Long-term stability of the light curves of CQ Ursae Majoris

Details Long-term stability of the light curves of CQ Ursae Majoris Long-term stability of the light curves of CQ Ursae Majoris

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..547j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 547-554.

Astronomy and Astrophysics

Astrophysics

5

A Stars, Light Curve, Peculiar Stars, Dynamo Theory, Interstellar Magnetic Fields, Stellar Magnitude, Stellar Spectrophotometry, Ubv Spectra

Scientific paper

New UBV observations of an Ap-star CQ Uma (HD 119213, HR 5153) are compared to all previously published photometry. An improved photometric rotation period, P(phot) = 2.4499086 +/- 0.0000047 d, is derived. We analyze the long-term stability of the light curve, including the mean brightness, amplitude of the rotational modulation of brightness, the phase of the light minimum, and the photometric rotation period. All these characteristics show strong stability over the whole period of observations, indicating constancy of the spot configuration. If this result is interpreted also as a constancy of the magnetic field structure, any cyclic amplification of the magnetic field is excluded and the magnetic field is either a fossil or a steady dynamo field.

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