Results 71 to 80 of about 4,407 (194)

A chemical study of M67 candidate blue stragglers and evolved blue stragglers observed with APOGEE DR14 [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
Within the variety of objects populating stellar clusters, blue straggler stars (BSSs) are among the most puzzling ones. BSSs are commonly found in globular clusters, but they are also known to populate open clusters of the Milky Way. Two main theoretical scenarios (collisions and mass transfer) have been suggested to explain their formation, although ...
Bertelli Motta, Clio, Pasquali, Anna, Caffau, Elisabetta, Grebel, Eva K., Bertelli motta, Clio, Grebel, Eva   +5 more
openaire   +3 more sources

Photometry of the Globular Cluster NGC 5466: Red Giants and Blue Stragglers

, 2007
We present wide-field BVI photometry for about 11,500 stars in the low-metallicity cluster NGC 5466. We have detected the red giant branch bump for the first time, although it is at least 0.2 mag fainter than expected relative to the turnoff.
Eggleton P. P., Eric L. Sandquist, Ferraro F. R., Fusi Pecci F., Michael Bolte, Nassissie Fekadu, Piotto G., Zaggia S. R., Zoccali M.   +8 more
core   +1 more source

A Search for Magnetically Active Binary Counterparts to Chandra X-Ray Sources in 47 Tucanae with HST Imaging

The Astrophysical Journal
Using Hubble Space Telescope (HST) imaging, we searched for candidate magnetically active binary (AB) counterparts to low-luminosity Chandra X-ray sources in the globular cluster 47 Tucanae (NGC 104). We consider the catalog of 300 Chandra sources within
Haldan N. Cohn, Phyllis M. Lugger, Craig O. Heinke, Maureen van den Berg, Liliana Rivera Sandoval, Jay Anderson   +5 more
doaj   +1 more source

Spectroscopy of Blue Stragglers and Turnoff Stars in M67 (NGC 2682)

, 2000
We have analyzed high-resolution spectra of relatively cool blue stragglers and main sequence turnoff stars in the old open cluster M67 (NGC 2682).
Ahumada J., Andrievsky S. M., Anupama G. C., Belloni T., Chevalier C., Edvardsson B., Eric L. Sandquist, Faraggiana R., Goranskij V. P., Gratton R. G., Harlow J. J. B., Mathys G., Matthew D. Shetrone, Murray C. A., Murray C. A., Perryman M. A. C., Sanders W. L., Sanders W. L., Sarna M. J., Talon S., van den Berg M., Varenne O., Zhao J. L.   +22 more
core   +1 more source

A halo blue straggler on a highly eccentric retrograde orbit [PDF]

, 2010
Blue straggler, which are stars that appear to be younger than they should be, are an important population of unusual stars in both stellar clusters and the halo field of the Galaxy.
A. Tillich, Abadi, Allen, Brown, Carney, Carney, De Marco, Dehnen, Ferraro, Hambly, Hills, Jordi, Lawrence, Mathieu, N. Przybilla, Nieva, Odenkirchen, Pauli, Preston, Przybilla, Przybilla, Przybilla, Przybilla, Przybilla, Przybilla, Przybilla, Przybilla, R.-D. Scholz, Ramspeck, Sandage, Schaller, Tillich, U. Heber, Xue   +33 more
core   +1 more source

The blue stragglers of Omega Centauri

The Astrophysical Journal, 1986
On a obtenu les spectres 3500-5000 A (resolution 3,6 A) de six candidats. Ils ne presentent aucune caracteristique inhabituelle. les vitesses radiales montrent que ces six vagabondes bleues appartiennent a l'amas.
G. S. Da Costa, J. Norris, J. V. Villumsen   +2 more
openaire   +1 more source

WIYN Open Cluster Study. XCVII. An Extended Radial-velocity Survey and Spectroscopic Binary Orbits in the Open Cluster NGC 188

The Astronomical Journal
We present 35 new spectroscopic-binary orbits from our extended radial-velocity (RV) survey of the old (6.4 ± 0.2 Gyr) open cluster NGC 188. Using data from the WIYN Open Cluster Study (WOCS) and APOGEE-2, this work nearly doubles the temporal baseline ...
Ritvik Sai Narayan, Evan Linck, Robert D. Mathieu, Aaron M. Geller   +3 more
doaj   +1 more source

