J/AJ/132/960 V(RI)c light-curves of EQ Tauri (Hrivnak+, 2006) ================================================================================ Light-curve study and physical properties of the contact binary EQ Tauri. Hrivnak B.J., Lu W., Eaton J., Kenning D. =2006AJ....132..960H ================================================================================ ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI Keywords: binaries: eclipsing - stars: individual (EQ Tauri) Abstract: New V, R_C_, and I_C_ light curves of EQ Tau have been obtained in 2002 and 2003. These show the secondary minimum to be a total eclipse. These new light curves have been analyzed, together with the published radial velocity observations, using the Wilson-Devinney code. The binary has an overcontact configuration, with an orbital inclination of 85{deg}, a difference in component temperature of 80K, and an overcontact fill-out factor of 16%. Absolute parameters of the component stars have been determined: M1=1.28M_{sun}_, R1=1.17R_{sun}_, L1=1.39 L_{sun}_, and M2=0.47M_{sun}_, R2=0.81R_{sun}_, L2=0.63L_{sun}_. The calculated distance is 180+/-20pc. A critical review of our new timings of minimum light together with previously published ones suggests a change from one constant period to another one around 1974 rather than a cyclical variation. When corrected for energy transfer in the common envelope, the physical parameters of the two components are in good agreement with those of unevolved single stars of similar masses. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 03 48 13.4 +22 18 51 EQ Tau = TYC 1260-909-1 --------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 66 356 Differential Magnitudes for EQ Tau from 2002 and 2003 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 F12.4 d HJDRc ? Heliocentric Julian Date 15- 20 F6.3 mag DelRc ? Differential Magnitude in Cousins R band 24- 35 F12.4 d HJDV Heliocentric Julian Date 38- 43 F6.3 mag DelV Differential Magnitude in Johnson V band 47- 58 F12.4 d HJDIc ? Heliocentric Julian Date 61- 66 F6.3 mag DelIc ? Differential Magnitude in Cousins I band -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Feb-2008