Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..153m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 153-157.
Astronomy and Astrophysics
Astrophysics
8
Periodic Variations, Stellar Magnitude, Stellar Models, Variable Stars, Astronomical Photometry, Interpolation, Least Squares Method, Modes, Power Spectra
Scientific paper
1013 V observations of the Delta Sct star X Caeli obtained at La Silla Observatory on 10 consecutive nights have been analyzed in the frequency domain. Five independent pulsational modes have been detected, and from a comparison with theoretical models we suggest that two of them are nonradial modes and one of them is the first overtone radial mode. The two strongest modes are nonlinearly coupled and their light curves are slightly nonsinusoidal. Finally, the highest frequency mode could be a high-order nonradial mode excited by resonance with a low-order one. A comparison with the former data set of Smyth et al. (1975) shows no evidence of variations of the mode amplitudes.
Mantegazza Luciano
Poretti Ennio
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