Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..453o&link_type=abstract
Astronomische Nachrichten, vol. 323, no. 5, p. 453-461
Astronomy and Astrophysics
Astrophysics
10
Stars: Spots, Stars: Activity, Stars: Late-Type, Stars: Individual (Uz Lib), Binaries: Close
Scientific paper
We present spot models for nine years of continuous VI_C photometry of UZ Lib from 1993-2001. The relatively stable double-humped light curve shape suggests extreme phase coherence. From the spot-modelling analysis, we found that the major spots or spot groups are always located on the hemisphere facing the secondary star and exactly in the opposite hemisphere anti-facing the secondary. Several single-humped light curves and our suggested binary scenario rule out a pure ellipsoidal variability as the cause of the double-humped light curve shape. We try to explain this preferred spot pattern with a magnetic-field structure that connects the two components, as suggested earlier for RS CVn stars in general. A possible 4.8 years spot cycle is found from the long-term brightness variations but needs confirmation. We rediscuss the basic astrophysical data of UZ Lib. The Hipparcos parallax is likely wrong, a possible reason could be that UZ Lib is e.g., a triple system.
Granzer Th.
Oláh Katalin
Strassmeier Klaus G.
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