Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1775m&link_type=abstract
Astronomical Journal, vol. 87, Dec. 1982, p. 1775-1782. Research supported by the Comision de Investigaciones Cientificas de la
Astronomy and Astrophysics
Astronomy
28
Light Curve, Periodic Variations, Secular Variations, Stellar Spectrophotometry, Variable Stars, Data Reduction, Electrophotometry, R Coronae Borealis Stars, Stellar Evolution
Scientific paper
Using 10,000 visual estimates taken from the literature and obtained between 1897 and 1977, the 39-day period, 0.6-mag amplitude cycle of RY Sgr is analyzed. 2800 averages were made with these estimates and 460 dates of maxima and an equal number of minima were determined. A secular period change is found analyzing these dates. In the time interval studied the period change is from 39.4 to 38.2 days. Superimposed on this variation is a sinusoidal phase change suggesting a periodicity of about half a century. On top of these two phenomena there are phase shifts of about 10 days that happen rather randomly. These phase shifts seem to be associated with the deep minima of this R CrB-type variable. The meaning of the secular period change is discussed and alternatively explained as mass loss or rapid evolution changes. A possible explanation of the random phase shifts is given.
Marraco Hugo G.
Milesi G. E.
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