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Title:
The infrared temporal evolution of FG Sagittae
Authors:
Woodward, Charles E.; Lawrence, G. F.; Gehrz, R. D.; Jones, Terry J.; Kobulnicky, H. A.; Cole, James; Hodge, Tracy; Thronson, Harley A., Jr.
Affiliation:
AA(Wyoming Infrared Observatory, Laramie), AB(Minnesota Univ., Minneapolis), AC(Minnesota Univ., Minneapolis), AD(Minnesota Univ., Minneapolis), AE(Minnesota Univ., Minneapolis), AF(Wyoming Infrared Observatory, Laramie), AG(Wyoming Infrared Observatory, Laramie), AH(Wyoming Infrared Observatory, Laramie)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 408, no. 1, p. L37-L40. (ApJL Homepage)
Publication Date:
05/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASYMPTOTIC GIANT BRANCH STARS, INFRARED PHOTOMETRY, STELLAR EVOLUTION, STELLAR SPECTROPHOTOMETRY, PLANETARY NEBULAE, STELLAR ENVELOPES
DOI:
10.1086/186825
Bibliographic Code:
1993ApJ...408L..37W

Abstract

We present near- and mid-infrared photometry of the post-AGB star FG Sge obtained at two distinct epochs separated by a period of 10 yr. Observations of FG Sge taken in 1983 suggest that the 1 to 12 micron energy distribution was produced at that time by a stellar photosphere, with a blackbody temperature of about 5600 K. In late August of 1992, FG Sge exhibited a marked decline (about 3 mag in V) in its visible light curve. At the same time the 1 to 18.0 micron IR energy distribution has evolved to become approximately a 1000 K blackbody. We propose that this light decline partially is due to the ejection and condensation of a dust shell. We esti mate the amount of dust condensed during this episode to be about 3.3 x 10 exp 9 solar masses with a covering factor (total visual depth) of about 0.3.

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