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J/MNRAS/382/1377    SDSS WD main-sequence binaries    (Rebassa-Mansergas+, 2007)
Post-common-envelope binaries from SDSS.
I. 101 white dwarf main-sequence binaries with multiple
Sloan Digital Sky Survey spectroscopy.
    Rebassa-Mansergas A., Gansicke B.T., Rodriguez-Gil P., Schreiber M.R.,
    Koester D.
   <Mon. Not. R. Astron. Soc., 382, 1377-1393 (2007)>
   =2007MNRAS.382.1377R
ADC_Keywords: Stars, double and multiple ; Stars, dwarfs ; Stars, white dwarf

Keywords: accretion, accretion discs - binaries: close -
          novae, cataclysmic variables

Abstract:
    We present a detailed analysis of 101 white dwarf main-sequence
    binaries (WDMS) from the Sloan Digital Sky Survey (SDSS) for which
    multiple SDSS spectra are available.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        62      261   WD-MS in our sample that did not show a significant
                             RV variation between their different SDSS spectra
                             (123 stars)
table3.dat       105      258   WD masses, effective temperatures, surface
                             gravities, spectral types and distances (112 stars)


See also:
  J/AJ/129/2428 : M dwarf-white dwarf binary systems (Silvestri+, 2005)
  J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)
         II/282 : SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
    http://www.sdss.org/ : SDSS Home Page


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  4  A4    ---     ---       [SDSS]
   5- 23  A19   ---     SDSS      SDSS designation (JHHMMSS.ss+DDMMSS.s) of WD
  25- 36  F12.4 d       HJD       Heliocentric Julian Date of the spectrum
      38  A1    ---     f_SDSS    [y/n] composed spectrum (1)
  40- 45  F6.1  km/s    RV(Na)    ? NaI (8183.27,8194.81) absorption double
                                    radial velocity
  47- 50  F4.1  km/s    e_RV(Na)  ? rms uncertainty on RV(Na)
  52- 57  F6.1  km/s    RV(Ha)    ? Hα emission radial velocity
  59- 62  F4.1  km/s    e_RV(Ha)  ? rms uncertainty on RV(Ha)

Note (1): yes (y) or no (n) those spectra which are composed of subspectra
     taken in different nights


Byte-by-byte Description of file: table3.dat

   Bytes Format Units     Label    Explanations

   1-  4  A4    ---       ---      [SDSS]
   5- 23  A19   ---       SDSS     SDSS designation (JHHMMSS.ss+DDMMSS.s)
  25- 29  I5    ---       MJD      SDSS MJD value
  31- 34  I4    ---       Plate    SDSS Plate value
  36- 39  I4    ---       Fiber    SDSS Fiber value
  41- 45  I5    K         Teff     ?=- Wide dwarf effective temperature
  47- 51  I5    K         e_Teff   ?=- rms uncertainty on Teff
  53- 56  F4.2  ---       logg     ?=- Wide dwarf surface gravity
  58- 61  F4.2  ---       e_logg   ?=- rms uncertainty on logg
  63- 66  F4.2  solMass   Mass     ?=- Wide dwarf mass
  68- 71  F4.2  solMass   e_Mass   ?=- rms uncertainty on Mass
  73- 76  I4    pc        Dist     ?=- Distance to the wide dwarf
  78- 81  I4    pc        e_Dist   ?=- rms uncertainty on Dist
  83- 84  A2    ---       Sp2      ?=- MK spectral type of the secondary star
  86- 89  I4    pc        Dist2    ?=- Distance to the secondary star
  91- 93  I3    pc        e_Dist2  ?=- rms uncertainty on Distsec
  95-101  A7    ---       n_SDSS   System already studied or resolved (1)
 103-105  A3    ---       Notes    Individual Notes (2)

Note (1): Flags as follows:
      e = systems which have been studied previously by
          Eisenstein et al (2006, Cat. J/ApJS/167/40)
      s = systems which have been studied previously by
          Silvestri et al. (2006, Cat. J/AJ/131/1674)
     re = systems whose binary components are resolved in their SDSS images
Note (2): Notes as follows:
      1 = Probably K secondary star
      2 = Some blue excess, WD?
      3 = Teff less than 6000k
      4 = DC white dwarf
      5 = magnetic WD? No clear evidence for secondary star
      6 = Chance superposition of an  M and a G stars. No WD
      7 = Blue star close to a very bright red star in the SDSS image.
          Bad background/scattered light subtraction?
      8 = Diffuse Halpha emission in the sky area (Eridanus shell),
          no clear evidence for secondary star
      9 = DO white dwarf
     10 = Extended emission
     11 = Blue flux differ by a factor two between the spectra
     12 = Blue flux differ by a factor five. Eclipsing? Calibration problems?
     13 = Something wrong in the SDSS image on cas.sdss.org: too many
          apparently blue objects that have faint u magnitudes
     14 = Resolved binary, fit depends on the fiber placement
     15 = Single WD
     16 = At least one broken spectrum


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    02-Feb-2009