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 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:
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RA (2000) DE Designation(s)
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00 48 26 +85 15.3 NGC 188 = Cl Melotte 2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 97 1520 UBVRI CCD photometry of NGC 188
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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
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Bytes Format Units Label Explanations
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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
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History:
Copied at WEBDA, http://www.univie.ac.at/webda/archive_ngc.html/
References:
von Hippel & Sarajedini, Pap. I 1998AJ....116.1789V 1998AJ....116.1789V
Sarajedini, Pap. III 1999AJ....118.2321S 1999AJ....118.2321S
Sarajedini et al., Pap. IV 1999AJ....118.2894S 1999AJ....118.2894S
Barrado y Navascues et al. Pap. V 2001ApJ...549..452B 2001ApJ...549..452B
Sills & Deliyannis, Pap. VI 2000ApJ...544..944S 2000ApJ...544..944S
Platais et al., Pap. VII 2001AJ....122.1486P 2001AJ....122.1486P, Cat. J/AJ/122/1486
Platais et al., Pap. VIII 2002AJ....124..601P 2002AJ....124..601P, Cat. J/AJ/124/601
Grocholski & Sarajedini, Pap. X 2002AJ....123.1603G 2002AJ....123.1603G
von Hippel et al., Pap. XI 2002AJ....124.1555V 2002AJ....124.1555V
Kafka & Honeycutt, Pap. XV 2003AJ....126..276K 2003AJ....126..276K
Grocholski & Sarajedini, Pap. XVI 2003MNRAS.345.1015G 2003MNRAS.345.1015G
Platais et al., Pap. XVII 2003AJ....126.2922P 2003AJ....126.2922P, Cat. J/AJ/126/2922
Mathieu et al., Pap. XVIII 2004ApJ...602L.121M 2004ApJ...602L.121M
Sarajedini et al., Pap. XIX 2004AJ....127..991S 2004AJ....127..991S
Kafka et al., Pap. XX 2004AJ....127.1622K 2004AJ....127.1622K
Hole et al., Pap. XXIV 2009AJ....138..159H 2009AJ....138..159H, Cat. J/AJ/138/159
Platais et al., Pap. XXVI 2007A&A...461..509P 2007A&A...461..509P, Cat. J/A+A/461/509
Geller et al., Pap. XXXII 2008AJ....135.2264G 2008AJ....135.2264G, Cat. J/AJ/135/2264
Geller et al., Pap. XXXVI 2009AJ....137.3743G 2009AJ....137.3743G, Cat. J/AJ/137/3743
Geller et al., Pap. XXXVIII 2010AJ....139.1383G 2010AJ....139.1383G, Cat. J/AJ/139/1383
Anthony-Twarog et al., Pap. XXXIX 2010AJ....139.2034A 2010AJ....139.2034A, Cat. J/AJ/139/2034
Geller et al., Pap. XLVIII 2012AJ....144...54G 2012AJ....144...54G
(End) Patricia Vannier [CDS] 22-Jan-2008