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btlgeuse.txt
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1996-01-19
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EMBARGOED UNTIL: 2:45 p.m. (CST) January 15, 1996
PHOTO NO.: STScI-PRC96-04
HUBBLE SPACE TELESCOPE CAPTURES FIRST DIRECT IMAGE OF A STAR
This is the first direct image of a star other than the Sun, made with
NASA's Hubble Space Telescope. Called Alpha Orionis, or Betelgeuse, it
is a red supergiant star marking the shoulder of the winter
constellation Orion the Hunter (diagram at right).
The Hubble image reveals a huge ultraviolet atmosphere with a
mysterious hot spot on the stellar behemoth's surface. The enormous
bright spot, more than ten times the diameter of Earth, is at least
2,000 Kelvin degrees hotter than the surface of the star.
The image suggests that a totally new physical phenomenon may be
affecting the atmospheres of some stars. Follow-up observations will
be needed to help astronomers understand whether the spot is linked to
oscillations previously detected in the giant star, or whether it moves
systematically across the star's surface under the grip of powerful
magnetic fields.
The observations were made by Andrea Dupree of the Harvard- Smithsonian
Center for Astrophysics in Cambridge, MA, and Ronald Gilliland of the
Space Telescope Science Institute in Baltimore, MD, who announced their
discovery today at the 187th meeting of the American Astronomical
Society in San Antonio, Texas.
The image was taken in ultraviolet light with the Faint Object Camera
on March 3, 1995.
Hubble can resolve the star even though the apparent size is 20,000
times smaller than the width of the full Moon -- roughly equivalent to
being able to resolve a car's headlights at a distance of 6,000 miles.
Betelgeuse is so huge that, if it replaced the Sun at the center of our
Solar System, its outer atmosphere would extend past the orbit of
Jupiter (scale at lower left).
Credit: Andrea Dupree (Harvard-Smithsonian CfA), Ronald Gilliland
(STScI), NASA and ESA
Image files in GIF and JPEG format and captions may be accessed on
Internet via anonymous ftp from ftp.stsci.edu in /pubinfo.
GIF JPEG
PRC96-04 Betelgeuse gif/Btlgeuse.gif jpeg/Btlgeuse.jpg
Higher resolution digital versions (300dpi JPEG) of the release
photograph will be available temporarily in /pubinfo/hrtemp:
96-04.jpg.
GIF and JPEG images, captions and press release text are available via
World Wide Web at URL http://www.stsci.edu/pubinfo/PR/96/04.html, or
via links in http://www.stsci.edu/pubinfo/Latest.html and
http://www.stsci.edu/pubinfo/Pictures.html.