On the non-variability of HR 7653 (15 Vul) based on BRITE data

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Authors	SMALLEY Barry PAUNZEN Ernst LUFTINGER Theresa MOFFAT Tony PIGULSKI Andrzej RUCINSKI Slavek SIKORA Jason WADE Gregg WEISS Werner
Year of publication	2018
Type	Article in Periodical
Magazine / Source	Bulgarian Astronomical Journal
MU Faculty or unit	Faculty of Science
Citation
Keywords	stars: early-type; stars: fundamental parameters; techniques: photometric
Description	We present space-based BRITE photometric observations of the metallic line (CP1) star HR 7653 (15 Vul). This chemically peculiar star of the upper main sequence was suspected to show variability due to rotation and a magnetic field. Such a variability is quite unusual among the, in general, non-magnetic CP1 stars. We investigated the astrophysical parameters of HR 7653 placing it close to the terminal age main sequence or even in the subgiant phase. The longest BRITE data set has a time base of 18.01 d from which we conclude that there are no coherent long-period variations (> 1 d) visible above 2.1 mmag in the red and 6.6 mmag in the blue. Furthermore, we searched for ffi Scuti type pulsations. On the basis of a discrete Fourier analysis method, we find no peaks in the Fourier spectra above 0.5 mmag and 8.6 mmag, for the red and blue filters, respectively.
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