Results 11 to 20 of about 6,137,241 (375)

Statistics Of Multiple Stars [PDF]

International Astronomical Union Colloquium, 2004
AbstractThe statistics of stellar systems of multiplicity three and higher is reviewed. They are frequent, 0.15−0.25 of all stellar systems. Some 700 multiples are expected among the 3383 stars of spectral type F, G, and K within 50 pc, while only 76 of them are actually known.
Andreï Tokovinin
openalex   +3 more sources

The GALAH survey: multiple stars and our Galaxy [PDF]

Astronomy & Astrophysics, 2020
Context. Binary stellar systems form a large fraction of the Galaxy’s stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken into account when observations of stars are used to ...
G. Traven, S. Feltzing, T. Merle, M. V. D. Swaelmen, K. vCotar, R. Church, T. Zwitter, Y. Ting, C. Sahlholdt, M. Asplund, J. Bland-Hawthorn, G. D. Silva, K. Freeman, S. Martell, S. Sharma, D. Zucker, S. Buder, A. Casey, V. D’Orazi, J. Kos, G. Lewis, J. Lin, K. Lind, J. Simpson, D. Stello, U. Munari, R. Wittenmyer   +26 more
semanticscholar   +1 more source

Follow-Up and Validation of K2 and TESS Planetary Systems With Keck NIRC2 Adaptive Optics Imaging

Frontiers in Astronomy and Space Sciences, 2021
High resolution imaging (HRI) is a critical part of the transiting exoplanet follow-up and validation process. HRI allows previously unresolved stellar companions and background blends to be resolved, vetting false positive signals and improving the ...
Joshua E. Schlieder, Erica J. Gonzales, David R. Ciardi, Rahul I. Patel, Ian J. M. Crossfield, Justin R. Crepp, Courtney D. Dressing, Thomas Barclay, Thomas Barclay, Andrew W. Howard   +9 more
doaj   +1 more source

Architecture of Hierarchical Stellar Systems and Their Formation

Universe, 2021
Accumulation of new data on stellar hierarchical systems and the progress in numerical simulations of their formation open the door to genetic classification of these systems, where properties of a certain group (family) of objects are tentatively ...
Andrei Tokovinin
doaj   +1 more source

Twin High-Resolution, High-Speed Imagers for the Gemini Telescopes: Instrument Description and Science Verification Results

Frontiers in Astronomy and Space Sciences, 2021
Two new imaging instruments, ‘Alopeke and Zorro, were designed, built, and commissioned at the Gemini-North and Gemini-South telescopes in 2018 and 2019, respectively. Here we describe them and present the results from over a year of operation.
Nicholas J. Scott, Steve B. Howell, Crystal L. Gnilka, Andrew W. Stephens, Ricardo Salinas, Rachel A. Matson, Elise Furlan, Elliott P. Horch, Mark E. Everett, David R. Ciardi, Dave Mills, Emmett A. Quigley   +11 more
doaj   +1 more source

Atmospheric and Fundamental Parameters of Eight Nearby Multiple Stars

, 2022
We present the complete set of atmospheric and fundamental parameters, in addition to the masses, for the individual components of eight stellar systems.
A. M. Hussein, M. Al-Wardat, A. Abushattal, H. Widyan, Enas M. Abu-Alrob, O. Malkov, M. Barstow   +6 more
semanticscholar   +1 more source

Multiplicity of Massive Stars [PDF]

Symposium - International Astronomical Union, 2001
We discuss the observed multiplicity of massive stars and implications on theories of massive star formation. After a short summary of the literature on massive star multiplicity, we focus on the O-and B-type stars in the Orion Nebula Cluster, which constitute a homogenous sample of very young massive stars.
Hans Zinnecker, Thomas Preibisch, G. Weigelt   +2 more
openaire   +3 more sources

The multiplicity of massive stars [PDF]

Proceedings of the International Astronomical Union, 2010
AbstractBinaries are excellent astrophysical laboratories that provide us with direct measurements of fundamental stellar parameters. Compared to single isolated stars, multiplicity induces new processes, offering the opportunity to confront our understanding of a broad range of physics under the extreme conditions found in, and close to, astrophysical
Sana, H.A.A., Evans, C.
openaire   +3 more sources

Multiple Populations in Star Clusters

Universe, 2022
We review the multiple population (MP) phenomenon of globular clusters (GCs): i.e., the evidence that GCs typically host groups of stars with different elemental abundances and/or distinct sequences in photometric diagrams. Most Galactic and extragalactic clusters exhibit internal variations of He, C, N, O, Na, and Al.
Milone, Antonino P, Marino, AF
openaire   +4 more sources

Dynamics of Four Triple Systems

The Astronomical Journal, 2023
Orbital motions in four hierarchical stellar systems discovered by speckle interferometry are studied. Their inner orbits are relatively well constrained, while the long outer orbits are less certain.
Andrei Tokovinin
doaj   +1 more source