Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...325..563s&link_type=abstract
Astronomy and Astrophysics, v.325, p.563-568
Astronomy and Astrophysics
Astrophysics
15
Stars: Individual: {Theta} Tuc, Stars: Oscillations, Stars: {Delta} Scuti Stars, Stars: Binaries: General
Scientific paper
On the basis of almost 1500 uvby photometric observations of θ Tucanae collected in 1993, we discuss the colour variation of this multi-periodic δ Scuti star and debate some of its binary and pulsational properties. The frequencies f_1_=0.281 and f_2_=0.142c/d embody orbital motion in a 7.04d day ellipsoidal configuration characterised by a light curve with unequal maxima and minima and a colour index that becomes bluer during the minimum phases. The first results of an analysis of the light curve points towards a mass ratio q of the order of 0.10-0.15. We present dependable numerical values for colour phase differences and amplitude ratios A_b-y_/A_y_, φ_b-y_-φ_y_, A_v-y_/A_y_, φ_v-y_-φ_y_ and A_u-y_/A_y_, φ_u-y_-φ_y_ which can be used for pulsation-mode identification. The principal pulsation frequency f_7_=20.28c/d is reconcilable with a radial mode.
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