Results 11 to 20 of about 290 (259)
BLUE STRAGGLERS AFTER THE MAIN SEQUENCE [PDF]
The Astrophysical Journal, 2009 We study the post-main sequence evolution of products of collisions between main sequence stars (blue stragglers), with particular interest paid to the horizontal branch and asymptotic giant branch phases. We found that the blue straggler progeny populate the colour-magnitude diagram slightly blueward of the red giant branch and between 0.2 and 1 ...
Sills, A. +2 more
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BD+43° 3654 – a blue straggler? [PDF]
Astronomy & Astrophysics, 2008 4 pages, 1 figure, accepted for publication in A&A ...
Gvaramadze, V. V., Bomans, D. J.
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The Astrophysical Journal, 2023 We have used the “dynamical clock” to measure the level of dynamical evolution reached by three Galactic globular clusters (namely, NGC 3201, NGC 6316, and NGC 6440).
Francesco R. Ferraro +5 more
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Building Blue Stragglers with Stellar Collisions [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractThe evolution of stellar collision products in cluster simulations has usually been modelled using simplified prescriptions. Such prescriptions either replace the collision product with an (evolved) main sequence star, or assume that the collision product was completely mixed during the collision.It is known from hydrodynamical simulations of ...
Glebbeek, E., Pols, O.R.
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SPINNING LIKE A BLUE STRAGGLER: THE POPULATION OF FAST ROTATING BLUE STRAGGLER STARS IN ω CENTAURI [PDF]
The Astrophysical Journal, 2014 By using high-resolution spectra acquired with FLAMES-GIRAFFE at the ESO/VLT, we measured radial and rotational velocities for 110 Blue Straggler stars (BSSs) in Omega Centauri, the globular cluster-like stellar system harboring the largest known BSS population. According to their radial velocities, 109 BSSs are members of the system.
MUCCIARELLI, ALESSIO +5 more
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A binary origin for ‘blue stragglers’ in globular clusters [PDF]
Nature, 2009 Blue stragglers in globular clusters are abnormally massive stars that should have evolved off the stellar main sequence long ago. There are two known processes that can create these objects: direct stellar collisions and binary evolution. However, the relative importance of these processes has remained unclear.
Knigge, Christian +2 more
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Blue stragglers in open clusters [PDF]
Astronomy & Astrophysics, 2001 We performed for the rst time a detailed LTE spectroscopic study of a sample of blue straggler stars in the moderately old open cluster NGC 7789. For eight stars the parameters and abundances of several elements were determined. The cluster members show a remarkable surface magnesium deciency which is quite unusual for late B - early A stars.
D. Schönberner +2 more
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The lithium abundance of M67 blue stragglers - A constraint on the blue straggler phenomenon
The Astrophysical Journal, 1991 Upper limits have been placed on the line strength of the 6707 A Li I resonance doublet in seven blue stragglers in M67. The corresponding upper limits on abundances range from log N(Li) less than about 1.3 to less than about 2.3. This result is significantly below the level of log N(Li) about 3.1 + or {minus} 0.1 found in field main-sequence stars of ...
C. J. Pritchet, J. W. Glaspey
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WOCS 4540: Detailed Analysis of a very Long Orbital Period Blue Straggler
The Astrophysical Journal, 2023 WOCS 4540 is the longest orbital period ( P _orb = 3030 days) blue straggler star (BSS)—white dwarf (WD) pair in the old open cluster NGC 188. It also contains one of the most luminous BSS in the cluster.
Meng Sun, Robert D. Mathieu
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Blue Straggler Formation in Clusters [PDF]
AIP Conference Proceedings, 2010 Blue stragglers are thought to be formed from the merger or coalescence of two stars, but the details of their formation in clusters has been difficult to disentangle. We discuss the two main formation mechanisms for blue stragglers (stellar collisions or mass transfer in a binary system).
Alison Sills +2 more
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