The determination of the rotational periods of the rapidly oscillating AP stars from their mean light variations - V. an improved rotation period for the dipole pulsator HD 6532

Details The determination of the rotational periods of the rapidly oscillating AP stars from their mean light variations - V. an improved rotation period for the dipole pulsator HD 6532 The determination of the rotational periods of the rapidly oscillating AP stars from their mean light variations - V. an improved rotation period for the dipole pulsator HD 6532

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280....1k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 1, pp. 1-5.

Other

9

Stars: Individual: Hd 6532, Stars: Oscillations, Stars: Peculiar, Stars: Rotation, Stars: Variables: Other

Scientific paper

We have obtained 87 new differential UBVRI mean light observations of the rapidly oscillating Ap star HD 6532 on 34 nights in 1987 and on 31 nights in 1994. A frequency analysis of these data, together with 43 published observations obtained on 34 nights in 1986, gives a rotation period of P_rot=1.944973+/-0.000011 d, or a rotation frequency of nu_rot=0.514146+/-0.000003 d^-1=5.95076+/-0.00003 muHz. The mean light curve shows a clear double wave which is consistent with both magnetic poles being visible over a rotation period. The U and B curves are in antiphase with the V, R and I curves. The null wavelength, therefore, lies between B and V. This improved rotation frequency is needed for future interpretation of the frequency multiplet generated by the rotational modulation of the rapid 6.9-min pulsation in this star.

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