Volume 542, June 2012
|Number of page(s)||6|
|Section||Stellar structure and evolution|
|Published online||12 June 2012|
The Hvar survey for roAp stars
I. The survey observations⋆
Department of Theoretical Physics and AstrophysicsMasaryk
2 Rozhen National Astronomical Observatory, Institute of Astronomy of the Bulgarian Academy of Sciences, PO Box 136, 4700 Smolyan, Bulgaria
3 Institut für Astronomie der Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
4 Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
5 Hvar Observatory, Faculty of Geodesy, University of Zagreb, Kačićeva 26, 10000 Zagreb, Croatia
Received: 28 December 2011
Accepted: 1 May 2012
Context. The rapidly oscillating Ap (roAp) stars exhibit short time scale photometric and/or radial velocity variations, which are most important to test current pulsation models as well as our assumptions of the atmospheric structure characteristics. In addition, their chemical peculiarity makes them very interesting for probing stellar formation and evolution in the presence of a global magnetic field. To date, only a limited number of about 45 roAp stars are known.
Aims. In order to increase the sample, we obtained photometric time series of 20 good roAp candidates to search for pulsations.
Methods. We present the time series analysis of about 60 h of CCD photometry taken at the 1 m Austrian-Croatian Telescope (Hvar Observatory) and derive effective temperatures for the programme objects.
Results. The upper amplitude limits of the Fourier spectra are typically below 2 mmag in Bessell B with one good candidate for follow-up observations to find possible pulsation. In addition, we present a list of further roAp candidates, worth to be (re)investigated.
Key words: stars: chemically peculiar / stars: variables: general / stars: early-type / stars: oscillations
The reduced photometric data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/542/A89
© ESO, 2012
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