The circumstellar environment of the FU Orionis pre-outburst candidate V1331 Cygni

High resolution (approximately 4 sec) aperture synthesis maps of the CO (1 yields 0), (13)CO (1 yields 0), (13)CO (2 yields 1), and asociated continuum emission from the FU Orions candidate V1331 Cygni reveal a massive, 0.5 +/- 0.15 solar mass, circumstellar disk surrounded by a flattened gaseous envelope, 6000 x 4400 AU in size, mass greater than or equal to 0.32 solar mass. These images and lower resolution measurements also trace a bipolar outflow and gaseous ring, 4.1 by 2.8 x 10<SUP>4</SUP> AU, mass greater than or equal to 0.07 solar mass, radially expanding at 22 +/- 4 km/s. We suggest this ring is a swept-up gaseous torus from an energetic mass ejection stage, possibly an FU Orionis outburst or outburts, approximately 4 x 10<SUP>3</SUP> yr ago that imparted greater than or equal to 10<SUP>45</SUP> ergs into the ambient cloud.

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