Two distinct sequences of blue straggler stars in the globular cluster M 30
نویسندگان
چکیده
منابع مشابه
Two distinct sequences of blue straggler stars in the globular cluster
Stars in globular clusters are generally believed to have all formed at the same time, early in the Galaxy's history 1. 'Blue stragglers' are stars sufficiently massive 2 that they should have evolved into white dwarfs long ago. Two possible mechanisms have been proposed for their formation: mass transfer between binary companions 3 , and stellar mergers induced by direct collisions between two...
متن کاملHST observations of blue Straggler stars in the core of the globular cluster M 3 ?
The core of the Galactic Globular ClusterM 3 (NGC 5272) has been observed with the WFPC2 through the filters F255W , F336W , F555W , and F814W . Using these observations along with a thorough reanalysis of earlier catalogs, we have produced a catalog of blue straggler stars (BSS) spanning the cluster. Earlier studies and the fainter part of our sample suffer severe selection biases. Our analysi...
متن کاملHst Observations of Blue Straggler Stars in the Core of the Globular
The core of the Galactic Globular Cluster M3 (NGC 5272) has been observed with the WFPC2 through the filters F255W , F336W , F555W , and F814W . Using these observations along with a thorough reanalysis of earlier catalogs, we have produced a catalog of blue straggler stars (BSS) spanning the cluster. Earlier studies and the fainter part of our sample suffer severe selection biases. Our analysi...
متن کاملBlue straggler production in globular clusters
Recent HST observations of a large sample of globular clusters reveal that every cluster contains between 40 and 400 blue stragglers. The population does not correlate with either stellar collision rate (as would be expected if all blue stragglers were formed via collisions) or total mass (as would be expected if all blue stragglers were formed via the unhindered evolution of a subset of the st...
متن کاملBlue straggler stars in dwarf spheroidal galaxies
Blue straggler star (BSS) candidates have been observed in all old dwarf spheroidal galaxies (dSphs), however whether or not they are authentic BSSs or young stars has been a point of debate. To both address this issue and obtain a better understanding of the formation of BSSs in different environments we have analysed a sample of BSS candidates in two nearby Galactic dSphs, Draco and Ursa Mino...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 2009
ISSN: 0028-0836,1476-4687
DOI: 10.1038/nature08607