FG Sagittae - 1975 to 1978

Details FG Sagittae - 1975 to 1978 FG Sagittae - 1975 to 1978

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237...99c&link_type=abstract

Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 99-104.

Astronomy and Astrophysics

Astrophysics

13

Abundance, Sagittarius Constellation, Stellar Spectrophotometry, Variable Stars, Mixing Length Flow Theory, Nuclear Capture, Nuclear Fusion, Periodic Variations, Planetary Nebulae, Spectrum Analysis, Stellar Temperature, Thermal Neutrons

Scientific paper

The spectrum of the extremely peculiar variable star, FG Sagittae, has been followed with high dispersion over the interval from 1975 to 1978. A new technique for crude abundance determinations is presented. Using the spectrum ratio method, we find that the steady increase in the s-process element abundances, which began in approximately 1964, has ceased. A cooling of only 500 K is permitted over the 3 years of the present observations, at least on the specific dates the star was observed. The agreement between convective time scales derived from a simple application of the mixing length theory and the observed time scale for the s-process episode implies that this event occurred as a result of a convective zone penetrating for a short time into a region where s-process nucleosynthesis had already occurred.

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