The photometric orbital elements of an Algol-type eclipsing variable, DI Pegasi, are derived by means of Fourier transforms from two-color photoelectric observations. The system shows a long term variation of its orbital period, which is interpreted as due to a continuing mass loss mechanism from the secondary component. Physical dimensions and a model of the system are also suggested here.

ABSTRACT
INTRODUCTION
OBSERVATIONS
THE LIGHT ELEMENTS
RECTIFICATIONS AND ORBITAL SOLUTIONS
REFERENCES

• Kyong Chol Chou(Space Science Division National Aeronautic Space Administration Greenbelt, Maryland)
• Masatosi Kitamura(Tokyo Astronmoical Observatory, Tokyo, Japan)