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J/other/NewA/17.46        BVR light curves of V1191 Cyg            (Ulas+, 2012)
Marginally low mass ratio close binary system V1191 Cyg.
    Ulas B., Kalomeni B., Keskin V., Kose O., Yakut K.
   <New Astron. 17, 46 (2012)>
   =2012NewA...17...46U
ADC_Keywords: Binaries, eclipsing ; Stars, variable ; Stars, late-type ;
              Photometry, VRI
Keywords: stars: binaries: eclipsing - stars: binaries: close -
          stars: individual: V1191 Cyg - stars: fundamental parameters

Abstract:
    We present the analysis of photometric and spectroscopic variation,
    and orbital period study of the late-type contact binary system
    V1191 Cyg. The system is found to be a contact binary system having
    strange configuration with very small mass ratio and short orbital
    period comparing with the other members of the same group. We
    determined a new set of stellar physical parameters for hot and cooler
    companion as Mh=0.13(1)M☉, Mc=1.29(8)M☉,
    Rh=0.52(15)R☉, Rc=1.31(18)R☉, Lh=0.46(25)L☉,
    Lc=2.71(80)L☉, and the separation between the components
    a=2.20(8)R☉ from the simultaneous solution of the light and
    radial velocity curves. Analyses of the mid-eclipses time of the
    system indicate a period increase of dP/dt=1.3(1)x10-6days/yr that
    can be interpreted in terms of the high mass transfer
    dM/dt=2.0(4)x10-7M☉/yr from the less massive component to the
    more massive one.

Description:
    Photometric analysis of the contact binary V1191 Cyg is presented.
    Physical and orbital parameters of the system are determined. It is
    found that the the system has very small mass ratio and short orbital
    period. Results of the period analysis prove an external third body.
Objects:
    --------------------------------------------------
       RA   (2000)   DE      Designation(s)
    --------------------------------------------------
    20 16 50.8   +41 57 41   V1191 Cyg = V* V1191 Cyg
    --------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        27      783   Observational points of V1191 Cyg


See also:
  J/other/NewA/17.296 : GO Cyg BV light curves (Ulas+, 2012)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1- 12  F12.4 d       HJD       Heliocentric Julian date
  14- 18  F5.3  ---     Phase     Orbital phase (1)
  20- 25  F6.3  mag     Dmag      Differential magnitude (2)
      27  A1    ---     Filt      [BVR] Filter

Note (1): Calculated using the Eq. (1):
     HJD Min. I = 2454635.5231(7)+0.3133896(3)E
Note (2): Magnitude difference between variable
     and comparison star GSC 3159-1409


Acknowledgements:  Burak Ulas, bulash(at)gmail.com

(End)    Burak Ulas [EU] , Patricia Vannier [CDS]    02-Dec-2011