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J/MNRAS/420/1115       UV-excess sources from UVEX            (Verbeek+, 2012)
A first catalogue of automatically selected ultraviolet-excess sources from the
UVEX survey.
    Verbeek K., De Groot E., Groot P.J., Scaringi S., Drew J., Greimel R.,
    Irwin M., Gonzalez-Solares E., Gansicke B.T., Casares J.,
    Corral-Santana J.M., Deacon N., Steeghs D.
   <Mon. Not. R. Astron. Soc., 420, 1115-1134 (2012)>
   =2012MNRAS.420.1115V
ADC_Keywords: Galaxy catalogs ; Ultraviolet ; Photometry

Keywords: surveys - stars: general - ISM: general - Galaxy: disc -
          Galaxy: stellar content - Galaxy: structure

Abstract:
    We present the first catalogue of point-source ultraviolet (UV)-excess
    sources selected from the UV-Excess Survey of the Northern Galactic
    Plane (UVEX). UVEX images the Northern Galactic Plane in the U, g, r
    and HeIλ5875 bands in the Galactic latitude range -5<b<+5°.
    Through an automated algorithm, which works on a field-to-field basis,
    we select blue UV-excess sources in 211 square degrees from the (U-g)
    versus (g-r) colour-colour diagram and the g versus (U-g) and g versus
    (g-r) colour-magnitude diagrams. The UV-excess catalogue covers the
    magnitude range 14<g<22.5, contains 2170 sources and consists of a mix
    of white dwarfs, post-common-envelope objects, interacting binaries,
    quasars and active galactic nuclei. Two other samples of outliers were
    found during the selection: (i) a "subdwarf" sample, consisting of no
    less than 9872 candidate metal-poor stars or lightly reddened
    main-sequence stars, and (ii) a "purple" sample consisting of 803
    objects, most likely a mix of reddened late M giants, T Tauri stars,
    planetary nebulae, symbiotic stars and carbon stars. Cross-matching
    the selected UV-excess catalogue with other catalogues aids with the
    first classification of the different populations and shows that more
    than 99 per cent of our selected sources are unidentified sources.

Description:
    UVEX is a double-pass survey in the Johsnon-U, Sloan-g, Sloan-r
    filters, and a narrow-band filter centered on the HeI5875Å line.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
purple.dat       268      803   'purple' sample: sources blue in (U-g)
                              and red in (g-r)
subdwarf.dat     268     9872   'subdwarf' sample
uvexcess.dat     268     2170   'UV-excess' catalog


See also:
   http://www.astro.ru.nl/uvex/ : the UVEX Home Page
   J/MNRAS/399/323 : Simulated UVEX colors with reddening (Groot+, 2009)