Field Blue Stragglers and Related Mass Transfer Issues

, 2014
This chapter contains my impressions and perspectives about the current state of knowledge about field blue stragglers (FBS) stars, drawn from an extensive literature that I searched. I conclude my review of issues that attend FBS and mass transfer, by a
A. Buzzoni, A. D. Vanture, A. Duquennoy, A. F. Marino, A. F. Marino, A. G. D. Philip, A. J. Horton, A. Jorissen, A. M. Boesgaard, A. M. Boesgaard, A. Manduca, A. R. Sandage, A. R. Sandage, A. Tokovinin, A. W. Rodgers, A. W. Rodgers, B. Paczynski, B. Tian, B. W. Bopp, B. W. Carney, B. W. Carney, B. Yanny, C. Flynn, C. J. Pritchet, C. L. Perry, C. M. Lance, C. M. Lance, D. A. VandenBergh, D. A. VandenBergh, D. Geisler, D. H. McNamara, D. W. Latham, E. Böhm-Vitense, E. Carretta, E. H. Olsen, E. H. Olsen, E. M. Green, E. Poretti, E. Sirko, F. Marchi De, F. Spite, G Michaud, G. Beccari, G. I. Mandushev, G. P. Kuiper, G. Pietrzyński, G. Piotto, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. W. Preston, G. Wallerstein, H Bondi, H. J. Newberg, H. M. J. Boffin, H. M. J. Boffin, H. Morrison, I Soszyński, I. B. Thompson, I. I. Ivans, I. King, J. A. Thorburn, J. A. Thorburn, J. E. Hesser, J. E. Norris, J. F. Sepinsky, J. F. Sepinsky, J. F. Sepinsky, J. L. Sérsic, J. Norris, J. O. Petersen, J. R. Pier, J. W. Glaspey, K. A. Venn, K. Fuhrmann, K. Fuhrmann, K. Innanen, L. A. Balona, L. Clewley, L. M. Hobbs, L. Searle, M Shetrone, M. Bolte, M. D. Shetrone, M. H. Pinsonneault, M. H. Pinsonneault, M. H. Pinsonneault, M. Livio, M. Livio, M. Mateo, M. Monelli, M. Spite, M. Zoccali, N. Sanduleak, N. Soker, O. J. Eggen, O. Struve, O. Y. Gnedin, P. B. Stetson, P. Côté, P. J. T. Leonard, P. P. Eggleton, R Kippenhahn, R. Buser, R. D. McClure, R. D. McClure, R. E. Cohen, R. E. Davies, R. J. Stancliffe, R. J. Stancliffe, R. W. Hilditch, R. Wilhelm, R. Wilhelm, S. Bisterzo, S. E. Koposov, S. G. Ryan, S. G. Ryan, S. Vauclair, S. Yi, T. A. Smecker-Hane, T. C. Beers, T. C. Beers, T. D. Kinman, T. Masseron, T. Theuns, W. H. McCrea, W. I. Clarkson, W. L. Melbourne, W. R. Brown, X.-X. Xue, Y.-W. Lee, Z. Han   +134 more
core   +1 more source

Beryllium in the Ultra-Lithium-Deficient,Metal-Poor Halo Dwarf, G186-26

, 2005
The vast majority of low-metal halo dwarfs show a similar amount of Li; this has been attributed to the Li that was produced in the Big Bang. However, there are nine known halo stars with T $>$ 5900 K and [Fe/H] $
Alonso A., Ann Merchant Boesgaard, Bonifacio P., Magain P., Megan C. Novicki, Noguchi K., Primas F., Primas F., Schuster W. J., Spite F., Spite M., Spite M.   +11 more
core   +2 more sources

Deep multi-telescope photometry of NGC 5466. I. Blue Stragglers and binary systems

, 2013
We present a detailed investigation of the radial distribution of blue straggler star and binary populations in the Galactic globular cluster NGC 5466, over the entire extension of the system.
Beccari, G., Bellazzini, M., Dalessandro, E., Ferraro, F. R., Lanzoni, B., Miocchi, P., Sollima, A.   +6 more
core   +1 more source