Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-31
Astronomy and Astrophysics
Astrophysics
16 pages, 12 Postscript figures, 1 long table. Table 2 is only available in electronic form. Journal-ref: Astronomy and Astrop
Scientific paper
10.1051/0004-6361:20065574
We have explored a sample of suspected A-type binaries in a systematic way, both spectroscopically and photometrically. Due to their location in the H-R diagram, indications of pulsation and/or chemical peculiarities among these suspected binary (or multiple) systems may be found. High-resolution spectroscopy obtained with the ELODIE and MUSICOS spectrographs was used in combination with a few nights of differential CCD photometry in order to search for pulsation(s). Of the 32 investigated targets, eight are spectroscopic binaries, one of which is a close binary also showing eclipses, and three have been identified as Delta Scuti pulsators with rapid line-profile variations. Among the latter stars, HD 217860 reveals interesting multiperiodic photometric and spectroscopic variations, with up to eight frequencies common to two large photometric data sets. We suggest that at least one radial overtone mode is excited among the two most dominant frequencies. We furthermore found evidence for a strong modulation of the amplitude(s) and/or the (radial) frequency content of this intriguing Delta Scuti star.
Cauteren Van P.
Cuypers Jan
de Cat Peter
Dimitrov Darko
Frémat Yves
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