The Detection of Cyclic Frequency Variability in the Rapidly Oscillating Ap-Star HD134214

Details The Detection of Cyclic Frequency Variability in the Rapidly Oscillating Ap-Star HD134214 The Detection of Cyclic Frequency Variability in the Rapidly Oscillating Ap-Star HD134214

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.270..115k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 270, NO. 1/SEP1, P. 115, 1994

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Scientific paper

We have discovered cyclic variability in the pulsation frequency of the rapidly oscillating Ap (roAp) star, HD 134214, at about the same time as similar frequency variability has been found in two other roAp stars, HR 3831 and a Cir. We have obtained 74 hours of new high-speed photometric data in 1991, 1992 and 1993. These new data, plus data obtained previously in 1985 and 1990, give us an accumulated data set spanning nine years. From an analysis of these data, we find a peak-to-peak variation in the pulsation frequency of HD 134214 of 0.42 Hz, on a time-scale of about 248 days, which repeats well but not exactly. A lack of radial velocity variation rules out an explanation of this frequency variability as a Doppler shift caused by binary motion. As with HR 3831, we suggest that the cyclic frequency variability may be caused by a modulation of the magnetic field, similar to such frequency modulations seen in global solar oscillations. HD 134214 shows a modulation in frequency similar to the value detected in the Sun, and the largest yet known for an roAp star. Key words: stars: chemically peculiar - stars: individual: HD 134214 - stars: magnetic fields - stars: oscillations.

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