Multiple close frequencies of the Delta Scuti star Theta-2 Tau

Details Multiple close frequencies of the Delta Scuti star Theta-2 Tau Multiple close frequencies of the Delta Scuti star Theta-2 Tau

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...175..117b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 175, no. 1-2, March 1987, p. 117-124. Research supported by the Chinese Academ

Astronomy and Astrophysics

Astrophysics

21

Astronomical Photometry, Binary Stars, Cepheid Variables, Stellar Models, Stellar Oscillations, Electrophotometry, Least Squares Method, Periodic Variations, Stellar Luminosity

Scientific paper

Multisite photoelectric photometry of the Delta Scuti variable θ2Tau has been obtained on three continents from 1982 December, to 1984 February. The star contains at least four close frequencies in the 13 to 15 cycles per day range. A solution involving four frequencies (13.22970, 13.48090, 13.69362 and 14.31756 cycles per day) fits the observations to ±0.003 mag and leaves mainly noise in the power spectrum. The results are interpreted in terms of nonradial pulsation. Recent occultation measurements allow to apply a model of two stars inside the instability strip. This model resolves the known discrepancy between the absolute magnitudes derived for θ2Tau from the Hyades cluster distance modulus and uvbyß photometry. Orbital light-time considerations indicate that the observed (O-C) values of the present four-frequency solution are compatible with pulsation of the primary, rather than the secondary main-sequence star.

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