Results 1 to 10 of about 624,641 (321)

Fast rotating blue stragglers prefer loose clusters [PDF]

Nature Communications, 2023
Blue stragglers are anomalously luminous core hydrogen-burning stars formed through mass-transfer in binary/triple systems and stellar collisions. Their physical and evolutionary properties are largely unknown and unconstrained.
Francesco R. Ferraro, Alessio Mucciarelli, Barbara Lanzoni, Cristina Pallanca, Mario Cadelano, Alex Billi, Alison Sills, Enrico Vesperini, Emanuele Dalessandro, Giacomo Beccari, Lorenzo Monaco, Mario Mateo   +11 more
doaj   +3 more sources

The Formation Rate of Blue Stragglers in 47 Tucanae [PDF]

, 1999
We investigate the effects of changes in the blue straggler formation rate in globular clusters on the blue straggler distribution in the color-magnitude diagram. We find that the blue straggler distribution is highly sensitive to the past formation rate.
Alison Sills, Auriere M., Charles D. Bailyn, Ferraro F., Peter D. Edmonds, Ronald L. Gilliland   +5 more
arxiv   +7 more sources

Blue straggler production in globular clusters [PDF]

Mon.Not.Roy.Astron.Soc. 349 (2004) 129, 2004
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
M. B. Davies, G. Piotto, F. De Angeli
arxiv   +10 more sources

Formation Channels for Blue Straggler Stars [PDF]

, 2014
In this chapter we consider two formation channels for blue straggler stars: 1) the merger of two single stars via a collision, and 2) those produced via mass transfer within a binary. We review how computer simulations show that stellar collisions are likely to lead to relatively little mass loss and are thus effective in producing a young population ...
Davies, Melvyn B.
arxiv   +7 more sources

Blue Stragglers After the Main Sequence [PDF]

The Astrophysical Journal, 2008
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.
Alison Sills, Amanda Karakas, Beccari, Charbonnel, Dearborn, Ferraro, Ferraro, Ferraro, Frost, Hansen, Hut, Iben, John Lattanzio, Lombardi, McCarthy, Monkman, Reimers, Sandquist, Schoenberner, Sills, Sills, Sills, Straniero   +22 more
core   +7 more sources

Blue Stragglers in Low-Luminosity Star Clusters [PDF]

Astrophys.J.635:L73-L76,2005, 2005
We examine the blue straggler populations of 13 low-luminosity (M_V_t >~ -6) globular clusters and 2 old open clusters. These clusters test blue straggler formation in environments intermediate between higher luminosity (and usually higher density) clusters and the Galactic field. The anti-correlation between the relative frequency of blue stragglers
Eric L. Sandquist, Ferraro F. R.
arxiv   +8 more sources

Explaining the Praesepe blue straggler HD 73666 [PDF]

Astronomy and Astrophysics, 2009
The blue straggler phenomenon is not yet well explained by current theory; however, evolutionary models of star clusters call for a good knowledge of it.
Adams, Ahumada, Ahumada, Andrievsky, Asplund, Bailyn, Baumgardt, Benz, Burkhart, Charbonneau, Chen, Chen, Clampitt, Conti, de Marchi, Dias, Donati, Fossati, Fossati, Girardi, Glebbeek, González-Garcá, Hartkopf, J. Landstreet, Johnson, Kawka, Kharchenko, Kharchenko, Knigge, Kraus, Kurucz, L. Fossati, Leonard, Leonard, Lombardi, Lombardi, Lombardi, Madsen, Mason, McAlister, Mermilliod, Mermilliod, Piotto, Portegies Zwart, Prada Moroni, Robichon, S. Mochnacki, Sandage, Sandquist, Shetrone, Shulyak, Sills, Sills, Sills, Sills, Talon, Van den Bergh, W. Weiss, Wade, Wang   +59 more
core   +7 more sources

A Binary Origin for Blue Stragglers in Globular Clusters [PDF]

Nature, 457, 288 (2008), 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.
C. Knigge, Nathan W. C. Leigh, Alison Sills   +2 more
arxiv   +9 more sources

Multiple stellar populations and their influence on blue stragglers [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
It has become clear in recent years that globular clusters are not simple stellar populations, but may host chemically distinct sub-populations, typically with an enhanced helium abundance. These helium-rich populations can make up a substantial fraction
Alexander, Alison Sills, Anders, Angulo, Bedin, Buchler, Böhm-Vitense, Campbell, Cassisi, Chen, Chen, Chen, D'Antona, D'Ercole, De Mink, Dearborn, Decressin, Eggleton, Eggleton, Eldridge, Evert Glebbeek, Ferraro, Ferraro, Ferraro, Formicola, Fujimoto, Fusi Pecci, Glebbeek, Glebbeek, Gratton, Han, Harris, Herwig, Härm, Iben, Iglesias, Kippenhahn, Kippenhahn, Knigge, Kroupa, Leigh, Leigh, Lejeune, Lejeune, Lombardi, Lombardi, Milone, Mocák, Nathan Leigh, Pancino, Piotto, Piotto, Piotto, Pols, Pols, Portegies Zwart, Refsdal, Renzini, Sandage, Saviane, Schlegel, Schröder, Schröder, Sills, Sills, Sills, Sills, Stancliffe, Stancliffe, Ventura, Ventura, Ventura, Ventura, Walker   +73 more
core   +5 more sources

Blue straggler stars in dwarf spheroidal galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
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.
Aparicio, Bailyn, Battaglia, Beers, Bellazzini, Benz, Benz, Bonanos, Carney, Carney, Carrera, Chabrier, Davies, Davies, E. Ripamonti, E. Tolstoy, Ferraro, Ferraro, Ferraro, Ferraro, Ferraro, Freeman, Freitag, Fusi Pecci, G. Battaglia, Girardi, Harbeck, Hernandez, Hurley, Hurley, Hurley-Keller, Ideta, Irwin, Irwin, Irwin, Irwin, Irwin, Kleyna, Kleyna, Landolt, Lanzoni, Lanzoni, Lee, Leonard, Lombardi, M. J. Irwin, M. Mapelli, Mapelli, Mapelli, Mateo, Mateo, Mateo, Mayer, McCrea, McMahon, Momany, Monkiewicz, Monkman, Naylor, Piatek, Pols, S. Sigurdsson, Sabbi, Sandage, Sigurdsson, Sigurdsson, Sills, Sills, Sills, Ségall, Tian, Tolstoy, Walker, Warren, Wilkinson, Zaggia, Zinnecker   +76 more
core   +11 more sources