Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315..400p&link_type=abstract
Astronomy and Astrophysics, v.315, p.400-410
Astronomy and Astrophysics
Astrophysics
29
Stars: Individual: {Theta} Tuc = Hr 139, Stars: Oscillations, Stars: Variables: {Delta} Scuti, Infrared: Stars, Ultraviolet: Stars, Stars: Binaries: General
Scientific paper
On the basis of more than 2300 new Stroemgren y and Johnson V photometric observations collected during 246 hours spread over 42 nights at three sites in 1993, we present a frequency analysis of the light variation of θ Tuc. 10 frequencies were found in the range of 15.8 to 20.28cycles/day displaying an extreme regularity. Frequencies are situated in groups and these groups are equally spaced. Some kind of splitting is definitely involved. The frequencies are constant in amplitude on a short time scale. Two frequencies, 0.282 and 0.142cycles/day (3.56 and 7.04days period) were found to be responsible for the mean light level variation of θ Tuc. Although θ Tuc is known as a single star, the length and shape of the mean light level variation and the unusual behaviour of θ Tuc in ultraviolet and infrared suggest that the δ Scuti star θ Tuc is a primary in a binary system with a late F type companion.
Birch Peter V.
Paparo Margit
Spoon Henrik Willem Walter
Sterken Christiaan
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