Molecular outflows from FU Orionis stars

Details Molecular outflows from FU Orionis stars Molecular outflows from FU Orionis stars

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..793e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 793-799

Astronomy and Astrophysics

Astronomy

37

Carbon Monoxide, Interstellar Gas, Jet Flow, Molecules, Radio Astronomy, Radio Spectra, T Tauri Stars, Variable Stars, Infrared Sources (Astronomy), Momentum, Optical Correction Procedure, Optical Thickness, Radio Telescopes

Scientific paper

We have detected molecular outflows toward six out of eight FU Orionis stars that we observed in the J = 3-2 line of CO. Notably, FU Orionis itself does not show an outflow. Four of the souces were mapped, and two show evidence for multiple outflows. In both Z CMa and RNO 1b, nearby infrared sources may also be driving the outflows. Mass-loss rates derived from the usual assumptions of momentum conservation range from 3 x 10-8 solar masses/yr to 2 x 10-6 solar masses/yr without corrections for optical depth in the CO lines. Corrections for optical depth raise these estimates by a factor of 5 on average. If the outflows are driven by repeated outbursts with peak mass-loss rates of 10-5 solar masses/yr, a duty cycle of 10-3 to 10-1 would be implied, consistent with other recent evidence.

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