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Radius, luminosity and pulsation mode of the Delta Cephei star AH Vel
Simultaneous photometric and spectroscopic observations of AH Vel havebeen used to derive radius and luminosity of the star. Its position inthe Hertzsprung-Russell diagram seems to indicate pulsation in the firstharmonic mode when compared to theoretical high temperature edges of theCepheid instability strip. Calculation of the pulsation mass yields avalue which agrees with recently accepted mass-luminosity relations forclassical Cepheids only if AH Vel is pulsating even in the secondharmonic mode. The present measurements seem to rule out the possibilitythat AH Vel is pulsating in the fundamental mode. It is suggested thatfor short-period classical Cepheids there might exist a close connectionbetween pulsation mode and the shape of the light curve. Stars with verysymmetric, small-amplitude light curves are considered to be candidatesfor pulsation in excited modes.
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