Multisite, multicolour observations of Theta Tucanae

Details Multisite, multicolour observations of Theta Tucanae Multisite, multicolour observations of Theta Tucanae

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995dssn....8...10p&link_type=abstract

Delta Scuti Star Newsletter, Issue 8, p. 10-13.

Computer Science

Scientific paper

Theta Tuc (HR 139) was first discovered to be a variable star by Cousins & Largerwey (MNRASSA 30, 12, 1971). The period of light variation was in the range 70-80 min., and the amplitude was found to be variable with a maximum in V light of 0.06 mag typical of Delta Scuti type variability. Later, two independent data sets (556 integrations on six nights in 1972 and 954 observations obtained during 70 hours on 21 nights in 1979) were published and analysed by Stobie & Shobbrook (MNRAS 174, 401, 1976) and Kurtz (MNRAS 193, 61, 1980), respectively. The two independent analyses led to two alternative hypotheses: the first is that the frequencies present in the light curve of Theta Tuc are unstable and may change in a time span as short as 24 hours, the second is that all frequencies in Theta Tuc are completely stable, but that beating among the various frequencies makes them appear to come and go. No definite frequency solution, but only a possible set of frequencies were given.

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