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J/AJ/137/2949             MY Cyg differential light curves       (Tucker+, 2009)
Orbital solutions and absolute elements of the eclipsing binary MY Cygni.
    Tucker R.S., Sowell J.R., Williamon R.M., Coughlin J.L.
   <Astron. J., 137, 2949-2955 (2009)>
   =2009AJ....137.2949T
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI

Keywords: binaries: close - binaries: eclipsing - binaries: spectroscopic


Abstract:
    Differential UBV photoelectric photometry for the eclipsing binary 
    MY Cyg is presented. The Wilson-Devinney program is used to
    simultaneously solve the three light curves together with previously
    published radial velocities. A comparison is made with the previous
    solution found with the Russell-Merrill method. We examine the
    long-term apsidal motion of this well-detached, slightly eccentric
    system. We determine absolute dimensions, discuss metallicity/Am-star
    issues, and estimate the evolutionary status of the stars.

Description:
    The photometric measurements of MY Cyg were obtained with the 36-inch
    Cassegrain reflector at the Fernbank Science Center Observatory
    (Atlanta, GA) during 1972, 1973, and 1974. A total of 1733
    observations were made in each color with the standard UBV filters of
    the Johnson-Morgan (1953ApJ...117..313J) system combined with an
    unrefrigerated EMI 6256s photomultiplier.
Object:
    ---------------------------------------------
       RA   (2000)   DE       Designation(s)
    ---------------------------------------------
    20 20 03.4   +33 56 35    MY Cyg = HD 193637
    ---------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        62     1733   MY Cyg photometric observations
table2.dat        25       28  *MY Cyg radial velocities
table7.dat        79      309   MY Cyg photometric observations by Coughlin 2007
                              (undergraduate thesis, Emory Univ; same
                              comparison star as Williamon 1975AJ.....80..976W)

Note on table2.dat: These radial velocities were previously published by
     Popper (1971ApJ...169..549P ) and are provided here for convenience
     and completeness of our orbital solution.


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

   Bytes Format Units   Label    Explanations

   1- 13  F13.5 d       HJDV     V band Heliocentric Julian date
  15- 20  F6.3  mag     DVmag    Differential Johnson V band magnitude
  22- 34  F13.5 d       HJDB     B band Heliocentric Julian date
  36- 41  F6.3  mag     DBmag    Differential Johnson B band magnitude
  43- 55  F13.5 d       HJDU     U band Heliocentric Julian date
  57- 62  F6.3  mag     DUmag    Differential Johnson U band magnitude


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

   Bytes Format Units   Label     Explanations

   1- 11  F11.3 d       HJD       Heliocentric Julian date
  13- 18  F6.1  km/s    RVp       Radial velocity of the primary
  20- 25  F6.1  km/s    RVs       Radial velocity of the secondary


Byte-by-byte Description of file: table7.dat

   Bytes Format Units   Label     Explanations

   1- 12  F12.4 d       HJDB      ? B band Heliocentric Julian date
  14- 19  F6.3  mag     DBmag     ? Differential B band magnitude
  21- 32  F12.4 d       HJDV      ? V band Heliocentric Julian date
  34- 39  F6.3  mag     DVmag     ? Differential V band magnitude
  41- 52  F12.4 d       HJDR      ? R band Heliocentric Julian date
  54- 59  F6.3  mag     DRmag     ? Differential R band magnitude
  61- 72  F12.4 d       HJDI      ? I band Heliocentric Julian date
  74- 79  F6.3  mag     DImag     ? Differential I band magnitude


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    24-Aug-2011