FG SGE in 1986-1991 - The evolution continues

Details FG SGE in 1986-1991 - The evolution continues FG SGE in 1986-1991 - The evolution continues

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19..235a&link_type=abstract

Astronomy Letters, Vol. 19, p. 235-241; Pis'ma v Astronomicheskij Zhurnal (ISSN 0320-0108), vol. 19, no. 7, p. 593-608. In Russ

Astronomy and Astrophysics

Astronomy

3

Color-Magnitude Diagram, Light Curve, Stellar Evolution, Ubv Spectra, Variable Stars, Electrophotometry, Stellar Spectra

Scientific paper

Light curves of FG Sge, constructed according to UBV observations during 298 nights over the period 1986-1991, are presented. Annual values of V, B - V, and U - B do not exhibit a significant trend over this period. Color-magnitude diagrams exhibit a marked scattering, although a brightness correlation with the color index is observed, and the star is redder at minima. The scattering may be due to the shock wave causing a hump on the light curve. Analysis of the periodicity of light variations shows a period increase with time that is especially noticeable during 1975-1979 and slower during 1984-1991. If the period variation reflects the cooling process, the decline in the star's temperature did not end in 1979, but still continues at a very slow rate.

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