Results 111 to 120 of about 3,207 (171)

The Blue Straggler Star Populations in Galactic Globular Clusters

, 2017
The puzzling existence of Blue Straggler Stars (BSSs) implies that they must form in relatively recent events, after the majority of the constituent globular cluster (GC) stellar population was formed. In this thesis we compile a large set of independent work to help understand the formation of BSSs.
openaire   +3 more sources

WIYN Open Cluster Study. XC. Barium Surface Abundances of Blue Straggler Stars in the Open Clusters NGC 7789 and M67

The Astrophysical Journal
We investigate barium (Ba) abundances in blue straggler stars (BSSs) in two open clusters, NGC 7789 (1.6 Gyr) and M67 (4 Gyr), as signatures of asymptotic-giant-branch (AGB) mass transfer.
Andrew C. Nine, Robert D. Mathieu, Simon C. Schuler, Katelyn E. Milliman   +3 more
doaj   +1 more source

Variability in the Massive Open Cluster NGC 1817 from K2: A Rich Population of Asteroseismic Red Clump, Eclipsing Binary, and Main-sequence Pulsating Stars. [PDF]

Astron J, 2020
Sandquist EL, Stello D, Arentoft T, Brogaard K, Grundahl F, Vanderburg A, Hedlund A, DeWitt R, Ackerman TR, Aguilar M, Buckner AJ, Juarez C, Ortiz AJ, Richarte D, Rivera DI, Schlapfer L.   +15 more
europepmc   +1 more source

The Frequency of Binary Stars in the Core of 47 Tucanae

, 2001
Differential time series photometry has been derived for 46422 main-sequence stars in the core of 47 Tucanae. The observations consisted of near-continuous 160-s exposures alternating between the F555W and F814W filters for 8.3 days in 1999 July with ...
Alard C., Ata Sarajedini, Bacon D., Belloni T., Bertelli G., Bopp B. W., Callanan P. J., Cutispoto G., Davies M. B., Duquennoy A., Elson R. A. W., Heggie D. C., Heggie D. C., Kaluzny J., Kaluzny J., Kaluzny J., Keppens R., Keppens R., Mathieu R. D., Menzies J. W., Meylan G., Michael D. Albrow, Peter D. Edmonds, Portegies Zwart S. F., Puragra Guhathakurta, Rahunen T., Robertson J. A., Ronald L. Gilliland, Timothy M. Brown, van den Berg M., Vilhu O., Yan L.   +31 more
core   +1 more source

Characterization of the Blue Straggler Star Populations, through Statistical, Photometric, and Spectral Energy Distribution Analysis, in the Old Open Cluster: NGC 2243

The Astronomical Journal
We present a statistical, photometric, and spectral energy distribution (SED) analysis of the poorly studied old open cluster: NGC 2243, to characterize its blue straggler star (BSS) population.
A. H. Sheikh, Biman J. Medhi
doaj   +1 more source

