Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..841f&link_type=abstract
Astrophysical Journal, Part 1, vol. 231, Aug. 1, 1979, p. 841-845.
Astronomy and Astrophysics
Astronomy
13
Cepheid Variables, Infrared Astronomy, Periodic Variations, Stellar Spectrophotometry, Ubv Spectra, Graphs (Charts), Light Curve, Radial Velocity, Stellar Evolution, Stellar Radiation, Visual Photometry
Scientific paper
UBVRI photometry and a small number of concurrent radial velocities are given for the 45-day classical Cepheid, SV Vulpeculae. Reinvestigation of the star's period, previously considered to be erratic, shows in fact that the period is smoothly decreasing with time at a rate of 254 + or - 10 s per year. This is interpreted as being due to evolution on the H-R diagram, and a comparison is made between the period rate derived from theoretical models and observation. Good agreement is found. It is pointed out, however, that this good agreement is fortuitous, and that models with differing metallicity, l/H, etc., might give different predictions of the period rate. But, by the same token, the observed period rate offers a new hold on such theoretical parameters, and it is suggested that searches for similar period changes in other long-period Cepheids might be productive for stellar-evolution theory.
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