A Decade of Photometry of Lq-Hydrae

Details A Decade of Photometry of Lq-Hydrae A Decade of Photometry of Lq-Hydrae

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276..345j&link_type=abstract

Astronomy and Astrophysics, Vol.276, NO. 2/SEPII, P. 345, 1993

Astronomy and Astrophysics

Astrophysics

30

Stars: Individual: Lq Hya, Stars: Activity, Stars: Variable, Stars: Rotation

Scientific paper

A study of a decade of photometry of the BY Draconis star LQ Hya (HD 82558) is presented and an improved photometric rotation period 1.d601136±0.d000013 is derived. The changing light curves indicate that the spot configuration can sometimes evolve significantly on a time scale of a few months. The variation of the photometric rotation period is significant indicating the presence of differential rotation. On the other hand, if a constant period were assumed, the spots would concentrate on two active longitudes. The mean brightness shows a cycle with a period of 6.2 years having a peak to peak amplitude of about O.m1 in V. The mean effective temperature of LQ Hya also follows this cycle.

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