In order to determine color excess in the uvbyβ color system for high amplitude ± Scuti stars, reddening free [m1], [c1], and β indices data were obtained from the existing literature for 21 stars. Then, the three intrinsic relations of (b- y)0 - [m1], (b- y)0 -[c1], and (b-y)0 - β were investigated. Among these, it was shown that the (b-y)0 -[c1] relation is the most useful. By establishing intrinsic (b-y)0-[c1] relations for six reddening calibration stars, color excesses of other stars were determined.

• Chulhee Kim(Division of Science Education, and Institute of Fusion Science, Chonbuk National University) Corresponding Author
• J.-H. Choi(Division of Science Education, and Institute of Fusion Science, Chonbuk National University)
• B.-K. Moon(Division of Science Education, and Institute of Fusion Science, Chonbuk National University)
• Soonthornthum Boonrucksar(National Astronomical Research Institute)