Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5804m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #58.04; Bulletin of the American Astronomical Society, Vol. 24, p.1215
Astronomy and Astrophysics
Astronomy
1
Scientific paper
FU Orionis objects (FUors) are characterized by a massive increase in luminosity that probably occurs when a circumstellar disk becomes unstable resulting in an elevated accretion rate. The number of identified FUor outbursts, albeit small, suggests that the phenomenon may be repetitive with a period of 10{(3}) -10{(4}) years. Here we present millimeter-wave aperture synthesis maps of three objects representing different stages in the outburst cycle: the possible pre-outburst object V1331 Cygni, the classic FUor V1057 Cygni, and the spectrally defined FUor RNO 1B which is probably at a late post-outburst stage. There is considerable structure around all three objects and distinct evidence of mass loss. V1331 Cygni is dominated by a ring-like structure, about 4 x 10(4) AU in diameter, and mass 0.1M_&sun;. The structure appears to be expanding at 7 km s(-1) implying a travel time from the star of about 10(4) years, and may be the result of a previous FUor outburst. V1057 Cygni exhibits a bipolar outflow which shows velocity structure but no conclusive sign of the periodic mass loss that would be expected if FUor outbursts are repetitive. RNO 1B is the driving source for a large molecular outflow and is the most embedded object studied. Our maps show extended structure around RNO 1B which may be due to the presence of a companion RNO 1C. We are continuing detailed investigations of the structure of this unusual source.
Blake Geoffrey A.
McMuldroch Stuart
Sargent Anneila I.
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