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Overview of the Orion Complex
John Bally
The Orion star formation complex is the nearest region of on-going star formation that continues to produce both low and high mass stars. Orion is discussed in the larger context o…
Photoevaporation of Protoplanetary Disks
Z. Balog, G. H. Rieke, J. Muzerolle +4
We present HST/NICMOS Paschen alpha images and low and high resolution IRS spectra of photoevaporating disk-tail systems originally detected at 24 micron near O stars. We find no P…
`Tail-end' Bondi-Hoyle accretion in young star clusters: Implications for disks, planets, and stars
Henry B. Throop, John Bally
Young stars orbiting in the gravitational potential well of forming star clusters pass through the cluster's dense molecular gas and can experience Bondi-Hoyle accretion from reser…
Outflows from Massive Stars
John Bally
The properties of outflows powered by massive stars are reviewed with an emphasis on the nearest examples, Orion and Cepheus-A. The Orion OMC1 outflow may have been powered by the…
Visual Binaries in the Orion Nebula Cluster
Bo Reipurth, Marcelo M. Guimarães, Michael S. Connelley +1
We have carried out a major survey for visual binaries towards the Orion Nebula Cluster using HST images obtained with an H-alpha filter. Among 781 likely ONC members more than 60"…
And in the Darkness Bind Them: Equatorial Rings, B[e] Supergiants, and the Waists of Bipolar Nebulae
Nathan Smith, John Bally, Josh Walawender
We report the discovery of two new circumstellar ring nebulae in the western Carina Nebula. The brighter object, SBW1, resembles a lidless staring eye and encircles a B1.5 Iab supe…