A&A 405, 231-236 (2003)
DOI: 10.1051/0004-6361:20030630

Search for A-F Spectral type pulsating components in Algol-type eclipsing binary systems

S.-L. Kim¹, J. W. Lee², S.-G. Kwon¹, J.-H. Youn¹, D. E. Mkrtichian^{3, 4} and C. Kim<sup>5

1</sup>  Korea Astronomy Observatory, Daejeon, 305-348, Korea
²  Department of Astronomy and Space Science, Chungbuk National University, Cheongju, 361-763, Korea
³  Astronomical Observatory, Odessa National University, Shevchenko Park, Odessa, 65014, Ukraine
⁴  Astrophysical Research Center for the Structure and Evolution of the Cosmos, Sejong University, Seoul, 143-747, Korea
⁵  Department of Earth Science Education, Chonbuk National University, Chonju, 561-756, Korea

(Received 24 February 2003 / Accepted 2 April 2003)

Abstract
We present the results of a systematic search for pulsating components in Algol-type eclipsing binary systems. A total number of 14 eclipsing binaries with A-F spectral type primary components were observed for 22 nights. We confirmed small-amplitude oscillating features of a recently detected pulsator TW Dra, which has a pulsating period of 0.053 day and a semi-amplitude of about 5 mmag in B-passband. We discovered new pulsating components in two eclipsing binaries of RX Hya and AB Per. The primary component of RX Hya is pulsating with a dominant period of 0.052 day and a semi-amplitude of about 7 mmag. AB Per has also a pulsating component with a period of 0.196 day and a semi-amplitude of about 10 mmag in B-passband. We suggest that these two new pulsators are members of the newly introduced group of mass-accreting pulsating stars in semi-detached Algol-type eclipsing binary systems.

Key words: stars: binaries: eclipsing -- stars: variables: Sct -- stars: individual: TW Dra, RX Hya, AB Per

Offprint request: S.-L. Kim, slkim@kao.re.kr

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