CDROM/AJ/V109/P1154 Liller 1 (Frogel+ 1995) ================================================================================ Infrared Array Photometry of Metal Rich Globular Clusters. II. Liller 1 -- The Most Metal Rich Cluster? Jay A. Frogel, Leslie E. Kuchinski, Glenn P. Tiede <1995, AJ, 109, 1154> =1995AJ....109.1154F ================================================================================ 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. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table3.dat 74 799 Liller 1 data -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- ID ID number 5-16 F12.1 pix X X coordinate on frame 17-28 F12.1 pix Y Y coordinate on frame 29-38 F10.3 mag K 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 -------------------------------------------------------------------------------- Notes for file: table3.dat -------------------------------------------------------------------------------- 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) Code: 3 = 3sec exposure, 10 = 10sec exposure A3 = 3sec good seeing exposure, AL = good seeing, long exposure -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 03-May-1995