Blue stragglers are called so because they are apparently in the process of aging, Legge appears younger than that of the population from which they formed. While they recognized many star clusters, and saw a between the stars, they had never been inside the core of our galaxy.
It was unclear how many blue form. A common theory is that they emerge binary pairs. As more massive star develops and expands, a small star wins the material from its companion. This stirs up hydrogen fuel and causes the star to undergo fusion grew faster. It hurt more and turn blue, as a massive star, young.
The findings support the idea of the central bulge of the milky way has stopped making stars billions of years. He is now the home of stars like the Sun of aging, cooler red dwarfs. There is a blue giant star that ever lived since exploded as one.
Results forthcoming future issue of the Astrophysical Journal. Lead author Clarkson of Indiana University in Bloomington, the University of California, Los Angeles, may 25, will discuss them in more American Astronomical 2011 in Boston.
"Although the bulge milk is by far the closest Galaxy bulge, several aspects of its formation and development of these remain to understand," said Clarkson. "Many details of its star formation history remain controversial. Blue straggler population scope provides two new constraints identified for models of star formation history of the bulge. "
The discovery followed by a survey of seven days in 2006 called the Sagittarius window Eclipsing stars planet search (sweeps). The mourning followed a central bulge of stars 180,000 of the Galaxy is our 26,000 light years from here. The survey is to find a hot Jupiter planets that orbit class-very close to their stars. Thus, the wave team also uncovered 42 blue stars with the brightness difference, typical temperatures for stars young much more stars bulge.
Observations clearly indicates that if there is a young star, baardnim is very small. Not detected in the fly. It was long suspected to live the bulge of the blue, but had not noticed that the stars of the young stars in our Galaxy disk 3000m line of sight to the kernel, confusing, pollute the view.
Astronomers use Hubble to distinguish the motion of the stars of the core population promoted the milky way. Galactic center around the bulge of stars at different than foreground stars. Plot their movement requires a return to the destination fly with Hubble observations were made two years after the first. It was blue with stars and other baardnim have been identified.
"The size of the bashmim field of view is approximately that of human fingernails weight held handy, and within this region, Hubble sees about a quarter of a million stars in the direction of the bulge," said Clarkson. "Only the brilliant image quality and stability of mourning which allowed us to make such a crowded field in this measurement."
Mhalpo 42 candidate blue, researchers evaluated 18 and 37 is genuine. The rest can be a combination of foreground objects, at most, a small population of stars young really bulge.
"The program is designed to identify transiting planets sweeps through small variations of light," said Kailash saao, main researcher of the fly. "So the program can easily identify variability binary pairs, which was a vital question they have passed the certifying blue."
Hubble is a project of international collaboration between NASA, the European Space Agency. Goddard Space Flight Center of NASA bahgora Staten's Green, Maryland, Director of the telescope. Scientific Institute of the space telescope (STScI) conducts Hubble science operations. STScI is enabled for NASA by the Association of universities for research in astronomy (LC). For pictures and more information about the findings, http://www.nasa.gov/hubble : controller and http://hubblesite.org/news/2011/16
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The above story printed materials provided by the Space Telescope Science Institute.
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