Contribution of Primordial Binary Evolution to the Two Blue-straggler Sequences in Globular Cluster M30
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...
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We report the discovery of two binary millisecond pulsars in the core-collapsed globular cluster M30 using the Green Bank Telescope (GBT) at 20 cm. PSR J2140−2310A (M30A) is an eclipsing 11-ms pulsar in a 4-hr circular orbit and PSR J2140−23B (M30B) is a 13-ms pulsar in an as yet undetermined but most likely highly eccentric (e> 0.5) and relativistic orbit. Timing observations of M30A with a 20...
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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...
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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 کاملPrimordial binary evolution and blue stragglers
Blue stragglers can significantly enhance the spectral energy toward short wavelengths, especially in ultraviolet and blue bands. Much evidence shows that blue stragglers are relevant to primordial binaries. In this paper, we systematically studied blue stragglers produced from primordial binary evolution via a binary population synthesis approach, and examined their contribution to the integra...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2017
ISSN: 1538-4357
DOI: 10.3847/1538-4357/aa8ee1