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J/A+A/311/523       Photometry of W UMa (Maceroni+, 1996)
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The properties of W Ursae Majoris contact binaries: new results and old problems
    Maceroni C., van't Veer F.
   <Astron. Astrophys. 311, 523 (1996)>
   =1996A&A...311..523M      (SIMBAD/NED BibCode)
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ADC_Keywords: Binaries, eclipsing ; Magnitudes ; Spectral types ; Reddening
Keywords: binaries: close - star: evolution - stars: mass loss

Abstract:
    The physical properties of W UMa binary systems are revisited on the
    basis of the observational data published in the last decade and of
    the recent theoretical studies on angular-momentum-loss-driven secular
    evolution. The absolute elements (masses, radii, luminosities) are
    derived by an inference method and a calibration based on the
    available high quality spectroscopic orbits. The derived age
    (8Gy) agrees with the estimate of Guinan and Bradstreet from space
    motions. The analysis of the resulting physical parameters shows
    little correlation between the standard classification in A and W
    subtype (first proposed by Binnendijk (1970) and only related to the
    light curve morphology) and the evolutionary status and origin of the
    systems. Most A-subtype systems seem to have no evolutionary link with
    W-subtype ones. The relation between total mass and mass ratio for the
    "bona fide" sample also suggests that mass loss from the system may
    play an important role.

File Summary:
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  FileName  Lrecl  Records   Explanations
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ReadMe         80        .   This file
table1.dat     59       78   Basic observational data of W UMa binaries
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    ---     No        Sequential number (1)
   5- 12  A8    ---     Name      Star name
  15- 20  F6.4  d       Per       Orbital period
  23- 27  F5.2  mag     MaxMag    Maximum magnitude
  30- 34  F5.2  mag     MinMag    Minimum magnitude
      37  A1    ---     MagType   [VPB] Type of magnitudes
  40- 46  A7    ---     Sp        Spectral type(s)
  49- 52  F4.2  mag     B-V       ? B-V color index
  55- 58  F4.2  mag     E(B-V)    ? Reddening
      59  A1    ---   u_E(B-V)    Uncertainty flag on E(B-V)
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Notes (1): Systems denoted by sequential numbers from 1 to 48 are 
      classified as W-subtype, the others as A-subtype (Binnendijk L, 1970, 
      Vistas in Astr. 12, 217). Within each sub-type systems are ordered 
      according to increasing orbital period.
    The values presented derive from the papers on individual systems
    listed in the original paper (Table 2), or from the General Catalogue
    of Variable Stars 4th ed. (Khopolov P.N. et al. 1985, Nauka Publ. Co.,
    Moscow, Catalogue <II/195>) and the Eight Catalogue of the orbital
    elements of spectroscopic binary systems (Batten A.H., Fletcher J.M,
    MacCarthy D.G., 1989 Publ. D.A.O. vol XVII, Catalogue <V/64>).
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Courtesy: Carla Maceroni <maceroni@coma.mporzio.astro.it>
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(End)                                         Patricia Bauer [CDS]   09-Apr-1996