J/AJ/109/1154 JHK Photometry of Liller 1 (Frogel+ 1995)
Infrared Array Photometry of Metal Rich Globular Clusters.
II. Liller 1 -- The Most Metal Rich Cluster?
Frogel J.A., Kuchinski L.E., Tiede G.P.
<Astron. J. 109, 1154 (1995)>
=1995AJ....109.1154F 1995AJ....109.1154F
ADC_Keywords: Photometry, infrared ; Clusters, globular
Abstract:
We present the first color-magnitude diagram of Liller 1, a globular
cluster with an angular separation of only 5 deg from the galactic
center and a latitude of 0.2 deg. We estimate a metallicity for this
cluster of [Fe/H] = +0.25 ± 0.3 based on the slope of Liller 1's
giant branch in the near-infrared. This implies that Liller 1 is the
most metal rich galactic globular cluster known. Any reasonable
uncertainty in the age of the cluster will not affect our method for
deriving the metallicity. We also conclude that for Liller 1 E(J-K) =
1.70 ± 0.06 (or A_V ∼ 9.5) and (m-M)0 = 14.68 ± 0.23. The atypical
JHK colors of the Liller 1 stars, the extreme slope of its giant
branch, and its physical closeness to the galactic center raise the
question of whether it is a normal globular cluster or if its
formation and evolution have been strongly influenced by its proximity
to the galactic center.
Objects:
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RA (2000) DE Designation(s)
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17 33 24.0 -33 23 16 C 1730-333 = Liller 1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 74 799 Liller 1 data
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See also:
J/AJ/109/1131 : NGC 5927, Terzan 2, NGC 6712, NGC 6838 (Kuchinski+ 1995)
(Paper I)
J/AJ/110/2844 : M 71, NGC 5927, NGC 6624, NGC 6440, NGC 6712 (Kuchinski+ 1995)
(Paper III)
J/AJ/121/3114 : UBVR photometry of NGC 6712 with VLT (Paltrinieri+, 2001)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID ID number
5-16 F12.1 pix Xpos X coordinate on frame
17-28 F12.1 pix Ypos Y coordinate on frame
29-38 F10.3 mag Kmag Observed K magnitude
39-47 F9.3 mag J-K Observed J-K color
48-56 F9.3 mag H-K Observed H-K color
57-62 A6 --- Ring *Ring designation
63-68 A6 --- Code *Code for data set
69-74 A6 --- Note Notes, NO = DoPHOT error > 0.06 mag
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Note on Ring:
Cluster Center at x=80, y=5 (pixels), scale = 0.52 arcsec/pixel
I = R < 40 pixels (21 arcsec) from cluster center
II = 40 pixels (21 arcsec) < R < 60 pixels (31 arcsec)
III = 60 pixels (31 arcsec) < R < 110 pixels (57 arcsec)
IV = R > 110 pixels (57 arcsec)
Note on Code:
3 = 3sec exposure, 10 = 10sec exposure
A3 = 3sec good seeing exposure, AL = good seeing, long exposure
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Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 03-May-1995
(End) [CDS] 11-Jul-1995