J/A+A/493/959 UBV(RI)cHalpha photometry in omega Cen (Bellini+, 2009)
Ground-based CCD astrometry with wide field imagers.
III. proper-motion catalog of the globular cluster omega Centauri.
Bellini A., Piotto G., Bedin L.R., Anderson J., Platais I., Momany Y.,
Moretti A., Milone A.P., Ortolani S.
<Astron. Astrophys. 493, 959 (2009)>
=2009A&A...493..959B 2009A&A...493..959B
ADC_Keywords: Clusters, globular ; Photometry, UBVRI ; Proper motions
Keywords: catalogs - astrometry - Galaxy: globular clusters: general -
Galaxy: globular clusters: individual (omega Cen) -
stars: Populations II -
stars: Hertzprung-Russell (HR) and C-M diagrams
Abstract:
omega Centauri is the most well studied Galactic Globular Cluster
because of its numerous puzzling features: significant dispersion in
metallicity, multiple populations, triple main-sequence, horizontal
branch morphology, He-rich population(s), and extended star-formation
history. Intensive spectroscopic follow-up observing campaigns
targeting stars at different positions in the color-magnitude
diagram promises to clarify some of these peculiarities.
To be able to target cluster members reliably during spectroscopic
surveys and both spatial and radial distributions in the cluster
outskirts without including field stars, a high quality proper-motion
catalog of omega Cen and membership probability determination are
required. The only available wide field proper-motion catalog of omega
Cen is derived from photographic plates, and only for stars brighter
than B∼16. Using ESO archive data, we create a new, CCD-based,
proper-motion catalog for this cluster, extending to B∼20.
We used high precision astrometric software developed specifically for
data acquired by WFI@2.2m telescope and presented in the first paper
of this series.
Description:
Wide-field (∼33'x33') proper motion catalog for nearly 360000 stars
centered around Omega Cen center. Calibrated and sky concentration
corrected UBVRCIC wide-band photometry plus a narrow-band filter
centered on Halpha. Membership probability determination with two
different, complementary methods.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 164 359391 Astrometric and photometric parameters for
359391 objects (table6 of the paper)
table3.dat 16 343 Membership probability for the Kaluzny et al.
(2004, Cat. J/A+A/424/1101) variable star catalog
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See also:
J/AJ/108/1350 : Omega Cen FUV photometry (Whitney+, 1994)
J/PASP/106/828 : BVRI photometry of Omega Cen (Walker 1994)
J/A+AS/115/297 : BVRI photometry of Central Field of Omega Cen (Lynga+, 1996)
J/AJ/119/1225 : Stroemgren photometry of Omega Cen & NGC 6397 (Hughes+, 2000)
J/A+A/400/521 : Omega Cen XMM observations (Gendre+, 2003)
J/AJ/127/958 : CCD BV photometry on Omega Cen (Rey+, 2004)
J/A+A/424/1101 : Variable Stars in the field of ω Cen (Kaluzny+, 2004)
J/A+A/445/503 : Radial velocities in Omega Cen (NGC 5139) (Reijns+, 2006)
J/AJ/135/1395 : omega Cen Spitzer photometry (Boyer+, 2008)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Seq [1/376478] Star sequential number
8- 17 F10.6 deg RAdeg Right ascension (J2000, Epoch J2003.29)
19- 28 F10.6 deg DEdeg Declination (J2000, Epoch J2003.29)
30- 37 F8.3 pix Xpos X master frame position (distortion free)
39- 46 F8.3 pix Ypos Y master frame position (distortion free)
48- 53 F6.2 mas/yr pmRA Proper motion along RA, pmRAcosDE
55- 59 F5.2 mas/yr e_pmRA Proper motion rms along pmRAcosDE
61- 66 F6.2 mas/yr pmDE Proper motion along pmDE
68- 72 F5.2 mas/yr e_pmDE Proper motion rms along pmDE
74- 79 F6.3 mag Umag ?=99.999 Johnson U visual magnitude (1)
81- 86 F6.3 mag e_Umag ?=99.999 Johnson U visual magnitude rms (1)
88- 93 F6.3 mag Bmag ?=99.999 Johnson B visual magnitude (1)
95-100 F6.3 mag e_Bmag ?=99.999 Johnson B visual magnitude rms (1)
102-107 F6.3 mag Vmag ?=99.999 Johnson V visual magnitude (1)
109-114 F6.3 mag e_Vmag ?=99.999 Johnson V visual magnitude rms (1)
116-121 F6.3 mag Rcmag ?=99.999 Cousins R visual magnitude (1)
123-128 F6.3 mag e_Rcmag ?=99.999 Cousins R visual magnitude rms (1)
130-135 F6.3 mag Icmag ?=99.999 Cousins I visual magnitude (1)
137-142 F6.3 mag e_Icmag ?=99.999 Cousins I visual magnitude rms (1)
144-149 F6.3 mag Ha ?=99.999 Halpha visual magnitude (1)
151-156 F6.3 mag e_Ha ?=99.999 Halpha visual magnitude rms (1)
158-160 I3 % Mm Membership probability
162-164 I3 % Mm2 ?=-1 Membership probability alternative (2)
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Note (1): If an object is not been measured in a filter, a flag equal to
99.999 is set for magnitude value and relative magnitude rms.
Note (2): Membership probability determination with an alternative method
for 120227 objects. A value of -1 is set for undetermined memberships.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- VName Variable name (VNNN or NVNNN)
7- 9 I3 % Mmb Membership probability
11- 16 I6 --- Seq Star sequential number
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Acknowledgements:
Andrea Bellini, bellini(at)ustsci.edu
History:
* 22-Jan-2009: Original version
* 09-Mar-2009: table3 added (from Andrea Bellini)
* 30-Mar-2011: corrected version of table3 (from Andrea Bellini)
(End) Patricia Vannier [CDS] 22-Jan-2009