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J/AJ/136/1667       VV Vir BVRI differential photometry       (Samec+, 2008)
Photometric analysis and 60-Year period study of the detached but near-contact
system VV Virginis.
    Samec R.G., Labadorf C.M., Behn G.A., Chamberlain H.A., Faulkner D.R.,
    Van Hamme W.
   <Astron. J., 136, 1667-1676 (2008)>
   =2008AJ....136.1667S
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI

Keywords: binaries: close - binaries: eclipsing - stars: evolution -
          stars: individual (VV Virginis)

Abstract:
    VV Vir is a near-contact but detached mid-G-type eclipsing binary with
    an asymmetrical light curve due to a weak but regular mass exchange.
    The binary is apparently approaching contact and has a stream impact
    spot on the secondary component that is responsible for a
    quadratically [dP/P=(-7.8±0.2)x10-11] decreasing period. Our period
    study included more than 140 minima observed over the past 60 years.
    We explore other possible near-contact configurations for this binary.

Description:
    Our CCD observations of VV Vir were taken on 2006 May 15-17 at Lowell
    Observatory and May 28 of the same year at Kitt Peak in remote mode.
Objects:
    -------------------------------------------------
       RA   (2000)   DE      Designation(s)
    -------------------------------------------------
    14 05 25.2   -10 09 22   VV Vir =  SV* HV 3677
    -------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        75      166   Photometry of VV Vir


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

   Bytes Format Units   Label   Explanations

   1-  5  F5.3  mag     DBmag   Differential B band magnitude (1)
   7- 18  F12.4 d       HJD-B   Heliocentric Julian date of B band observation
  20- 24  F5.3  mag     DVmag   ? Differential V band magnitude (1)
  26- 37  F12.4 d       HJD-V   ? Heliocentric Julian date of V band observation
  39- 43  F5.3  mag     DRmag   ? Differential R band magnitude (1)
  45- 56  F12.4 d       HJD-R   ? Heliocentric Julian date of R band observation
  58- 62  F5.3  mag     DImag   ? Differential I band magnitude (1)
  64- 75  F12.4 d       HJD-I   ? Heliocentric Julian date of I band observation

Note (1): variable - comparison (GSC 5557-0259, RA=14:04:42.34, DE=-10:04:07.1)
           star.


History:
    From electronic version of the journal
(End)                  Greg Schwarz [AAS], Patricia Vannier [CDS]    08-Apr-2011