To better understand cluster ageing, the team mapped the location of blue straggler
stars in 21 globular clusters, as seen in images from Hubble and the MPG/ESO 2.2-metre telescope at the ESO La Silla Observatory, among other observatories.
" is a novel following Baily Miller, quickly approaching midlife with no real roots she can call her own.
"Basically, in a mass-transfer scenario, the reason one star ends up as a blue straggler
is that its companion dumps mass on it," says Christian Knigge (Southampton University, England).
The extent of the blue straggler
population detected provides two new constraints for models of the star-formation history of the bulge," he stated.
Stars "A puzzling feature of many globular clusters is the presence in them of an appreciable number of fairly hot stars, in apparent defiance of the modern theory of stellar evolution....
Many researchers believe the typical blue straggler
arises from two elderly, lower-mass stars that collided and merged to form a massive, hotter star.
A team of astronomers used Hubble to study the blue straggler
star content in Messier 30, which formed 13 billion years ago and was discovered in 1764 by Charles Messier.
"That means if a given blue straggler
formed with the rest of its star cluster, it should have died billions of years ago," Knigge said.
All of this points to "stellar cannibalism" as the primary mechanism for blue straggler
These stars are so crowded that they can, at times, slam into each other and even form a new star, called a "blue straggler
The largest known concentration of "blue straggler
" stars has astronomers puzzled about what's going on at the center of globular cluster M80 in Scorpius (located at R.A.