Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..813m&link_type=abstract
Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. 813, 1994
Astronomy and Astrophysics
Astrophysics
21
Stars: Variable - Lines: Profile - Stars: Individual: Lupi - Stars: Oscillations
Scientific paper
We present high spectral and time resolution observations of high signal-to-noise ratio (above 200) of the β Cephei star α Lupi, carried out for three different wavelengths during three nights. The radial velocity curves show a nice sinusoidal behaviour for all elements. However, the amplitude and the average velocity of the variation depend on the considered lines. By means of a simple least squares fit conducted on each observed night, we also point out a non-constancy of the pulsation period. A comparison between the RI and FWHM curves seems to indicate that temperature effects are present during the pulsation, while the EW varies by about 3%. The radius variation and acceleration curves have a small amplitude, indicating that the motion does not have any strong non-linear behaviour.
The moment method was used to derive the pulsation parameters. The main mode was found to be a radial one. Due to the non-constancy of the period and to the fact that two frequencies were detected in the photometric data, a search for a second period in the moments has been conducted. Therefore, the moment method has been generalized for a multiperiodic pulsation. The moments tend to indicate that a second mode indeed is present. Application of the generalized moment method to the spectra of α Lupi did not lead to a unique solution for the possible second mode, although the analysis yields the presence of a small-amplitude axisymmetric mode with degree 1 ≤ l ≤ 3.
Aerts Christine
de Pauw M.
Gillet Denis
Mathias Ph.
Waelkens Christoffel
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