Herschel Reveals Ripening Stars Near Rosette Nebula

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Whitney Clavin 818-354-4673
Jet Propulsion Laboratory, Pasadena, Calif.
whitney.clavin@jpl.nasa.gov

NEWS RELEASE: 2010-122 April 12, 2010

Herschel Reveals Ripening Stars Near Rosette Nebula

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.cfm?release=2010-122&cid=release_2010-122

The Herschel Space Observatory has uncovered a cosmic garden of budding stars, each
expected to grow to 10 times the mass of our sun.

The new image can be seen online at
http://www.nasa.gov/mission_pages/herschel/hersch20100412a.html . It was taken using
infrared light by Herschel, a European Space Agency mission with important NASA
participation.

"Herschel can see through cold thickets of dust to where big, baby stars are forming," said
Paul Goldsmith, the NASA project scientist for the mission at NASA's Jet Propulsion
Laboratory, Pasadena, Calif.

The image shows most of the cloud associated with the Rosette nebula, located about
5,000 light-years from Earth in the constellation Monoceros, the Unicorn. The region
contains a family of growing stars, with the oldest and most massive members in the
center of the nebula, and younger and less massive generations located farther out in the
associated cloud. The nebula's cluster of the most massive stars, located beyond the right
edge of the picture, is responsible for hollowing out the cavity. There's enough dust and
gas in the entire Rosette cloud to make about 10,000 suns.

The large, embryonic stars uncovered by Herschel are thought to be a younger generation.
They are located inside the tips of pillars that appear to branch out from thicker cloud
material. The pillars were, in fact, excavated by the nebula's massive star cluster. Winds
and radiation from those stars pushed less dense material away from the pillars, and
probably triggered the birth of the big stars inside the finger-like structures. In fact, the
pillars point to the location of the massive nebula stars.

The intermediate-mass stellar embryos, each a couple of times as massive as the sun, are
located in the redder regions of the image. The small spots near the center of the image
are lower-mass embryonic stars, similar in mass to the sun.

Astronomers study regions like the Rosette not only to learn how stars form in our Milky
Way, but also to get a better idea of what's going on in distant galaxies. When
astronomers look at faraway galaxies, they are seeing light from regions that are bursting
with massive stars. In order to compare our galaxy to distant ones, it is therefore
important to understand high-mass star formation.

Herschel collects the infrared light from dust. The infrared light is color-coded as follows:
light with a wavelength of 70 microns is blue; 160-micron light is green; and 250-micron
light is red. The observations were made with Herschel's Photoconductor Array Camera
and Spectrometer and the Spectral and Photometric Imaging Receiver instruments.

The principal investigator of this research is Frédérique Motte of the French National
Center of Scientific Research and Atomic and Alternative Energies Center, Paris-Saclay,
France (see http://hobys-herschel.cea.fr ). Motte was a postdoctoral fellow at the
California Institute of Technology in Pasadena.

Herschel is a European Space Agency cornerstone mission, with science instruments
provided by a consortia of European institutes and with important participation by
NASA. NASA's Herschel Project Office is based at JPL. JPL contributed mission-
enabling technology for two of Herschel's three science instruments. The NASA Herschel
Science Center, part of the Infrared Processing and Analysis Center at Caltech in
Pasadena, supports the U.S. astronomical community. Caltech manages JPL for NASA.

More information is online at http://www.herschel.caltech.edu ,
http://www.nasa.gov/herschel and
http://www.esa.int/SPECIALS/Herschel/index.html .

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