McNeil's Last Gasp: A Brief Post-Outburst Wind from V1647 Ori

Details McNeil's Last Gasp: A Brief Post-Outburst Wind from V1647 Ori McNeil's Last Gasp: A Brief Post-Outburst Wind from V1647 Ori

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8707b&link_type=abstract

American Astronomical Society Meeting 210, #87.07; Bulletin of the American Astronomical Society, Vol. 39, p.198

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new observations of the fundamental ro-vibrational CO spectra from V1647 Ori, the star whose recent outburst illuminated McNeil's Nebula. The spectra were acquired shortly after the luminosity of the source returned to its pre-outburst level (February 2006) and roughly one year later (December 2006 & February 2007). The CO lines evolved from centrally peaked emission lines during the outburst to P Cygni lines immediately following the outburst and back again to centrally peaked emission lines. We use a standard disk-magnetosphere interaction model to interpret the observations. The model predicts a decreasing truncation radius of the disk with increasing accretion rate. When the truncation radius of the disk moves radially inward or outward in response to changes in the accretion rate, the magnetic field must reorganize, leading to an enhanced reconnection rate. Such activity is expected to launch outflows, which have been observed at the onset and completion of the outburst of the system. We show that these trends are consistent with the fact that V1647 Ori produced a fast and hotter Hα outflow at the onset of the outburst whereas a slower, cooler CO outflow manifested itself as the system approached quiescence. This remarkable phenomenon provides further insight to how the disk and a stressed magnetosphere can generate disk driven winds.
S.D.B. performed this work in part with support from the Michelson Fellowship Program. The data presented herein were obtained [in part] at the W.M. Keck Observatory and Gemini South Telescope. The Phoenix spectra were obtained as part of program GS-2006A-DD-1 and GS-2006B-DD-1.

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