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 Exploring the SDSS data set. I. EMP & CV stars (Carbon+, 2017)
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1.J/ApJS/228/19/starsCandidate extremely metal-poor (EMP); uncertain EMP or CEMP candidates and cataclysmic variable (CV) stars (tables 1, 2 and 3)[spectrum] (72 rows)

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  Cl (char) EMP: candidate extremely metal-poor star (table 1); Unc: uncertain EMP or carbon-enhanced metal-poor (CEMP) candidate (table 2) or CV: candidate cataclysmic variable star (table 3) (src.class)
  SDSS (char) Star name ( (;meta.main)
  Plate  SDSS plate (meta.note)
  Fiber  SDSS fiber (meta.note)
  MJD d SDSS MJD (time.epoch)
  gmag mag [14.9/21] SDSS g-band magnitude (phot.mag;em.opt.B)
  u-g mag [0.05/1] u-g color index (phot.color;em.opt.U;em.opt.B)
  g-r mag [-0.1/0.4] g-r color index (phot.color;em.opt.B;em.opt.R)
  SCaIIK  (n) [0.1/0.4] S(Ca II K) value (Note 1)   (phot.flux;arith.ratio)
  DCaIIK  (n) [3.2/27.2] D(Ca II K) value (Note 2)   (phot.flux;arith.ratio)

ALL cols
(n) indicates a possible blank or NULL column  
  SH  (n) [0.4/0.7] S(Hε) value (Note 1)   (phot.flux;arith.ratio)
  DH  (n) [16.2/60.2] D(Hε) value (Note 2)   (phot.flux;arith.ratio)
  SCH  (n) [0.01/0.3] S(CH 4308) value (Note 1)   (phot.flux;arith.ratio)
  DCH  (n) [0.2/14.7] D(CH 4308) value (Note 2)   (phot.flux;arith.ratio)
  SpT (char) MK spectral type ("CV" for cataclysmic variable) (src.spType)
  Notes (char) Notes (meta.note)
  f_Notes (char) Flag on Notes (Note 3)   (meta.note)
  Sp  Interactive spectrum from SDSS (meta.ref.url)
  _RA deg Positions from SDSS names (right ascension part) (pos.eq.ra;meta.main)
  _DE deg Positions from SDSS names (declination part) (pos.eq.dec;meta.main)

ALL cols
(n) indicates a possible blank or NULL column  
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