Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977pasp...89..339b&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 89, June-July 1977, p. 339-344.
Astronomy and Astrophysics
Astronomy
20
Cepheid Variables, Dwarf Stars, Stellar Evolution, Stellar Mass, Light Curve, Stellar Gravitation, Stellar Motions, Stellar Spectrophotometry
Scientific paper
The variability and mass of the dwarf cepheid prototype, AI Vel, has been investigated during six nights of observations with the uvby beta filters. The two excited periods are found to have average amplitudes of 680 and 370 K, respectively. An average effective gravity of log g = 3.98 and an average effective temperature of 7620 K are found. The low-mass, high-evolution hypothesis is not confirmed for this star. The trigonometric parallax is too uncertain to determine the mass of this star. However, the metallicity index, space motion, and period-gravity relation indicate that AI Vel is in fact a delta Scuti star and in the immediate post-main-sequence (high-mass) phase of evolution.
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