A photometric study of the southern Blazhko star SS For: unambiguous detection of quintuplet components |
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| Authors: | K Kolenberg E Guggenberger T Medupe P Lenz L Schmitzberger R R Shobbrook P Beck B Ngwato J Lub |
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| Institution: | Institute of Astronomy, Türkenschanzstrasse 17, A-1180 Vienna, Austria;Department of Astronomy, University of Cape Town, South Africa;Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT, Australia;Theoretical Astrophysics Programme, North West University, Mmabatho, South Africa;Leiden Observatory, Niels Bohrweg 2, NL-2333 CA Leiden, the Netherlands |
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| Abstract: | We present our analysis of photometric data in the Johnson B and V filter of the southern Blazhko star SS For. In parallel, we analysed the V observations obtained with the All Sky Automated Survey-3 photometry of the star gathered between 2000 and 2008. In the frequency spectra resulting from a Fourier analysis of our data, the triplet structure is detectable up to high order, both in the B and V data. Moreover, we find evidence for quintuplet components. We confirm from our data that the modulation components decrease less steeply than the harmonics of the main frequency. We derived the variations of the Fourier parameters quantifying the light-curve shape over the Blazhko cycle. There is good agreement between the spectroscopic abundance and the metallicity determined from the Fourier parameters of the average light curve. SS For is peculiar as a Blazhko star because of its strong variations around minimum light. |
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| Keywords: | techniques: photometric stars: individual: SS For stars: oscillations stars: variable: RR Lyrae |
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