SIMBAD references

1996A&A...315..400P - Astronomy and Astrophysics, volume 315, 400-410 (1996/11-3)

Complex behaviour of the δ Scuti star θ Tucanae. I. Frequencies in the light variation.


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: individual: θ Tuc = HR 139 - stars: oscillations - stars: variables: δ Scuti - Infrared: stars - ultraviolet: stars - stars: binaries: general

Simbad objects: 16

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