Τίτλος:
TU Bootis: An ambiguous W Ursae Majoris system
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
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
(Max II fainter than Max I) 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 Max I 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.
Συγγραφείς:
Niarchos, PG
Hoffmann, M
Duerbeck, HW
Περιοδικό:
Astronomy and Astrophysics. Supplement Series
Εκδότης:
EDITIONS PHYSIQUE
Λέξεις-κλειδιά:
stars, TU Boo; binaries, eclipsing; starspots
