Results 41 to 50 of about 438,137 (232)

Globular cluster star classification: Application to M13 [PDF]

Serbian Astronomical Journal, 2013
Starting from recent determination of Fe, O, Na abundances on a restricted sample (N = 67) of halo and thick disk stars, a natural and well motivated selection criterion is defined for the classification globular cluster stars. An application is
Caimmi R.
doaj   +1 more source

Joint Power Allocation Algorithm for UAV-Borne Simultaneous Transmitting and Reflecting Reconfigurable Intelligent Surface-Assisted Non-Orthogonal Multiple Access System

IEEE Access, 2023
As a novel technology, simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) provides users with full spatial coverage communication by modulating reflected and refracted signals.
Yi Peng, Jian Tang, Qingqing Yang, Zhuoting Han, Jian Ma   +4 more
doaj   +1 more source

JWST Observations of Starbursts: Massive Star Clusters in the Central Starburst of M82

The Astrophysical Journal Letters
We present a near-infrared (NIR) candidate star cluster catalog for the central kiloparsec of M82 based on new JWST NIRCam images. We identify star cluster candidates using the F250M filter, finding 1357 star cluster candidates with stellar masses >10 ^4
Rebecca C. Levy, Alberto D. Bolatto, Divakara Mayya, Bolivia Cuevas-Otahola, Elizabeth Tarantino, Martha L. Boyer, Leindert A. Boogaard, Torsten Böker, Serena A. Cronin, Daniel A. Dale, Keaton Donaghue, Kimberly L. Emig, Deanne B. Fisher, Simon C. O. Glover, Rodrigo Herrera-Camus, María J. Jiménez-Donaire, Ralf S. Klessen, Laura Lenkić, Adam K. Leroy, Ilse De Looze, David S. Meier, Elisabeth A. C. Mills, Juergen Ott, Mónica Relaño, Sylvain Veilleux, Vicente Villanueva, Fabian Walter, Paul P. van der Werf   +27 more
doaj   +1 more source

The Chinese ground-based instrumentation in support of the combined Cluster/Double Star satellite measurements [PDF]

Annales Geophysicae, 2005
Ground-based observations can be used to provide substantial support for Cluster/Double Star measurements and greatly enhance the mission's scientific return. There are six Chinese ground stations involved in coordinated cluster/Double Star and ground-
R.-Y. Liu, Y.-H. Liu, Z.-H. Xu, H.-Q. Hu, H.-G. Yang, B.-C. Zhang, W.-Y. Xu, G.-X. Chen, J. Wu, W.-M. Zhen, D.-H. Huang, Z.-J. Hu, Z.-X. Deng   +12 more
doaj   +1 more source

Comparing the relation between star formation and galaxy mass in different environments [PDF]

, 2009
Analyzing 24 mu m MIPS/Spitzer data and the [O II]3727 line of a sample of galaxies at 0.4 < z < 0.8 from the ESO Distant Cluster Survey (EDisCS), we investigate the ongoing star formation rate (SFR) and the specific star formation rate (SSFR) as a ...
Bai, Bai, Bai, Balogh, Bell, Cassata, Daddi, Dale, Desai, Feulner, Finn, Kewley, Noeske, Noeske, Pannella, Pelló, Poggianti, Poggianti, Pérez-González, Rines, Sudžius, Willmer, Yan, Zheng   +23 more
core   +2 more sources

A Long-Period Totally Eclipsing Binary Star at the Turnoff of the Open Cluster NGC 6819 Discovered with Kepler

, 2012
We present the discovery of the totally eclipsing long-period (P = 771.8 d) binary system WOCS 23009 in the old open cluster NGC 6819 that contains both an evolved star near central hydrogen exhaustion and a low-mass (0.45 Msun) star.
Brewer, Lauren N., Brogaard, Karsten, Bruntt, Hans, Frandsen, Soeren, Geller, Aaron M., Grundahl, Frank, Jeffries Jr, Mark W., Mathieu, Robert D., Meibom, Soren, Milliman, Katelyn E., Orosz, Jerome A., Platais, Imants, Sandquist, Eric L., Stello, Dennis   +13 more
core   +1 more source

The most massive progenitors of neutron stars: CXO J164710.2-455216

, 2008
The evolution leading to the formation of a neutron star in the very young Westerlund 1 star cluster is investigated. The turnoff mass has been estimated to be 35 Msun, indicating a cluster age ~ 3-5 Myr.
Ergma E., Hamann W.-R., Kaper L., Krzysztof Belczynski, Kudritzki R., Maeder A., Muno M. P., Nieuwenhuijzen H., Nugis T., Portegies Zwart S. F., Ronald E. Taam, Tout C., Wellstein S.   +12 more
core   +1 more source

The Trouble with Hubble Types in the Virgo Cluster [PDF]

, 1998
Quantitative measures of central light concentration and star formation activity are derived from R and Halpha surface photometry of 84 bright S0-Scd Virgo Cluster and isolated spiral galaxies.
de Jong R., Gourgoulhon E., Jeffrey D. P. Kenney, Rebecca A. Koopmann   +3 more
core   +2 more sources

Star clusters in the Matching, Morse, and Generalized complex of discrete Morse functions [PDF]

, 2023
Connor Donovan, Nicholas A. Scoville
openalex   +1 more source

Star Clusters

, 2006
Star clusters are observed in almost every galaxy. In this thesis we address several fundamental problems concerning the formation, evolution and disruption of star clusters. From observations of (young) star clusters in the interacting galaxy M51, we found that clusters are formed in complexes of stars and star clusters.
openaire   +6 more sources