Phase instability and non-linearity in the distorted dipole pulsation mode of the rapidly oscillating AP star HR 3831 (HD 83368)

Details Phase instability and non-linearity in the distorted dipole pulsation mode of the rapidly oscillating AP star HR 3831 (HD 83368) Phase instability and non-linearity in the distorted dipole pulsation mode of the rapidly oscillating AP star HR 3831 (HD 83368)

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..343k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 2, p. 343-364.

Astronomy and Astrophysics

Astronomy

30

A Stars, Astronomical Photometry, Frequency Analyzers, Frequency Stability, Peculiar Stars, Stellar Oscillations, Harmonic Generations, Least Squares Method, Light Curve, Nonlinearity

Scientific paper

New high-speed photometric observations of HR 3831 were obtained in 1991 from the South African Astronomical Observatory and Cerro Tololo Inter-American Observatory over a time span of 17 d with a 41 percent duty cycle. A frequency analysis shows that this object pulsates in a single mode which is rotationally modulated, giving rise to a fundamental frequency septuplet, a first harmonic quintuplet, a second harmonic triplet, and a probable detection of a single frequency at the third harmonic. The fundamental frequency septuplet is described by a sum of axisymmetric spherical harmonics with l = 0, 2, and 3. The dominant component of the sum is in a mode called a distorted dipole, whose form changes slightly from year to year.

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