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J/other/NewA/17.296       GO Cyg BV light curves                (Ulas+, 2012)
Close binary system GO Cyg.
    Ulas B., Kalomeni B., Keskin V., Kose O., Yakut K.
   <New Astron. 17 296 (2012)>
   =2012NewA...17..296U
ADC_Keywords: Binaries, eclipsing ; Photometry, UBV

Keywords: stars: binaries: eclipsing - stars: binaries: close -
          stars: binaries: general - stars: fundamental parameters -
          stars: low-mass

Abstract:
    In this study, we present long term photometric variations of the
    close binary system GO Cyg. Modelling of the system shows that the
    primary is filling Roche lobe and the secondary of the system is
    almost filling its Roche lobe. The physical parameters of the system
    are M1=3.0±0.2M☉, M2=1.3±0.1M☉,
    R1=2.50±0.12R☉, R2=1.75±0.09R☉,
    L1=64±9L☉, L2=4.9±0.7L☉, and a=5.5±0.3R☉.
    Our results show that GO Cyg is the most massive system near contact
    binary (NCB). Analysis of times of the minima shows a sinusoidal
    variation with a period of 92.3±0.5-years due to a third body whose
    mass is less than 2.3M☉. Finally a period variation rate of
    -1.4x10-9d/yr has been determined using all available light curves.

Description:
    Photometric variations of the close binary system GO Cyg is presented.
    Physical and orbital parameters of the system are determined. It is
    found that the the system is the most massive among near contact
    binaries.
Objects:
    --------------------------------------------
       RA   (2000)   DE      Designation(s)
    --------------------------------------------
    20 37 20.1   +35 26 10   GO Cyg = V* GO Cyg
    --------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       101       16   Available light curves of GO Cyg that are
                              collected from the literature
table5.dat        34     5417   Available light curves data


See also:
     J/other/NewA/17.46 : VRI light curves of V1191 Cyg (Ulas+, 2012)


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

   Bytes Format Units   Label     Explanations

   1-  4  A4    ---     LC        Light curve designation (1)
   6- 12  A7    ---     Date      Date of observation (Year)
  14- 20  F7.1  d       JD1       ? Time interval (JD-2400000)
      21  A1    ---     ---       [-]
  22- 28  F7.1  d       JD2       ? Time interval (JD-2400000)
  30- 38  A9    ---     Filt      Filters used
  40- 42  A3    ---     Type      Type of observation (pg, pe, ccd)
  44- 77  A34   ---     Comp      Comparison star(s)
  79- 99  A21   ---     Npts      Number of data points be filters
     101  A1    ---     Data      [Y/N] Data availability

Note (1): References for the light curves:
   LC01 = Payne-Gaposchkin (1935, BHarO 898, 3)
   LC02 = Liau (1935, POLyo, 1)
   LC03 = Pierce (1939, AJ 48, 113)
   LC04 = Popper (1957ApJS....3..107P)
   LC05 = Ovenden (1954MNRAS.114..569O)
   LC06 = Mannino (1963MmSAI..34..191M)
   LC07 = Sezer et al. (1993Ap&SS.203..121S)
   LC08 = Rovithis et al.  (1990A&AS...83...41R)
   LC09 = Oprescu et al. (1996RoAJ....6..119O)
   LC10 = Jassur (1997Ap&SS.249..111J)
   LC11 = Rovithis-Livaniou et al. (1997A&A...327.1017R)
   LC12 = Edalati and Atighi (1997Ap&SS.253..107E)
   LC13 = Vukasovic (1997, IAPPP 67, 11)
   LC14 = Oh et al. (2000Ap&SS.271..303K)
   LC15 = Zabihinpoor et al. (2010PASP..122..309Z)
   LC16 = This study


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   1-  4  A4    ---     LC        Light curve designation
       6  A1    ---     Filt      [BV] Filter
   8- 19  F12.4 d       JD        ? Julian date (1)
  21- 27  F7.4  ---     Phase     ? Orbital phase (1)
  29- 34  F6.3  mag     Dmag      Differential magnitude (2)

Note (1): Phases are given for the light curves LC3, LC5, and LC15 since
     JDs are not provided. P0=0.717764585(15)d.
Note (2): Magnitude differences between variable and comparison stars.
     Comparison stars are listed in Table 3.


Acknowledgements:
    Burak Ulas, bulash(at)gmail.com
(End)                   Burak Ulas [EU], Patricia Vannier [CDS]      02-Dec-2011