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

¹ 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

Corresponding author: S.-L. Kim, slkim@kao.re.kr

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.