Results 11 to 20 of about 4,313 (174)

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, LOVISI, LOREDANA, FERRARO, FRANCESCO ROSARIO, DALESSANDRO, EMANUELE, LANZONI, BARBARA, Monaco, L.   +5 more
openaire   +2 more sources

Blue Straggler Stars in Galactic Open Clusters and the effect of field star contamination [PDF]

, 2008
We investigate the distribution of Blue Straggler stars in the field of three open star clusters. The main purpose is to highlight the crucial role played by general Galactic disk fore-/back-ground field stars, which are often located in the same region ...
A. Moitinho, Ahumada, Ann, Bellazzini, Bellazzini, Burton, Carraro, Carraro, De Marchi, Dias, Ferraro, G. Carraro, Gim, Girardi, Guarnieri, Moitinho, Momany, Pandey, Phelps, Piotto, R. A. Vázquez, Russeil, Sandage, Schlegel, Villanova, Vázquez, Xin, Xu   +27 more
core   +5 more sources

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, S. M. Andrievsky, J. S. Drilling   +2 more
openaire   +1 more source

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, Leigh, Nathan, Sills, Alison   +2 more
openaire   +4 more sources

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
openaire   +1 more source

The origins of blue stragglers and binarity in globular clusters [PDF]

Monthly Notices of the Royal Astronomical Society, 2012
(abridged) We use newly available empirical binary fractions for globular clusters to carry out a direct test of the binary evolution hypothesis, and of collisional channels that involve binary stars. More specifically, using the previously reported correlation between blue straggler numbers and core mass as a benchmark, we test for correlations with ...
Leigh, N., Knigge, C., Sills, A., Perets, H.B., Sarajedini, A., Glebbeek, E.   +5 more
openaire   +3 more sources

Chemical composition of a palomar 12 blue straggler

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT With the equivalent area of a 16-m telescope, ESPRESSO in 4UT mode allows to inaugurate high resolution spectroscopy for solar-type stars belonging to extragalactic globular clusters. We determine the chemical composition of an extragalactic blue straggler (BS).
L Pasquini, P Bonifacio, L Pulone, A Modigliani, E Brocato, L Sbordone, S Randich, G Cupani   +7 more
openaire   +4 more sources

Blue Straggler Stars in Globular Clusters: a powerful tool to probe the internal dynamical evolution of stellar systems [PDF]

, 2014
This chapter presents an overview of the main observational results obtained to date about Blue Straggler Stars (BSSs) in Galactic Globular Clusters (GCs).
A. Dotter, A. Marín-Franch, A. Moretti, A. Mucciarelli, A. P. Milone, A. Pietrinferni, A. R. Sandage, A. Renzini, A. Sarajedini, A. Sarajedini, A. Sills, A. Sills, A. Sollima, B. Lanzoni, B. Lanzoni, B. Lanzoni, B. Lanzoni, B. Lanzoni, B. Tian, C. D. Bailyn, C. Knigge, D. C. Heggie, D. E. McLaughlin, D. Quievy, E. Carretta, E. Dalessandro, E. Dalessandro, E. Dalessandro, E. Sabbi, F. Fusi Pecci, F. Paresce, F. R. Ferraro, F. R. Ferraro, F. R. Ferraro, F. R. Ferraro, F. R. Ferraro, F. R. Ferraro, F. R. Ferraro, F. R. Ferraro, F. R. Ferraro, G. Beccari, G. Beccari, G. Fiorentino, G. Meylan, G. Piotto, J. Anderson, J. C. Lombardi Jr, J. G. Hills, K. Jordi, L. Lovisi, L. Lovisi, L. Lovisi, L. Lovisi, M. Auriere, M. B. Davies, M. Bolte, M. J. Sarna, M. M. Shara, M. Mapelli, M. Mapelli, M. Mapelli, M. Monelli, N. Leigh, N. Leigh, N. Leigh, O. Marco De, P. Cariulo, P. Guhathakurta, P. J. T. Leonard, R. Buonanno, R. Contreras Ramos, R. D. Mathieu, R. L. Gilliland, R. Zinn, S. Djorgovski, S. Djorgovski, S. Lucatello, S. R. Warren, S. Sigurdsson, W. Benz, W. H. McCrea   +80 more
core   +2 more sources

The Blue Straggler Population of the Globular Cluster M5 [PDF]

The Astrophysical Journal, 2007
By combining high-resolution HST and wide-field ground based observations, in ultraviolet and optical bands, we study the Blue Stragglers Star (BSS) population of the galactic globular cluster M5 (NGC 5904) from its very central regions up to its periphery. The BSS distribution is highly peaked in the cluster center, decreases at intermediate radii and
LANZONI, BARBARA, DALESSANDRO, EMANUELE, FERRARO, FRANCESCO ROSARIO, Mancini C., BECCARI, GIACOMO, Rood R. T., Mapelli M., Sigurdsson S.   +7 more
openaire   +4 more sources

Composition Mixing during Blue Straggler Formation and Evolution [PDF]

, 1996
We use smoothed-particle hydrodynamics to examine differences between direct collisions of single stars and binary star mergers in their roles as possible blue straggler star formation mechanisms.
Eggleton P. P., Eric L. Sandquist, Gratton R. G., Jorgensen H. E., Jorgensen H. E., Kaluzny J., Lars Hernquist, Lauzeral C., Lauzeral C., Mateo M., Mathys G., Michael Bolte, Monaghan J. J., Monaghan J. J., Niss B., Seaton M. J., Yan L.   +16 more
core   +3 more sources