Dynamical Processes in Globular Clusters

, 2014
Globular clusters are among the most congested stellar systems in the Universe. Internal dynamical evolution drives them toward states of high central density, while simultaneously concentrating the most massive stars and binary systems in their cores ...
A. Ahmad, A. C. Fabian, A. D’Ercole, A. D’Ercole, A. Karakas, A. P. Milone, A. Renzini, A. Tanikawa, A. Whitehead, B. Gao, B. Moore, C. Einsel, D. Bacon, D. C. Heggie, D. C. Heggie, D. C. Heggie, D. C. Heggie, D. F. Chernoff, D. Lynden-Bell, D. Lynden-Bell, E. Bettwieser, E. Carretta, E. Gaburov, E. Gaburov, E. Vesperini, E. Vesperini, E. Vesperini, F. I. Pelupessy, F. I. Pelupessy, G. A. Drukier, G. D. Quinlan, G. Kupi, G. Piotto, G. Piotto, H. Baumgardt, H. Baumgardt, H. C. Plummer, H. Cohn, H. Cohn, H. Cohn, I. R. King, J. Barnes, J. Binney, J. C. Lombardi, J. E. Grindlay, J. G. Hills, J. G. Hills, J. Goodman, J. Goodman, J. M. Fregeau, J. M. Fregeau, J. M. Fregeau, J. Makino, J. Makino, J. Makino, J. R. Hurley, J. R. Hurley, J. R. Hurley, J. S. Stodolkiewicz, J. S. Stodolkiewicz, K. Bekki, K. J. Joshi, K. Nitadori, K. Nitadori, K. Takahashi, K. Takahashi, K. Takahashi, K. Takahashi, L. J. Spitzer, L. Spitzer, L. Spitzer, M. A. Gürkan, M. Freitag, M. Freitag, M. Freitag, M. Fujii, M. Giersz, M. Giersz, M. Giersz, M. Giersz, M. Giersz, M. Giersz, M. Giersz, M. Giersz, M. Hénon, N. Prantzos, P. Hut, P. Hut, P. Hut, P. Kroupa, P. L. Cottrell, P. P. Eggleton, R. Capuzzo-Dolcetta, R. G. Belleman, R. Spurzem, S. Deiters, S. E. Mink de, S. F. Portegies Zwart, S. F. Portegies Zwart, S. F. Portegies Zwart, S. F. Portegies Zwart, S. F. Portegies Zwart, S. F. Portegies Zwart, S. F. Portegies Zwart, S. Inagaki, S. J. Aarseth, S. L. W. McMillan, S. L. W. McMillan, S. L. W. McMillan, S. Portegies Zwart, T. Decressin, T. Decressin, T. Ebisuzaki, T. Fukushige, T. Fukushige, V. A. Antonov, W. Benz, W. Dehnen   +117 more
core   +1 more source

A Kinematic View of NGC 1261: Structural Parameters, Internal Dispersion, Absolute Proper Motion, and Blue Straggler Stars [PDF]

, 2020
Silvia Raso, Mattia Libralato, Andrea Bellini, F. R. Ferraro, B. Lanzoni, Mario Cadelano, Cristina Pallanca, E. Dalessandro, G. Piotto, Jay Anderson, Sangmo Tony Sohn   +10 more
openalex   +1 more source

Discovery of a Second Eclipsing, ​​​​​Bursting Neutron Star Low-mass X-Ray Binary in the Globular Cluster Terzan 6

The Astrophysical Journal
We have analyzed Chandra and Suzaku observations of the globular cluster Terzan 6, made when the recurrent transient GRS 1747–312 was in quiescence. Our analysis reveals the presence of a second eclipsing, bursting neutron star low-mass X-ray binary in ...
Maureen van den Berg, Jeroen Homan, Craig O. Heinke, David A. Pooley, Rudy Wijnands, Arash Bahramian, James C. A. Miller-Jones   +6 more
doaj   +1 more source

Oscillating blue stragglers, γDoradus stars and eclipsing binaries in the open cluster NGC 2506 [PDF]

, 2007
T. Arentoft, J. De Ridder, F. Grundahl, L. Glowienka, C. Waelkens, M. A. Dupret, A. Grigahcène, K. Lefever, Hannes Jensen, M. Reyniers, S. Frandsen, H. Kjeldsen   +11 more
openalex   +1 more source

Dynamical Evolution of Four Old Galactic Open Clusters Traced by Their Constituent Stars with Gaia DR3

The Astronomical Journal
We investigate the evolutionary stages of four open clusters—Berkeley 39, Collinder 261, NGC 6819, and NGC 7789—of ages ranging from 1.6 to 6 Gyr. These clusters have previously been classified into dynamically young and intermediate age groups based on ...
Shanmugha Balan, Khushboo K. Rao, Kaushar Vaidya, Manan Agarwal, Souradeep Bhattacharya   +4 more
doaj   +1 more source