TU Bootis: An ambiguous W Ursae Majoris system

Free access article

Issue		Astron. Astrophys. Suppl. Ser. Volume 117, Number 1, May_II 1996


Page(s)		105 - 112
DOI		http://dx.doi.org/10.1051/aas:1996143

TU Bootis: An ambiguous W Ursae Majoris system DOI: 10.1051/aas:1996143

Astronomy and Astrophysics Supplement Series, Vol. 117, May II 1996, 105-112

P.G. Niarchos , M. Hoffmann and H.W.Duerbeck

Send offprint requests to: P.G. Niarchos

Section of Astrophysics, Department of Physics, University of Athens, Panepistimiopolis, GR-15783 Zographos, Athens, Greece
Alter Weg 7, D-54570 Weidenbach, Germany
Astronomisches Institut, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany

Received January 20; accepted November 11, 1995

Abstract:

The W UMa system TU Boo has a period of 0.32438 days and a spectral type G3. We present here the first photometric analysis, based on photoelectric B and V light curves. The q-search method was used to find the preliminary range of the mass-ratio in order to search for the final solution. The unspotted solution was found by using the unperturbed part of the light curve and applying the DC program of the WD code. Spot models were computed, a one-spot model to explain the O'Connell effect (

fainter than

) by introducing a cool spot on the larger component, and a two-spot model to explain both the O'Connell effect and the small excess of light just after

by assuming, in addition, a bright region on the smaller component near the neck region of the common envelope. TU Boo is an A-type W UMa system with complete eclipses, the secondary minimum being an occultation. However, the derived physical parameters of the system and its light curve anomalies are more common for slightly evolved W-type systems.

Key words: stars: TU Boo --- binaries: eclipsing --- starspots

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