Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118..960s&link_type=abstract
The Astronomical Journal, Volume 118, Issue 2, pp. 960-971.
Astronomy and Astrophysics
Astronomy
20
Stars: Binaries: Close, Stars: Binaries: Eclipsing, Stars: Circumstellar Matter, Stars: Individual (Ry Scuti), Stars: Mass Loss, Stars: Winds, Outflows
Scientific paper
We present HST Wide Field Planetary Camera 2 images of the very massive eclipsing binary RY Scuti. The HST Hα image shows a very complex ionized nebula roughly 1" in size. Several interesting structures are revealed, including what appears to be a pair of concentric ionized rings above and below the equatorial plane of the system, located at the inner edge of a more extended dust torus. We reexamine some essential physical characteristics of the nebula, such as a possible magnetic field and the complicated mass-loss geometry of this near-Eddington limit contact binary. The effects of a rotating illumination source are considered to explain the brightness distribution in the rings. We suggest a model for the origin of the mass and detailed structure in the nebula. This model invokes a previous mass ejection that is shaped by nonspherical interacting winds and possibly magnetic fields.
Davidson Kris
Gehrz Robert D.
Humphreys Roberta M.
Jones Terry J.
Krautter Joachim
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