AU MONOCEROTIS-IMPROVED ELEMENTS

From an analysis, using Wilson-Devinney method, of the corrected yello w light curve of the semi detached eclipsing binary system AU Monocero tis (AU Mon), obtained by Lorenzi (1980b), an improved value for the m ass ratio, q, equal to 0.1985 and reliable geometrical elements were d erived. They give the absolute elements as: m(h)/m. = 5.93 +/- 0.31; m (c)/m. = 1.18 +/- 0.16; R-h/(R). = 5.28 +/- 0.16; R-c/R. = 10.04 +/- 0 .74; Log L-h/L. = 3.16 +/- 0.14; Log L-c/L. = 2.07 +/- 0.21; Log g(h) = 3.76 +/- 0.06; and Log g(c) = 2.51 +/- 0.02. When compared to main s equence stars of similar mass, the primary is found to have normal lum inosity, bigger size and lower temperature while the secondary is foun d to have higher luminosity, bigger size and normal temperature for th eir masses. On the HR diagram of the normal main sequence stars! the p rimary is found to lie near but above the main sequence (brighter by 1 .(m)4). The secondary component is far above the main sequence and is overluminous by about 4.(m)5.