CDROM/PASP/V108/P0338 Contact Binary BF Pavonis (Gonzalez+ 1996) ================================================================================ Photometric Analysis of the Contact Binary BF Pavonis J. F. Gonzalez, E. Lapasset, M. Gomez, and J. Ahumada <1995, PASP, 108, 338> =1995PASP..108..338G ================================================================================ Abstract: We present UBV photoelectric observations of the W UMa star BF Pav obtained between 1987 and 1993. A time-of-minimum study allows detection of a likely period increase of about 0.015 s/yr. The Wilson-Devinney code is employed to simultaneously model the B and V light curves for several fixed values of the mass ratio q. From the quality-of-fit of the different solutions an approximate value of q=1.4+/-0.2 is derived. Absolute values of masses, dimensions, and luminosities are estimated by means of standard mass-luminosity relations for main-sequence stars. The detected period variation determines a lower limit of 5 x 10^-7 Msun/yr for the rate of mass transfer from the less-massive to the more-massive component. We speculate that BF Pav has recently become in contact and is now in a rapid phase of mass transfer. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table1v.dat 16 417 Differential V observations of BF Pavonis table1b.dat 16 808 Differential B observations of BF Pavonis table1u.dat 16 123 Differential U observations of BF Pavonis -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1v.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 D9.4 HJD HJD HJD of observation (-2440000) 10-16 F7.3 mag dV Differential (Var-Comp) V magnitude -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1b.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 D9.4 HJD HJD HJD of observation (-2440000) 10-16 F7.3 mag dB Differential (Var-Comp) B magnitude -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1u.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 D9.4 HJD HJD HJD of observation (-2440000) 10-16 F7.3 mag dU Differential (Var-Comp) U magnitude -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 07-May-1996