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Astronomers discover stars with carbon atmospheres
11-21-2007 · EurekAlert!Astronomers have discovered white dwarf stars with pure carbon atmospheres. The discovery could offer a unique view into the hearts of dying stars.
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Keywords: astronomers, discover, stars, carbon, atmospheres, astronomer, star, atmosphere
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- UBC astronomers discover how white dwarf stars get their 'kicks'
12-04-2007 · EurekAlert!
University of British Columbia astronomer Harvey Richer and UBC graduate student Saul Davis have discovered that white dwarf stars are born with a natal kick, explaining why these smoldering embers of sun-like stars are found on the edge rather than at the center of globular star clusters.
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- The fine line between stability and instability -- when do gas giants reach the point of no return?
12-05-2007 · EurekAlert!
Astronomers at UCL have identified the point at which a star causes the atmosphere of an orbiting gas giant to become critically unstable. Depending upon their proximity to a host star, giant Jupiter-like planets have atmospheres which are either stable and thin, or unstable and rapidly expanding. The research enables us to work out whether planets in other systems are stable or unstable by using a 3-D model to characterize their atmospheres.
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- Iowa State astronomer helps discover planet that offers clues to Earth's future
09-12-2007 · EurekAlert!
Iowa State University's Steve Kawaler helped an international team of astronomers make the first discovery of a planet orbiting a star near the end of its life. The news provides a preliminary picture of what could be the Earth's destiny in four to five billion years. The discovery will be announced in the Sept. 13 issue of the journal Nature.
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- Hubble yields direct proof of stellar sorting in a globular cluster
10-24-2006 · EurekAlert!
A seven-year study with the NASA/ESA Hubble Space Telescope has provided astronomers with the best observational evidence yet that globular clusters sort out stars according to their mass. Heavier stars slow down and sink to the cluster's core, while lighter stars pick up speed and move across the cluster to its periphery. This process, called "mass segregation," has long been suspected for globular star clusters, but has never before been directly seen in action.
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- New stars shed light on the past
01-08-2007 · EurekAlert!
A new image from the Hubble Space Telescope shows N90, one of the star-forming regions in the Small Magellanic Cloud. The rich populations of infant stars found here enable astronomers to examine star forming processes in an environment that is very different from that in our own Milky Way.
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- Star family seen through dusty fog
03-13-2007 · EurekAlert!
Images made with ESO's New Technology Telescope at La Silla by a team of German astronomers reveal a rich circular cluster of stars in the inner parts of our Galaxy. Located 30,000 light-years away, this previously unknown closely-packed group of about 100,000 stars is most likely a new globular cluster.
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- Chandra discovers cosmic cannonball
11-28-2007 · EurekAlert!
One of the fastest moving stars ever seen has been discovered with NASA's Chandra X-ray Observatory. This cosmic cannonball is challenging theories to explain its blistering speed.Astronomers used Chandra to observe a neutron star, known as RX J0822-4300, over a period of about five years. During that span, three Chandra observations clearly show the neutron star moving away from the center of the Puppis A supernova remnant at over 3 million miles per hour.
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- Computer models suggest planetary and extrasolar planet atmospheres
06-19-2007 · EurekAlert!
The world is abuzz with the discovery of an extrasolar, Earthlike planet around the star Gliese 581 that is relatively close to our Earth at 20 light years away in the constellation Libra.Bruce Fegley, Jr., Ph.D., professor of earth and planetary sciences at Washington University in St. Louis, has worked on computer models that can provide hints to what comprises the atmosphere of such planets and better-known celestial bodies in our own solar system.
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- Rutgers, Penn State astronomy teams discover ancestors of Milky Way-type galaxies
01-08-2008 · EurekAlert!
Rutgers and Penn State astronomers have discovered galaxies in the distant universe that are ancestors of spiral galaxies like our Milky Way. They are quite small -- one-tenth the size and one-twentieth the mass of our Milky Way, and have fewer stars -- one-fortieth as many as are in the Milky Way. Several of these galaxies, sometimes 10 or more, pulled together over the ensuing few billion years to form a single spiral galaxy.
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- Light echoes whisper the distance to a star
02-10-2008 · EurekAlert!
Taking advantage of the presence of light echoes, a team of astronomers have used an ESO telescope to measure, at the 1 percent precision level, the distance of a Cepheid -- a class of variable stars that constitutes one of the first steps in the cosmic distance ladder.
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