rc), where rc=3 arcmin and r is the
reference radius for the ring
9- 11 I3 --- Nstar Number of stars considered in the ring
15- 19 F5.2 mas/yr Mean radial proper motion in ring
22- 25 F4.2 mas/yr e_ Formal error on <mu_r>
29- 33 F5.2 mas/yr Mean transverse proper motion in ring
36- 39 F4.2 mas/yr e_ Formal error on <mu_t>
44- 47 F4.2 mas/yr sdpmr Standard deviation of radial proper motions
50- 53 F4.2 mas/yr sdpmt Standard deviation of transversal
proper motions
58- 61 F4.2 --- R Ratio (sd{mur}/sd{mut})
64- 67 F4.2 --- e_R Formal error on R
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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3- 6 I4 --- Norr Identifier from Norris et al.,
1997ApJ...487L.187N 1997ApJ...487L.187N (NGC 5139 NNNN)
8- 12 I5 --- LEID Leiden number (current paper)
(Cl* NGC 5139 LEID NNNNN)
15- 18 I4 --- Lyng Identifier from Lynga, 1996A&AS..115..297L 1996A&AS..115..297L
(Cl* NGC 5139 L NNNN in Simbad)
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Acknowledgements: Floor van Leeuwen
History:
* 17-Aug-2000 : tables supplied by Floor van Leeuwen
* 11-Oct-2000 : table3b, ID 56178 (star V#39) changed to 56148
* 20-Oct-2000 : some corrections in table9.dat
References:
Kaluzny et al., 1997A&AS..125..343K 1997A&AS..125..343K
Lynga, 1996A&AS..115..297L 1996A&AS..115..297L
Martin W.C., 1938, Annalen Sterrewacht Leiden, Vol.XVII
Norris et al., 1997ApJ...487L.187N 1997ApJ...487L.187N
Woolley R.v.d.R., 1966, Royal Obs.Annals, No 2
(End) F.van Leeuwen, Institute of Astronomy, Patricia Bauer [CDS] 17-Aug-2000