Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147..135c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 1, June 1985, p. 135-142.
Astronomy and Astrophysics
Astrophysics
31
Secular Variations, Stellar Evolution, Variable Stars, Data Reduction, Stellar Luminosity
Scientific paper
New observations and a careful analysis of published data of β CMa stars for which secular variations of pulsational periods have been claimed, lead to the conclusion that probably no such variations exist. For the best observed stars (BW Vul, β Cep, σ Sco, δ Cet, 12 Lac, β CMa, and α Vir) a better fit of the data is obtained assuming that positive and negative period jumps occur. Comparison with other types of variable stars shows that this phenomenon is a general characteristic of pulsating stars. That means that the variations in the period are produced by an unexplained physical phenomenon. The lack of secular variations of the period confirms that the β CMa stars are in the end of the core hydrogen burning phase.
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