, 13 2009 . 00:45
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, Nigel Artingstall.
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Nigel Artingstall,
http://sobakidendy-news.ru/post108163844/
Česlovas Česnakevičius ( ). , . , ?
http://sobakidendy-news.ru/post109346117/
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http://www.liveinternet.ru/community/811999/post109639073/
Lesley Harrison,
http://sobakidendy-news.ru/post109253226/ .
07 2009
, 13 2009 . 14:00
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, - : - COSMOS . Gliese 581d, Gliese 581, 20 .
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amazing-me.ru/article/274.
amazingmeru.
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The Formation of Stars
Cepheus B, a molecular cloud located in our Milky Galaxy about 2,400 light years from the Earth, provides an excellent model to determine how stars are formed. This composite image of Cepheus B combines data from the Chandra X-ray Observatory and the Spitzer Space Telescope.
A molecular cloud is a region containing cool interstellar gas and dust left over from the formation of the galaxy and mostly contains molecular hydrogen. The Spitzer data, in red, green and blue shows the molecular cloud (in the bottom part of the image) plus young stars in and around Cepheus B, and the Chandra data in violet shows the young stars in the field.
The Chandra observations allowed the astronomers to pick out young stars within and near Cepheus B, identified by their strong X-ray emission. The Spitzer data showed whether the young stars have a so-called "protoplanetary" disk around them. Such disks only exist in very young systems where planets are still forming, so their presence is an indication of the age of a star system.
The new study suggests that star formation in Cepheus B is mainly triggered by radiation from one bright, massive star (HD 217086) outside the molecular cloud. According to the particular model of triggered star formation that was tested -- called the radiation- driven implosion (RDI) model -- radiation from this massive star drives a compression wave into the cloud triggering star formation in the interior, while evaporating the cloud's outer layers.
For more information, visit
http://www.nasa.gov/mission_pages/chandra/multimedia/photo09-062.html.
Image Credits X-ray: NASA/CXC/PSU/K. Getman et al.; IRL NASA/JPL-Caltech/CfA/J. Wang et al.
www.nasa.gov/multimedia/imagegallery/image_feature_1444.html
14 2009
, 06 2009 . 20:05
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Kohoutek 4-55 ( K 4-55). NASA
11 2009
, 03 2009 . 14:15
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Hubble Finds Hidden Exoplanet in Archival Data
In 19 years of observations, the Hubble Space Telescope has amassed a huge archive of data--an archive that may contain the telltale glow of undiscovered extrasolar planets. Such is the case with HR 8799b, shown in this artist's concept. The planet is one of three extrasolar planets orbiting the young star HR 8799, which lies 130 light-years away. The planetary trio was originally discovered in images taken with the Keck and Gemini North telescopes in 2007 and 2008. But using a new image processing technique that suppresses the glare of the parent star, scientists found the telltale glow of the outermost planet in the system while studying Hubble archival data taken in 1998. The giant planet is young and hot, but still only 1/100,000th the brightness of its parent star. By comparison, Jupiter is one-billionth the brightness of our sun.
Image Credit: NASA, ESA, and G. Bacon (STScI) http://www.nasa.gov/multimedia/imagegallery/image_feature_1320.html
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02 2009
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