Atmospheric modeling is used to build synthetic spectral energy distributions ( SEDs ) for the individual components of the speckle interferometric binary system HD375 .
These synthetic SEDs are combined together for the entire system and compared with its observational SED in an iterated procedure to achieve the best fit .
Kurucz blanketed models with the measurements of magnitude differences were used to build these SED ’ s .
The input physical elements for building these best fitted synthetic SEDs represent adequately enough the elements of the system .
These elements are : T _ { eff } ^ { a } = 6100 \pm 50 K , T _ { eff } ^ { b } = 5940 \pm 50 K , log g _ { a } = 4.01 \pm 0.10 , log g _ { b } = 3.98 \pm 0.10 , R _ { a } = 1.93 \pm 0.20 R _ { \odot } , R _ { b } = 1.83 \pm 0.20 R _ { \odot } M _ { v } ^ { a } = 3 \hbox { $ . ^ { m } $ } 26 \pm 0.40 , M _ { v } ^ { b } = 3 \hbox { $ . ^ { m } $ } 51 \pm 0.50 , L _ { a } = 4.63 \pm 0.80 L _ { \odot } and L _ { b } = 3.74 \pm 0.70 L _ { \odot } depending on new estimated parallax \pi = 12.02 \pm 0.60 mas .
A modified orbit of the system is built and compared with earlier orbits and the masses of the two components are calculated as M _ { a } = 1.35 M _ { \odot } and M _ { b } = 1.25 M _ { \odot } .
Depending on the estimated physical and geometrical elements of the system , which are assured by synthetic photometry , we suggest that the two components are evolved subgiant ( F8.5 IV & G0 IV ) stars with age of 3.5 Gy formed by fragmentation .