A&A Supplement series, Vol. 128, March II 1998, 441-445
Received June 16; accepted 5 August, 1997
P. Vivekananda Rao and M.B.K. Sarma
Send offprint request: P. Vivekananda Rao, e-mail: pvr@ouastr.ernet.in
Centre for Advanced Study in Astronomy, Osmania University,
Hyderabad - 500 007, India
From an analysis, using Wilson-Devinney method, of the corrected yellow light
curve of the semi detached eclipsing binary system AU Monocerotis (AU Mon),
obtained by Lorenzi (1980b), an improved value for the mass ratio, q, equal to
0.1985 and reliable geometrical elements were derived.They give the absolute
elements as: 
; 
; 
;
; 
; 
;
; and 
. When compared to main sequence
stars of similar mass, the primary is found to have normal luminosity, bigger
size and lower temperature while the secondary is found to have higher luminosity,
bigger size and normal temperature for their masses. On the HR diagram of the normal
main sequence stars, the primary is found to lie near but above the main sequence
(brighter by 
). The secondary component is far above the main sequence and is
overluminous by about 
.
keywords: Binaries: eclipsing -- stars: AU Mon -- stars: fundamental parameters