Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210..779k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Oct. 15, 1984, p. 779-789.
Astronomy and Astrophysics
Astronomy
28
A Stars, Magnetic Stars, Stellar Oscillations, Frequencies, Light Curve, Phase Shift, Spectrum Analysis, Stellar Models, Stellar Spectrophotometry
Scientific paper
High speed photometric observations of α Cir have been obtained during 138 hr on 38 nights in 1981 and 1983. A frequency analysis reveals the presence of only two frequencies in the light variations of α Cir down to a noise level of 0.2 mmag. The principal frequency is f1 = 8.791347±0.000008 hr-1 (P = 409.4936±0.0004 s); the secondary frequency is f2 = 8.7821±0.0007 hr-1. A comparison of these two frequencies with appropriately scaled solar models indicates a radial overtone of k ≈ 25. It is suggested that these two frequencies are associated with pulsation in modes of overtone and order (k, l) and (k-1, l+2). A phase shift for f1 of Δφ(V, B-V) = 13°±6° is found, the interpretation of which is problematical.
Balona Luis A.
Kurtz Don W.
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