The infrared temporal evolution of FG Sagittae

Details The infrared temporal evolution of FG Sagittae The infrared temporal evolution of FG Sagittae

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408l..37w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 408, no. 1, p. L37-L40.

Astronomy and Astrophysics

Astrophysics

33

Asymptotic Giant Branch Stars, Infrared Photometry, Stellar Evolution, Stellar Spectrophotometry, Planetary Nebulae, Stellar Envelopes

Scientific paper

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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