Results 111 to 120 of about 303,706 (359)

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

Precise Age for the Binary Star System 12 Com in the Coma Berenices Cluster

The Astronomical Journal, 2023
We present measurements of the interferometrically resolved binary star system 12 Com and the single giant star 31 Com in the cluster Coma Berenices. 12 Com is a double-lined spectroscopic binary system consisting of a G7 giant and an A3 dwarf at the ...
Rex Lam, Eric L. Sandquist, Gail H. Schaefer, Christopher D. Farrington, John D. Monnier, Narsireddy Anugu, Cyprien Lanthermann, Robert Klement, Jacob Ennis, Benjamin R. Setterholm, Tyler Gardner, Stefan Kraus, Claire L. Davies, Jerome A. Orosz   +13 more
doaj   +1 more source

Spectroscopic Studies of Binary and Multiple Star Systems [PDF]

International Astronomical Union Colloquium, 1992
There can be few subjects that benefit more than binary stars do from complementary approaches. Consider their orbits, for an initial example. By ‘visual’ methods — by which I mean all methods of obtaining angular resolution on the sky, including the modern techniques of optical interferometry — one can determine an orbit, but with the scale known in ...
openaire   +1 more source

Removing Homocoupling Defects in Alkoxy/Alkyl‐PBTTT Enhances Polymer:Fullerene Co‐Crystal Formation and Stability

Advanced Functional Materials, EarlyView.
PBTTT‐OR‐R, a C14‐alkoxy/alkyl‐PBTTT polymer derivative, is of substantial interest for optoelectronics due to its specific fullerene intercalation behavior and enhanced charge‐transfer absorption. Comparing this polymer with (S) and without (O) homocoupling defects reveals that PBTTT‐OR‐R(O) forms stable co‐crystals with PC61BM, while PBTTT‐OR‐R(S ...
Zhen Liu, Jochen Vanderspikken, Paola Mantegazza, Stefania Moro, Mouna Hamid, Sigurd Mertens, Niko Van den Brande, Laurence Lutsen, Vincent Lemaur, David Beljonne, Giovanni Costantini, Koen Vandewal, Bruno Van Mele, Wouter Maes, Bart Goderis   +14 more
wiley   +1 more source

Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752

The Astronomical Journal, 2022
We present analyses of improved photometric and spectroscopic observations for two detached eclipsing binaries at the turnoff of the open cluster NGC 752: the 1.01 days binary DS And and the 15.53 days BD +37 410. For DS And, we find M _1 = 1.692 ± 0.004
Eric L. Sandquist, Andrew J. Buckner, Matthew D. Shetrone, Samuel C. Barden, Catherine A. Pilachowski, Constantine P. Deliyannis, Dianne Harmer, Robert Mathieu, Søren Meibom, Søren Frandsen, Jerome A. Orosz   +10 more
doaj   +1 more source

A highly eccentric spectroscopic binary star: HD 5624

, 2019
This work was supported by The Scientific and Technological Research Council of Turkey (TUBITAK), the project number 114F099. The authors would like to thank both TUBITAK National Observatory (TUG) and KFU for supports in using RTT150.
Yilmaz M., Selam S., Izumiura H., Bikmaev I., Sato B., Keskin V., Kambe E.   +6 more
openaire   +5 more sources

Bayesian analysis of exoplanet and binary orbits

, 2012
We introduce BASE (Bayesian astrometric and spectroscopic exoplanet detection and characterisation tool), a novel program for the combined or separate Bayesian analysis of astrometric and radial-velocity measurements of potential exoplanet hosts and ...
Armstrong, Armstrong, Bayes, Bond, Brooks, Charbonneau, Delplancke, Ford, Gatewood, Gelman, Gregory, Hastings, Holman, Hummel, Hummel, Koch, Kuhn, Lange, Lindegren, Lyot, Mahalanobis, Mamajek, Mao, Marois, Mayor, McArthur, Metropolis, Nascimbeni, Perryman, Perryman, Pickering, Prevot, R. Launhardt, Reffert, Seager, Shao, Smith, Smith, Sozzetti, T. Henning, T. Schulze-Hartung, Thiele, Tolbert, Vigan, Vogt, Wolszczan   +45 more
core   +1 more source

Designing Metastable P3‐type Layered Negative Electrodes with High Na Vacancy Concentration for High‐Power Sodium‐Ion Batteries

Advanced Functional Materials, EarlyView.
A metastable high‐vacancy concentration layered P3‐type Na0.5Cr0.5Ti0.5O2 negative electrode material has been synthesized from its K analogues P3‐type K0.5Cr0.5Ti0.5O2 using a facile room temperature ion‐exchange method. The P3‐type Na0.5Cr0.5Ti0.5O2 demonstrates a gravimetric capacity of 125 mA h g−1 and high‐rate performance (80% charging in 3 min ...
Alok K. Pandey, Benoît D.L. Campéon, Saad Zafar, Toru Ishigaki, Tsubasa Koyama, Masanobu Nakayama, Naoaki Yabuuchi   +6 more
wiley   +1 more source

Dynamical Asteroseismology: towards improving the theories of stellar structure and (tidal) evolution

EPJ Web of Conferences, 2017
The potential of the dynamical asteroseismology, the research area that builds upon the synergies between the asteroseismology and binary stars research fields, is discussed in this manuscript.
Tkachenko Andrew
doaj   +1 more source

A catalogue of spectroscopic binary candidate stars derived from a comparison of Gaia DR2 with other radial velocity catalogues [PDF]

, 2019
Using the recently published Gaia second data release which includes measurements of the mean radial velocity of about 7.2 million stars, we performed a systematic comparison with other existing radial velocity catalogues in order to search for variations in the radial velocity measurements, with the goal that detected differences may indicate that ...
arxiv   +1 more source