J/AJ/119/1389 Properties of the binary star FS Monocerotis (Lacy+, 2000) ================================================================================ Absolute properties of the eclipsing binary star FS Monocerotis Lacy C.H.S., Torres G., Claret A., Stefanik R.P., Latham D.W., Sabby J.A. =2000AJ....119.1389L ================================================================================ ADC_Keywords: Binaries, eclipsing ; Photometry Keywords: binaries: eclipsing - binaries: spectroscopic - stars: evolution - stars: fundamental parameters - stars: individual (FS Monocerotis) Abstract: We present photometric observations in B and V as well as spectroscopic observations of the 1.9 day-period, double-lined main-sequence eclipsing binary FS Mon. From the analysis of the light curves and radial velocity curves, we have determined the masses and radii of the components: 1.631+/-0.012 M_sun_ and 2.051+/-0.012 R_sun_ for the primary component; 1.461+/-0.010 M_sun_ and 1.629+/-0.012 R_sun_ for the secondary component. The formal uncertainties are all less than 1%. Based on our light curves as well as on the combined-light photometry of the system, we estimate effective temperatures of 6715+/-100 K for the primary and 6550+/-100 K for the secondary component, corresponding to spectral types of F2 and F4, respectively. Projected rotational velocities (v sin i) from the spectrograms are measured as 52+/-2 km.s^-1^ and 43+/-3 km.s^-1^, respectively, from the spectrograms and are consistent with rotation that is synchronous with the orbital motion. Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 07 24 42.3 -05 09 15 FS Mon = BD -04 1937 -------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table6.dat 24 249 Differential photometry of FS Mon in B table7.dat 24 249 Differential photometry of FS Mon in V -------------------------------------------------------------------------------- Byte-by-byte Description of file: table6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 F13.5 d JD Julian date 20- 24 F5.3 mag DeltaB Change in the B band magnitude -------------------------------------------------------------------------------- Byte-by-byte Description of file: table7.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 F13.5 d JD Julian date 20- 24 F5.3 mag DeltaV Change in the V band magnitude -------------------------------------------------------------------------------- History: From AJ electronic edition ================================================================================ (End) Greg Schwarz [AAS] 17-Apr-2000