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Doug Johnstone's Orion Page

Orion Nebula Research


This research was conducted by Doug Johnstone, currently an Assistant Professor in the Department of Astronomy at the University of Toronto, while an NSERC post-doctoral fellow at CITA, the Canadian Institute for Theoretical Astrophysics.

Click here to go directly to the Orion Nebula Images.



Since 17 January 1997 there have been  LOTS of visitors to this page.


Scientific Papers:


Photoevaporation of Disks and Clumps By Nearby Massive Stars:

Application to Disk Destruction in the Orion Nebula

Johnstone, Hollenbach, and Bally 1988, ApJ, 499, 758.

Click for the abstract, or for the full text in gzipped postscript or pdf.

Externally Illuminated Young Stellar Environments in the Orion Nebula:

Hubble Space Telescope Planetary Camera and UV Observations

Bally, Sutherland, Devine, and Johnstone 1998, AJ, 116, 293

Click for the abstract, or for the full text in gzipped postscript or pdf.

Copies of individual figures from this paper are available from John Bally.

Ultraviolet Radiation and Circumstellar Environments

Johnstone and Bertoldi for publication in The Orion Nebula Revisited (1998).

Click for the abstract, or for the full text in gzipped postscript.


Destruction of Circumstellar Disks In Orion's Trapezium Explained

Press Release:

(Released January 14th at 9:20a.m. EST)

The following figures were part of a press release in 1997. The first two figures were included in the press kit and the others are included here for those who would like access for press purposes.

Click here for the Press Release.



Figures and Captions:

Scroll down through the images of the Orion Nebula taken with HST. Following each image is a descriptive fiugre caption and links for downloading the image for personal use. Please notify Doug Johnstone.

The Trapezium core.

Figure 1: The core of the Trapezium showing the four energetic massive stars and a plethora of Sun-like stars with surrounding extended emission. The Trapezium is located in the center of the Orion nebula seen here as a blue background glow. Note how the material surrounding the Sun-like stars produces a cometary structure with a bright head and a tail pointing directly away from the energetic central massive stars.

This false color mosaic, made by combining multiple Hubble Space Telescope images, was presented to the American Astronomical Society meeting in Toronto, Canada on January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

Click to download figure in jpeg format.

Click to download figure in tiff format.


HST 10 and company.

Figure 2: A false color image of the teardrop shaped HST 10 star-disk system and immediate neighbors, a silhouetted disk (top left) and a second star-disk system (bottom right). At the center of HST 10 lies a dark nearly edge on disk with a diameter approximately the same as Pluto's orbit. Surrounding the system is diffuse hot gas which has been evaporated from the disk surface. We are witnessing the destruction of a circumstellar disk which if otherwise left alone would be a strong candidate for producing planets.

This false color image, produced by combining three Hubble Space Telescope images, was presented to the American Astronomical Society meeting in Toronto, Canada on January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

Click to download figure in jpeg format.

Click to download figure in tiff format.


A gallery of star-disk systems..

Figure 3: A gallery of star-disk systems in Orion's Trapezium. The first four objects are being evaporated by the central massive stars, while the last two disks are visible in silhouette against the background nebula.

This false color image, produced by combining Hubble Space Telescope images, was presented to the American Astronomical Society meeting in Toronto, Canada on January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

Click to download figure in jpeg format.

Click to download figure in tiff format.


The Trapezium Region (full mosaic).

Figure 4: An extended view of the Trapezium showing the four energetic massive stars and a plethora of Sun-like stars with surrounding extended emission. The Trapezium is located in the center of the Orion nebula seen here as a blue background glow. Note how the material surrounding the Sun-like stars produces a cometary structure with a bright head and a tail pointing directly away from the energetic central massive stars.

This false color mosaic, made by combining multiple Hubble Space Telescope images, was presented to the American Astronomical Society meeting in Toronto, Canada on January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

Click to download figure in jpeg format.

Click to download figure in tiff format.


The center of the Trapezium cluster.

Figure 5: The center of the Trapezium cluster showing the four massive energetic stars and a number of evaporating proto-planetary disks.

This false color mosaic, made by combining multiple Hubble Space Telescope images, was presented to the American Astronomical Society meeting in Toronto, Canada on January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

Click to download figure in jpeg format.

Click to download figure in tiff format.


The center of the Trapezium cluster.

Figure 6: The center of the Trapezium cluster showing the four massive energetic stars and a number of evaporating proto-planetary disks.

This false color mosaic, made by combining multiple Hubble Space Telescope images, was presented to the American Astronomical Society meeting in Toronto, Canada on January 14th, 1997. PHOTO CREDIT: John Bally, Dave Devine, and Ralph Sutherland.

Click to download figure in jpeg format.

Click to download figure in tiff format.


To Doug Johnstone's Scientific Home Page
Last updated: October 22, 1999.
(johnstone@astro.utoronto.ca)