New uvby photoelectric photometry was carried out for a δ Scuti variable, HR1170. By applying the Fourier method and the linear least square method, three frequencies were derived: f 1 = 10.06134 c / d ( P 1 = 0. d 0994 ). f 2 = 11.91754 c / d ( P 2 = 0. d 0839 ). f 3 = 18.96776 c / d ( P 3 = 0. d 0527 ). From the observed pulsational constants and from the phase difference and amplitude ratios for color(b-y) and magnitude y. three different pulsation modes (n, l) of f 1 ( 0 , 0 ) , f 2 ( 1 , 2 ) , f 3 ( 3 , 2 ) are deduced, indicating the existence of nonradial mode in HR1170. Some physical parameters indicate that HR1170 is evolving at the stage of H-shell burning.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. OBSERVATIONS AND REDUCTIONS
Ⅲ. PERIOD DETERMINATION
Ⅳ. MODE IDENTIFICATION
Ⅴ. PHYSICAL PROPERTIES OF HR1170
Ⅵ. SUMMARY
REFERENCES

• KIM SEOUNG-LI(Department of Astronomy, Seoul National University)
• LEE SEE-WOO(Department of Astronomy, Seoul National University)