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

   Bytes Format Units  Label   Explanations

   1-  2  I2    h      RAh     Right ascension (J2000)
   4-  5  I2    min    RAm     Right ascension (J2000)
   7- 11  F5.2  s      RAs     Right ascension (J2000)
      13  A1    ---    DE-     Declination sign (J2000)
  14- 15  I2    deg    DEd     Declination (J2000)
  17- 18  I2    arcmin DEm     Declination (J2000)
  20- 24  F5.2  arcsec DEs     Declination (J2000)
  26- 29  I4    ---    UVEX    UVEX field
  31- 36  F6.3  mag    rmag    Average r magnitude
  38- 42  F5.3  mag    e_rmag  rms uncertainty in rmag
  44- 45  I2    ---    MCr     [-2/0] Morphology class from r magnitude (1)
  47- 52  F6.3  mag    gmag    Average g magnitude
  54- 58  F5.3  mag    e_gmag  rms uncertainty in gmag
  60- 61  I2    ---    MCg     [-2/0] Morphology class from g magnitude (1)
  63- 68  F6.3  mag    Umag    Average U magnitude
  70- 74  F5.3  mag    e_Umag  rms uncertainty in Umag
  76- 77  I2    --     MCU     [-2/0] Morphology class from U magnitude (1)
  79- 84  F6.3  mag    Hemag   Average He magnitude (HeI filter at 5875Å)
  86- 90  F5.3  mag   e_Hemag  rms uncertainty in Hemag
  92- 93  I2    ---    MCHe    [-8/1] Morphology class from He magnitude (1)
  95- 98  I4    ----   fUVEX   UVEX selection flag (2)
 100-104  F5.2  mag    ind1    (U-g)_BlueEdge_-(U-g)_source_-2σ(U-g) (3)
 106-110  F5.2  mag    ind2    (g-r)_BlueEdge_-(g-r)_source_- 2σ(g-r) (4)
 112-117  F6.3  mag    rmag0   Original r magnitude for direct field
 119-123  F5.3  mag   e_rmag0  rms uncertainty on rmag
 125-126  I2    ---    MC0r    [-2/0] Direct field r-band morphologic class (1)
 128-133  F6.3  mag    gmag0   Original g magnitude for direct field
 135-139  F5.3  mag   e_gmag0  rms uncertainty on gmag
 141-142  I2    ---    MC0g    [-2/0] Direct field g-band morphologic class (1)
 144-149  F6.3  mag    Umag0   Original U magnitude for direct field
 151-155  F5.3  mag   e_Umag0  rms uncertainty on Umag
 157-158  I2    ---    MC0U    [-2/1] Direct field U-band morphologic class (1)
 160-165  F6.3  mag    Hemag0  ? Original He magnitude for direct field
 167-171  F5.3  mag  e_Hemag0  ? rms uncertainty on Hemag
 173-174  I2    ---    MC0He   [-8/1] Direct field He-band morphologic class (1)
 176-181  F6.3  mag    rmag2   Original r magnitude for offset field
 183-187  F5.3  mag   e_rmag2  rms uncertainty on rmag
 189-190  I2    ---    MC2r    [-2/0] Offset field r-band morphologic class (1)
 192-197  F6.3  mag    gmag2   Original g magnitude for offset field
 199-203  F5.3  mag   e_gmag2  rms uncertainty on gmag
 205-206  I2    ---    MC2g    [-2/0] Offset field g-band morphologic class (1)
 208-214  F7.3  mag    Umag2   ?=- Original U magnitude for offset field
 216-222  F7.3  mag   e_Umag2  rms uncertainty on Umag
 224-225  I2    ---    MC2U    [-2/0] Offset field U-band morphologic class (1)
 227-233  F7.3  mag    Hemag2  ? Original He magnitude for offset field
 235-241  F7.3  mag  e_Hemag2  ?=- rms uncertainty on Hemag
 243-244  I2    ---    MC2He   [-2/0] Offset field He-band Morphology class (1)
 246-250  F5.2  mag    <e_r>   Average r magnitude error of the total field
 252-256  F5.2  mag    <e_g>   Average g magnitude error of the total field
 258-262  F5.2  mag    <e_U>   Average U magnitude error of the total field
 264-268  F5.2  mag    <e_He>  Average He magnitude error of the total field

Note (1): The possible morphology classes are:
  -1 = stellar
  -2 = probably stellar
   0 = noise-like
   The other values (-8 and 1) are not explained.
Note (2): UVEX selection flag (1, 2, 4, 32, 64, 512, 1024 or combinations) and
          gives information about how the source was selected as follows:
      1 = outlier on the blue side of the main-sequence in the (U-g)
          versus (g-r) colour-colour diagram
      2 = outlier on the blue side of the main sequence in the g
          versus (U-g) colour-magnitude diagram
      4 = outlier on the blue side of the main-sequence in the g
          versus (g-r) colour magnitude diagram
     32 = outlier on the purple side of the main sequence in the (U-g)
          versus (g-r) colour-colour diagram
     64 = outlier on the non-purple side of the main sequence in the (U-g)
          versus (g-r) colour-colour diagram
    512 = outlier on the blue side of the main sequence in the g
          versus (U-g) colour-magnitude diagram that lies more than
          0.4mag away from the main-sequence blue edge
   1024 = outlier on the blue side of the main sequence in the g
          versus (g-r) colour-magnitude diagram that lies more than
          0.4mag away from the main-sequence blue edge
Note (3): the difference in (U-g) between source and the blue edge in the
     g vs. (U-g) cmd, inclusive the photometric error of the source.
Note (4): the difference in (g-r) between source and the blue edge in the
     g vs. (g-r) cmd, inclusive the photometric error of the source.


History:
    Copied at http://www.uvexsurvey.org
(End)                                      Patricia Vannier [CDS]    23-Jul-2012