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J/A+AS/125/407    UBV photometry of V839 Ophiuchi            (Akalin, 1997)
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UBV photometry and period variations of V839 Ophiuchi
    Akalin A., Derman E.
   <Astron. Astrophys. Suppl. Ser. 125, 407 (1997)>
   =1997A&AS..125..407A       (SIMBAD/NED BibCode)
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ADC_Keywords: Binaries, eclipsing ; Photometry, UBV
Keywords: binaries: eclipsing - stars: individual: V839 Oph

Abstract:
    A complete period variation analysis and new light curves of V839 Oph
    together with new ephemeris data are presented. The period variation
    was found to be dP/dt=3.1x10^-7d/yr. The period increament indicates
    that the conservative mass transfer rate from the less massive
    component to the more massive one is 6.5x10^-7M_sun_/yr. We fitted
    parabolic and we discuss the possible detection of sinusoidal curves
    to the (O-C) diagram and sinusoidal oscillations with period of about
    20yr and semi-amplitude of 0.0065 day. A simultaneous solution of the
    B and V light curves was computed using the Wilson-Devinney synthetic
    light-curve code. The light curve solution indicates that the A-type W
    UMa-type system is in contact with a filling factor of ~39%.

Objects:
    --------------------------------------------------------------------
       RA   (2000)   DE      Designation(s)
    --------------------------------------------------------------------
    18 09 21.3   +09 09 04   V839 Oph   = HD 166231 (variable star)
    18 08 50.6   +09 04 16   BD+09 3578 = HD 166099 (comparison star)
    18 08 33.6   +09 00 50   BD+08 3590 = HD 166048 (check star)
    --------------------------------------------------------------------

File Summary:
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 FileName    Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe         80        .    This file
table2         53     1149    The data for light curves and colours of V839 Oph
                               between 1989 and 1994
table5         70       71    Epochs of minimum light of V839 Oph
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Byte-by-byte Description of file: table2
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   Bytes Format Units   Label     Explanations
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   1- 12  F12.4 d       HJD       Heliocentric Julian day
  16- 21  F6.3  mag     DVmag     ? Diferential V magnitude (1)
  24- 29  F6.3  mag     DBmag     ? Diferential B magnitude (1)
  32- 37  F6.3  mag     DUmag     ? Diferential U magnitude (1)
  40- 45  F6.3  mag     D(B-V)    ? Diferential (B-V) colour
  48- 53  F6.3  mag     D(U-B)    ? Diferential (U-B) colour
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Note (1): Differential measurement in the sense variable minus comparison,
           after the correction for differential atmospheric extinction
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Byte-by-byte Description of file: table5
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   Bytes Format Units   Label     Explanations
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   1- 12  F12.4 d       HJDMin    Heliocentric Julian day at minimum light
      15  I1    ---     Type      Type of the minimum
  18- 24  A7    ---     Data      Data used to find the minimum (1)
  27- 34  F8.1  d       Epoch     Epoch number
  37- 44  F8.5  d       (O-C)     Linear ephemeris
  47- 54  F8.5  d       (O-C)'q   Residuals from the quadratic ephemeris
  57- 64  F8.5  d       (O-Cs)'   Residuals from the best fit
  67- 68  I2    ---     Ref       Source of the minima time (2)
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Note (1): v: visual
         pg: photographic
         pe: photoelectric
Note (2): Sources :
              1) Rigollet, 1947LAstr..61...54R
              2) Binnendijk, 1960AJ.....65...79B
              3) Wilaon and O'Toole, 1965PASP...77...58W
              4) Diethelm, 1974BBSAG..16....1D
              5) Diethelm, 1974BBSAG..17....1D
              6) Diethelm, 1975BBSAG..23....1D
              7) Diethelm, 1976BBSAG..29....1D
              8) Braune et al., 1981AN....302...53B
              9) Diethelm, 1978BBSAG..39....1D
             10) Diethelm, 1979BBSAG..44....1D
             11) Diethelm, 1981BBSAG..56....1D
             12) This paper (data from Lafta and Grainger, 1985Ap&SS.114...23L)
             13) Kreiner, 1988Roczn..59....1K
             14) Ferrand, 1985BBSAG..58....1F
             15) Niarchos, 1988IBVS.3156....1N
             16) Kohl, 1985BBSAG..77....1K
             17) Diethelm, 1985BBSAG..77....1D
             18) Hanzl, 1990IBVS.3423....1H
             19) this paper
             20) Hanzl, 1991IBVS.3615....1H
             21) Paschke, 1990BBSAG..96....1P
             22) Blattler , 1991BBSAG..98....1B
             23) Hanzl, 1994IBVS.4097....1H
             24) Agerer and Hubscher, 1995IBVS.4222....1A
             25) Demircan et al., 1994IBVS.4126....1D
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Acknowledgements: Ayvur Akalin-Peletier <Ayvur.Akalin-Peletier@durham.ac.uk>

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(End)          Ayvur Akalin [Ankara University Observatory]          16-Dec-1997