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Astron. Astrophys. 345, 505-513 (1999)

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1. Introduction

This is the second paper presenting the results of the variability search among early B-type stars in the central regions of NGC 869 and NGC 884, the young, twin cluster in Perseus, better known as h and [FORMULA] Persei. In the first paper (Krzesinski & Pigulski 1997; hereafter Paper I), the results of the variability search in the central region of [FORMULA] Persei were presented. In that paper, we announced the discovery of two [FORMULA] Cephei stars, Oo 2246 and Oo 2299, as well as the nine other variables. These discoveries convinced us that the CCD technique we applied is indeed suitable for finding low-amplitude variables in both clusters.

In this paper, we show the results of a similar search in the central region of the other cluster, h Persei (NGC 869). As in [FORMULA] Persei, the observations were carried out at Mt. Suhora Observatory from 1994 to 1997. In 1997, additional observations were made at the Bial ków Observatory. The obervations and reductions are briefly described in Sect. 2; in the following three sections we present B-type pulsators, eclipsing binaries and other variables discovered during the search. Both the [FORMULA] data and the H-R diagram of the cluster are presented in Sect. 6. In the last section the consequences of our findings are discussed.

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© European Southern Observatory (ESO) 1999

Online publication: April 19, 1999
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