The Recent Optical and Infrared Temporal Evolution of FG Sge

Details The Recent Optical and Infrared Temporal Evolution of FG Sge The Recent Optical and Infrared Temporal Evolution of FG Sge

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18111911l&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #119.11; Bulletin of the American Astronomical Society, Vol. 25, p.742

Astronomy and Astrophysics

Astronomy

Scientific paper

We present optical and infrared observations of the post-AGB star FG Sge obtained at two epochs separated by a period of ten years. Observations of FG Sge taken in 1983 suggest that the 1 microns to 12 microns energy distribution was produced at that time by a stellar photosphere, with a blackbody temperature of 5600 K. In late August of 1992, FG Sge exhibited a marked decline ( 3 mag at V) in its visible light curve. At the same time the 1 microns to 18.0 microns infrared energy distribution has evolved to become a 1000 K blackbody. We propose that this light decline partially is due to the ejection and condensation of a dust shell. We estimate the amount of dust condensed during this episode to be 3.3 x 10(-9) M_&sun;, with a covering factor (total visual depth) of 0.3. Research at the University of Minnesota is supported by the NSF and NASA.

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