Volume 575, March 2015
|Number of page(s)||7|
|Section||Catalogs and data|
|Published online||13 February 2015|
The Hvar survey for roAp stars
II. Final results
Department of Theoretical Physics and AstrophysicsMasaryk
2 Institut für Astrophysik der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
3 Copernicus Astronomical Center, Bartycka 18, 00-716, Warsaw, Poland
4 Hvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, 10000 Zagreb, Croatia
Received: 5 November 2014
Accepted: 14 January 2015
Context. The 60 known rapidly oscillating Ap (roAp) stars are excellent laboratories to test pulsation models in the presence of stellar magnetic fields. Our survey is dedicated to search for new group members in the northern hemisphere.
Aims. We attempt to increase the number of known chemically peculiar stars that are known to be pulsationally unstable.
Methods. About 40 h of new CCD photometric data of 21 roAp candidates, observed at the 1 m Austrian-Croatian Telescope (Hvar Observatory) are presented. We carefully analysed these to search for pulsations in the frequency range of up to 10 mHz.
Results. No new roAp star was detected among the observed targets. The distribution of the upper limits for roAp-like variations is similar to that of previoius similar efforts using photomultipliers and comparable telescope sizes.
Conclusions. In addition to photometric observations, we need to consolidate spectroscopic information to select suitable targets.
Key words: stars: chemically peculiar / stars: variables: general
© ESO, 2015
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