Abstract
view Abstract Citations (46) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Infrared Temporal Evolution of FG Sagittae Woodward, Charles E. ; Lawrence, G. F. ; Gehrz, R. D. ; Jones, Terry J. ; Kobulnicky, H. A. ; Cole, James ; Hodge, Tracy ; Thronson, Harley A., Jr. 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. Publication: The Astrophysical Journal Pub Date: May 1993 DOI: 10.1086/186825 Bibcode: 1993ApJ...408L..37W Keywords: Asymptotic Giant Branch Stars; Infrared Photometry; Stellar Evolution; Stellar Spectrophotometry; Planetary Nebulae; Stellar Envelopes; Astrophysics; STARS: CIRCUMSTELLAR MATTER; STARS: EVOLUTION; STARS: INDIVIDUAL CONSTELLATION NAME: FG SAGITTAE full text sources ADS | data products SIMBAD (4)
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