Context :

Aims : We present the results of our detailed spectroscopic and photometric analysis of two previously unknown < 1 M _ { \odot } detached eclipsing binaries : ASAS J045304-0700.4 and ASAS J082552-1622.8 .

Methods : With the HIgh Resolution Echelle Spectrometer ( HIRES ) on the Keck-I telescope , we obtained spectra of both objects covering large fractions of orbits of the systems .
We also obtained V and I band photometry with the 1.0-m Elizabeth telescope of the South African Astronomical Observatory ( SAAO ) .
The orbital and physical parameters of the systems were derived with the PHOEBE and JKTEBOP codes .
We investigated the evolutionary status of both binaries with several sets of widely-used isochrones .

Results : Our modelling indicates that ( 1 ) ASAS J045304-0700.4 is an old , metal-poor , active system with component masses of M _ { 1 } = 0.8452 \pm 0.0056 M _ { \odot } , M _ { 2 } = 0.8390 \pm 0.0056 M _ { \odot } and radii of R _ { 1 } = 0.848 \pm 0.005 R _ { \odot } and R _ { 2 } = 0.833 \pm 0.005 R _ { \odot } , which places it at the end of the Main Sequence evolution – a stage rarely observed for this type of stars .
( 2 ) ASAS J082552-1622.8 is a metal-rich , active binary with component masses of M _ { 1 } = 0.703 \pm 0.003 M _ { \odot } , M _ { 2 } = 0.687 \pm 0.003 M _ { \odot } and radii of R _ { 1 } = 0.694 ^ { +0.007 } _ { -0.011 } R _ { \odot } and R _ { 2 } = 0.699 ^ { +0.011 } _ { -0.014 } R _ { \odot } .
Both systems show significant out-of-eclipse variations , probably owing to large , cold spots .
we also investigated the influence of a third light in the second system .

Conclusions :