J/AJ/124/1651  Faint high-latitude carbon stars SDSS photometry  (Margon+, 2002)
================================================================================
Faint high-latitude carbon stars discovered by the Sloan Digital Sky Survey:
methods and initial results.
    Margon B., Anderson S.F., Harris H.C., Strauss M.A., Knapp G.R., Fan X.,
    Schneider D.P., Vanden Berk D.E., Schlegel D.J., Deutsch E.W., Ivezic Z.,
    Hall P.B., Williams B.F., Davidsen A.F., Brinkmann J., Csabai I.,
    Hayes J.J.E., Hennessy G., Kinney E.K., Kleinman S.J., Lamb D.Q., Long D.,
    Neilsen E.H., Nichol R., Nitta A., Snedden S.A., York D.G.
   <Astron. J. 124, 1651 (2002)>
   =2002AJ....124.1651M
================================================================================
ADC_Keywords: Stars, carbon ; Stars, faint ; Photometry, SDSS ;
              Photometry, infrared
Keywords: astrometry - stars: carbon - stars: statistics - surveys

Abstract:
    We report the discovery of 39 faint high-latitude carbon stars (FHLCs)
    from Sloan Digital Sky Survey (SDSS) commissioning data. The objects,
    each selected photometrically and verified spectroscopically, range
    over 16.6<r*<20.0 and show a diversity of temperatures as judged
    by both colors and NaD line strengths. Although a handful of these
    stars were previously known, these objects are, in general, too faint
    and too warm to be effectively identified in other modern surveys such
    as the Two Micron All Sky Survey, nor are their red/near-IR colors
    particularly distinctive. We present proper-motion measures for each
    object, indicating that the sample is a mixture of extremely distant
    (greater than 100kpc) halo giant stars, useful for constraining halo
    dynamics, and members of the recently recognized exotic class of very
    nearby dwarf carbon (dC) stars.

File Summary:
--------------------------------------------------------------------------------
 FileName   Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe         80        .   This file
table1.dat     68       39   Faint high-latitude carbon stars discovered in
                              SDSS commissioning data
table2.dat     74       17   SDSS faint high-latitude carbon stars in
                              released 2MASS fields
--------------------------------------------------------------------------------

See also:
   II/246 : The 2MASS database (IPAC/UMass, 2000)

Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
   Bytes Format Units     Label     Explanations
--------------------------------------------------------------------------------
   1- 16  A16   ---       SDSS      SDSS designation
  18- 22  F5.2  mag       r*mag     SDSS r* magnitude
  24- 27  F4.2  mag       u*-g*     SDSS u*-g* colour index
  29- 32  F4.2  mag       g*-r*     SDSS g*-r* colour index
  34- 37  F4.2  mag       r*-i*     SDSS r*-i* colour index
  39- 43  F5.2  mag       i*-z*     SDSS i*-z* colour index
  45- 47  I3    mas/yr    pm        ? Proper motion
  49- 50  I2    mas/yr  e_pm        ? rms uncertainty on pm
  52- 54  I3    deg       PA        ? Position angle
  56- 61  F6.1  km/s      HRV       ? Heliocentric radial velocity
  63- 66  F4.1  km/s    e_HRV       ? rms uncertainty on HRV
      68  A1    ---     n_SDSS      [b-d] Individual notes (1)
--------------------------------------------------------------------------------
Note (1): Notes are coded as follows:
    b: Two separate observations exist; the weighted average RV is quoted
    c: ARC 3.5m spectrum only; no RV data is available
    d: The object is very faint; there is no suitable first-epoch data
       for quantitative proper-motion analysis, although informal
       indications are that any motion must be small
--------------------------------------------------------------------------------

Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 16  A16   ---     SDSS      SDSS designation
      17  A1    ---   n_SDSS      [c] Note on SDSS (2)
  19- 33  A15   ---     2MASS     2MASS designation (1)
      34  A1    ---   n_2MASS     [b] Note on 2MASS (2)
  36- 40  F5.2  mag     z*mag     SDSS z* magnitude
  42- 46  F5.2  mag     Jmag      ? 2MASS J Magnitude
  48- 51  F4.2  mag   e_Jmag      ? rms uncertainty on Jmag
  53- 57  F5.2  mag     Hmag      ? 2MASS H magnitude
  59- 62  F4.2  mag   e_Hmag      ? rms uncertainty on Hmag
      64  A1    ---   l_Kmag      Limit flag on Kmag
  65- 69  F5.2  mag     Kmag      ? 2MASS K magnitude
  71- 74  F4.2  mag   e_Kmag      ? rms uncertainty on Kmag
--------------------------------------------------------------------------------
Note (1): Blank entry indicates object lies within 2MASS survey area, 
     but was not detected by 2MASS.
Note (2): Individual notes:
    b: Faintly visible on sky GIF images, but not catalogued by 2MASS.
    c: Not part of autonomously selected sample, but included here for
       completeness; see Sect. 2.2.2 of the paper.
--------------------------------------------------------------------------------

History:
    From electronic version of the journal
================================================================================
(End)                         James Marcout, Patricia Bauer [CDS]    08-Nov-2002