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J/AJ/118/2894    UBVRI CCD photometry in NGC 188           (Sarajedini+, 1999)
WIYN open cluster study. II. UBVRI CCD photometry of the open cluster NGC 188.
    Sarajedini A., Von Hippel T., Kozhurina-Platais V., Demarque P.
   <Astron. J., 118, 2894-2907 (1999)>
   =1999AJ....118.2894S
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD

Keywords: galaxies: formation - galaxies: star clusters


Abstract:
    We present high-precision UBVRI CCD photometry of the old open cluster
    NGC 188. Our color-magnitude diagram extends from near the red giant
    branch tip to as faint as ∼5mag below the main-sequence turnoff. From
    an analysis of these data along with published photometry for M67, we
    draw the following conclusions: (1) From the UBV two-color diagram, we
    find a reddening of E(B-V)=0.04±0.02 for M67 and E(B-V)=0.09±0.02
    for NGC 188. (2) Based on main-sequence fitting to solar abundance
    isochrones, the distance moduli turn out to be (m-M)v=9.69±0.11 for
    M67 and (m-M)v=11.44±0.08 for NGC 188. (3) The comparison of the
    CMDs to theoretical isochrones indicates that an amount of core
    convective overshoot equivalent to 0.10 of a pressure scale height is
    appropriate for M67, while no overshoot is required to fit the CMD of
    NGC 188. These isochrones suggest that NGC 188 is 3.0±0.7 Gyr older
    than M67. (4) There is a clear indication of mass segregation in both
    M67 and NGC 188, with the most massive stars (M/M☉>1.1) being
    more centrally concentrated than those that are the least massive
    (0.8≥M/M☉>0.65).

Description:
    The observations of NGC 188 were obtained during two separate runs
    (1995-09-13 and 1996-10-21/22) on the 0.9m telescope at Kitt Peak
    National Observatory using the f/7.5 secondary; a 2048x2048 pixel
    Tektronix CCD (T2KA) was used producing an image scale of 0.68"/pix
    and a field of view of 23x23' centered on the cluster.
Objects:
    -------------------------------------------------
       RA  (2000)  DE     Designation(s)
    -------------------------------------------------
    00 48 26    +85 15.3  NGC 188 = Cl Melotte 2
    -------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table.dat         97     1520   UBVRI CCD photometry of NGC 188


See also:
        II/185  : NGC 188 photographic UBV photom. star catalog (Frolov, 1990)
 J/A+A/390/961  : VI photometry in NGC 188 (Andreuzzi+, 2002)
 J/AJ/124/601   : Absolute positions & proper motions in NGC 188 (Platais+ 2002)
 J/AJ/126/2922  : Astrometry and membership in NGC 188 (Platais+, 2003)
 J/PASP/116/1012 : A star catalog for the open cluster NGC 188 (Stetson+, 2004)
 J/A+A/438/291  : X-ray sources in NGC 188 (Gondoin+, 2005)
 J/AJ/131/1565  : UBVI photometry of Berkeley 17 and NGC 188 (Krusberg+, 2006)


Byte-by-byte Description of file: table.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     Seq       Sequential number
   6- 13  F8.3  pix     Xpos      X position
  15- 22  F8.3  pix     Ypos      Y position
  24- 30  F7.4  mag     Imag      ?=99.9999 I magnitude
  32- 37  F6.4  mag     e_Imag    ?=9.9999 rms uncertainty on Imag
  39- 45  F7.4  mag     Rmag      ?=99.9999 R magnitude
  47- 52  F6.4  mag     e_Rmag    ?=9.9999 rms uncertainty on Rmag
  54- 60  F7.4  mag     Vmag      ?=99.9999 V magnitude
  62- 67  F6.4  mag     e_Vmag    ?=9.9999 rms uncertainty on Vmag
  69- 75  F7.4  mag     Bmag      ?=99.9999 B magnitude
  77- 82  F6.4  mag     e_Bmag    ?=9.9999 rms uncertainty on Bmag
  84- 90  F7.4  mag     Umag      ?=99.9999 U magnitude
  92- 97  F6.4  mag     e_Umag    ?=9.9999 rms uncertainty on Umag


History:
   Copied at WEBDA, http://www.univie.ac.at/webda/archive_ngc.html/

References:
 von Hippel & Sarajedini,   Pap. I       1998AJ....116.1789V
 Sarajedini,                Pap. III     1999AJ....118.2321S
 Sarajedini et al.,         Pap. IV      1999AJ....118.2894S
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 von Hippel et al.,         Pap. XI      2002AJ....124.1555V
 Kafka & Honeycutt,         Pap. XV      2003AJ....126..276K
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(End)                                      Patricia Vannier [CDS]    22-Jan-2008