Journal Article

A photometric study of the southern Blazhko star SS For: unambiguous detection of quintuplet components

K. Kolenberg, E. Guggenberger, T. Medupe, P. Lenz, L. Schmitzberger, R. R. Shobbrook, P. Beck, B. Ngwato and J. Lub

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 1, pages 263-275
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14266.x
A photometric study of the southern Blazhko star SS For: unambiguous detection of quintuplet components

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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.

Keywords: techniques: photometric; stars: individual: SS For; stars: oscillations; stars: variable: RR Lyrae

Journal Article.  7507 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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