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J/MNRAS/397/1073
  UBVI photometry in NGC 2587 (Piatti+, 2009)
ReadMe+ftp
2009MNRAS.397.1073P
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1 annotation(s) 		img(gal)
1.J/MNRAS/397/1073/table2Calibrated UBVI data of standard stars (33 rows)

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  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  Name (char) Star name (meta.id;meta.main)
  Vmag mag V magnitude (phot.mag;em.opt.V)
  e_Vmag mag rms uncertainty on Vmag (stat.error;phot.mag;em.opt.V)
  r(V) mag Residual (calibrated standard value) in Vmag (stat.fit.residual)
  U-B mag U-B colour index (phot.color;em.opt.U;em.opt.B)
  e_U-B mag rms uncertainty on U-B (stat.error;phot.color;em.opt.U)
  r(U-B) mag Residual (calibrated standard value) in U-B (stat.fit.residual)
  B-V mag B-V colour index (phot.color;em.opt.B;em.opt.V)
  e_B-V mag rms uncertainty on B-V (stat.error;phot.color;em.opt.B)
  r(B-V) mag Residual (calibrated standard value) in B-V (stat.fit.residual)
  V-I mag V-I colour index (phot.color;em.opt.V;em.opt.I)
  e_V-I mag rms uncertainty on V-I (stat.error;phot.color;em.opt.V)
  r(V-I) mag Residual (calibrated standard value) in V-I (stat.fit.residual)
  SimbadName (char) Designation understandable by the Simbad data-base (meta.id)
  _RA deg (i) Right Ascension (J2000) from SIMBAD (not part of the original data) (pos.eq.ra;meta.main)
  _DE deg (i) Declination (J2000) from SIMBAD (not part of the original data) (pos.eq.dec;meta.main)

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Annotations on J/MNRAS/397/1073
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Posted by bskiff (2011/08/12 19:18:35)
[J/MNRAS/397/1073/table3]
The main data table contains large numbers of pairs
of entries for the same stars. They are separated by ~1"
and have similar but not identical photometry, based on
different images in the dataset, which were obviously not
well linked astrometrically.
Analysis of the results should also take note of the
transformation equations 1 to 5 in the paper, notably the
large (~0.055 mag) zero-point uncertainties, and the
anomalously low V-band extinction coefficient. Such problems
are not uncommon with single-night photometry.

\Brian Skiff
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