Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...39..153g&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 39, Feb. 1980, p. 153-161. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
9
Cepheid Variables, Pulsars, Stellar Luminosity, Stellar Spectrophotometry, Astronomical Photometry, Astronomical Spectroscopy, Light Curve, Mean, Radii, Stellar Spectra, Ubv Spectra
Scientific paper
Simultaneous photometric and spectroscopic observations of AH Vel have been used to derive radius and luminosity of the star. Its position in the Hertzsprung-Russell diagram seems to indicate pulsation in the first harmonic mode when compared to theoretical high temperature edges of the Cepheid instability strip. Calculation of the pulsation mass yields a value which agrees with recently accepted mass-luminosity relations for classical Cepheids only if AH Vel is pulsating even in the second harmonic mode. The present measurements seem to rule out the possibility that AH Vel is pulsating in the fundamental mode. It is suggested that for short-period classical Cepheids there might exist a close connection between pulsation mode and the shape of the light curve. Stars with very symmetric, small-amplitude light curves are considered to be candidates for pulsation in excited modes.
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