As a part of the short-period variability survey (SPVS) at Bohyunsan Optical Astronomy Observatory, we obtained time-series BV CCD images in the region of Cyg OB3 association centered on the open cluster NGC 6871. The observations were performed for 18 nights from September 5, 2008 to September 1, 2009. We found 15 short-period variable stars in the region. They are δ Scuti type stars belonging to the local spiral arm, Orion spur. Among them, only two stars were previously known, and the rest are newly discovered ones. In this paper, we have performed a multiple-frequency analysis to determine frequencies of the 15 δ Scuti type stars, using the discrete Fourier transform and linear least-square fitting methods. One of the newly discovered variable stars is a double-mode δ Scuti type star with the fundamental and the first overtone modes, and two are high amplitude δ Scuti stars.

ABSTRACT
1. 서론
2. 관측 및 분석
3. 결과
    3.1. 광도곡선과 주파수 분석
    3.2. 색-등급도
4. 요약
참고 문헌

• 전영범(한국천문연구원, 경북대학교) | YOUNG-BEOM JEON (Korea Astronomy and Space Science Institute, Kyungbuk National University)
• 이의렬(한국과학기술원) | UIRYEOL LEE (Korea Advanced Institute of Science and Technology)
• 박윤호(한국천문연구원) | YOON-HO PARK (Korea Astronomy and Space Science Institute)
• 김동현(연세대학교) | DONGHYEON KIM (Yonsei University)
• 장혜은(서울대학교) | HYEEUN JANG (Seoul National University)
• 조성윤(한국과학기술원) | SUNGYOON CHO (Korea Advanced Institute of Science and Technology)