J/other/RAA/18.126 Membership catalog for M12 (NGC6218) stars (Sariya+, 2018)
A proper motion study of the globular cluster M12 (NGC 6218).
Sariya D.P., Jiang I.-G., Yadav R.
<Res. Astron. Astrophys., 18, 126 (2018)>
=2018RAA....18..126S 2018RAA....18..126S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Proper motions ; Photometry, UBVRI
Keywords: Galaxy: globular clusters - astrometry - catalogs - individual: M12
Abstract:
Using astrometric techniques developed by Anderson et al., we
determine proper motions (PMs) in the ∼14.60x16.53arcmin2 area of
the kinematically "thick-disk" globular cluster M12. The cluster's
proximity and sparse nature makes it a suitable target for
ground-based telescopes. Archive images with time gap of ∼11.1-years
were observed with the wide-field imager (WFI) mosaic camera mounted
on the ESO 2.2m telescope. The median value of PM error in both
components is ∼0.7mas/yr for the stars having V≤20mag. PMs
are used to determine membership probabilities and to separate field
stars from the cluster sample. In electronic form, a membership
catalog of 3725 stars with precise coordinates, PMs and BV RI
photometry is being provided. One of the possible applications of the
catalog is demonstrated by gathering the membership information of the
variable stars, blue stragglers and X-ray sources reported earlier in
the cluster's region.
Description:
The M12 images used in this research are taken from the European
Southern Observatory (ESO) archive. These data are observed with the
2.2m ESO/MPI telescope at La Silla, Chile. This telescope contains a
mosaic camera with a combination of eight EEV CCDs, each having the
dimension of 2kx4k pixels. The images employed in this study were
obtained between 1999 May 14 and 2010 June 6, thus providing an epoch
gap of ∼11.1 years.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 145 3725 Membership catalog for M12
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See also:
J/ApJ/608/243 : CCD BVI photometry of M12 stars (Hargis+, 2004)
J/A+A/464/939 : Abundances of red giants in NGC 6218 (Carretta+, 2007)
J/AcA/62/357 : Proper motions in 6 globular clusters (Zloczewski+, 2012)
J/ApJ/791/39 : NGC 6218 and NGC 5904 lithium abundances (D'Orazi+, 2014)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [1/3725] Sequential Number
6- 7 I2 h RAh Right ascension (J2000)
9- 10 I2 min RAm Right ascension (J2000)
12- 16 F5.2 s RAs Right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19 I1 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 27 F4.1 arcsec DEs Declination (J2000)
29- 37 F9.4 pix Xpos X position
38- 46 F9.4 pix Ypos Y position
48- 55 F8.4 mas/yr pmRA Proper motion along right ascension
(pmRA*cosDE)
57- 62 F6.4 mas/yr e_pmRA rms uncertainty on pmRA
64- 71 F8.4 mas/yr pmDE Proper motion along declination
73- 78 F6.4 mas/yr e_pmDE rms uncertainty on pmDE
80- 86 F7.4 mag Bmag Johnson B magnitude
88- 93 F6.4 mag e_Bmag rms uncertainty on Bmag
95-101 F7.4 mag Vmag Johnson V magnitude
103-108 F6.4 mag e_Vmag rms uncertainty on Vmag
110-116 F7.4 mag Rcmag ?=99.9999 Cousins R magnitude
118-123 F6.4 mag e_Rcmag ?=0.9999 rms uncertainty on Rcmag
125-131 F7.4 mag Icmag Cousins I magnitude
133-138 F6.4 mag e_Icmag rms uncertainty on Icmag
140-145 F6.2 % PMemb Proper-motion membership probability
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Aug-2019