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J/A+A/543/A106      UBVRI photometry in NGC6791              (Brogaard+, 2012)
Age and helium content of the open cluster NGC6791 from multiple eclipsing
binary members.
II. Age dependencies and new insights.
    Brogaard K., VandenBerg D.A., Bruntt H., Grundahl F., Frandsen S.,
    Bedin L.R., Milone A.P., Dotter A., Feiden G.A., Stetson P.B., Sandquist E.,
    Miglio A., Stello D., Jessen-Hansen J.
    <Astron. Astrophys. 543, A106 (2012)>
    =2012A&A...543A.106B        (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI

Keywords: open clusters and association: individual NGC 6791 -
          stars: evolution - binaries: eclipsing - stars: abundances -
          techniques: photometric - techniques: spectroscopic

Abstract:
    We present a new reduction of optical photometry for the open cluster
    NGC6791.

Description:
    New reduction of photometric B, V, I observations from Stetson et al.
    (2003, Cat. J/PASP/115/413) with updated photometry zero-points
    according to Stetson et al. (2005PASP..117..563S), and the same
    photometry, but empirically corrected for differential reddening using
    the procedure described in Milone et al. (2012A&A...540A..16M).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
photom.dat       200    15395   B, V, I photometry and photometry corrected
                                 empirically for differential reddening


See also:
   J/PASP/115/413 : BVI photometry in the open cluster NGC 6791 (Stetson+, 2003)
   J/A+A/525/A2   : Eclipsing binaries in NGC6791 (Brogaard+, 2011)


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

   Bytes Format Units   Label     Explanations

   1-  5  I5    ---     ID        ID number
   7- 14  F8.3  ---     Xpos      X-position in reference image
  16- 23  F8.3  ---     Ypos      Y-position in reference image
  25- 30  F6.3  mag     Vmag      V-magnitude
  32- 37  F6.4  mag     e_Vmag    1-sigma uncertainty on V-magnitude
  39- 44  F6.3  mag     Bmag      ?=99.999 B-magnitude
  46- 51  F6.4  mag     e_Bmag    ?=9.999 1-sigma uncertainty on B-magnitude
  53- 58  F6.3  mag     Imag      ?=99.999 I-magnitude
  60- 65  F6.4  mag     e_Imag    ?=9.999 1-sigma uncertainty on I-magnitude
  67- 72  F6.3  mag     Rmag      ?=99.999 R-magnitude
  74- 79  F6.4  mag     e_Rmag    ?=9.999 1-sigma uncertainty on R-magnitude
  81- 86  F6.3  mag     Umag      ?=99.999 U-magnitude
  88- 93  F6.4  mag     e_Umag    ?=9.999 1-sigma uncertainty on U-magnitude
  95- 97  I3    ---     o_Vmag    Number of individual V-measurements
  99-100  I2    ---     o_Bmag    Number of individual B-measurements
 102-104  I3    ---     o_Imag    Number of individual I-measurements
     106  I1    ---     o_Rmag    Number of individual R-measurements
     108  I1    ---     o_Umag    Number of individual U-measurements
 110-115  F6.3  ---     chi       chi quality measure
 117-122  F6.3  ---     Sharp     sharp quality measure
 124-129  F6.3  ---     W/S       W/S variabillity index
 131-135  F5.1  ---     w_W/S     Weight of W/S variabillity index
 137-143  F7.4  ---     W/Se      ?=-9.9999 Evidence for variabillity index
                                             log(index*wt)
 145-146  I2    h       RAh       Right ascension (J2000.0)
 148-149  I2    min     RAm       Right ascension (J2000.0)
 151-155  F5.2  s       RAs       Right ascension (J2000.0)
     157  A1    ---     DE-       Declination sign (J2000.0)
 158-159  I2    deg     DEd       Declination (J2000.0)
 161-162  I2    arcmin  DEm       Declination (J2000.0)
 164-167  F4.1  arcsec  DEs       Declination (J2000.0)
 169-176  F8.4  mag     Bmagc     ?=-9.9999 Corrected B-magnitude
 178-184  F7.4  mag     Vmagc     ?=-9.9999 Corrected V-magnitude
 186-192  F7.4  mag     Imagc     ?=-9.9999 Corrected I-magnitude
 194-200  F7.4  mag     difred    ?=-9.9999 Relative reddening correction
                                             Delta_E(B-V)


Acknowledgements:
          Karsten Brogaard, kfb(at)phys.au.dk

References:
   Brogaard et al., Paper I     2011A&A...525A...2B, Cat. J/A+A/525/A2
(End)      Karsten Brogaard [UVic, Canada], Patricia Vannier [CDS]   22-Jun-2012