FG SGE : 1975 to 1978.
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1980
- DOI:
- 10.1086/157848
- Bibcode:
- 1980ApJ...237...99C
- Keywords:
-
- 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;
- Astrophysics