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Published December 1993 | Published
Journal Article Open

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


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

Additional Information

© 1993 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1993 July 14. We are indebted to the staff of the Owens Valley millimeter-wave array and the Caltech Submillimeter Observatory for their unfailing support, and extend special thanks to Taco for his assistance with the CSO mapping software. We are grateful to N. Weir and J. Eislöffel for kindly supplying optical images. S. M. thanks D. Koerner for many illuminating and stimulating discussions and for supplying the SED code. Astronomy with the Owens Valley Array is funded by NSF Grant No. AST 90-16404 and the CSO by NSF Grant No. AST 90-15755. S. M. is supported by NASA Grant Nos. NAGW-3172 and NAGW-2297, part of the Origins of Solar Systems Research Program.

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