Results 61 to 70 of about 562,012 (337)

The Inner Halo of M87: A First Direct View of the Red-Giant Population [PDF]

, 2010
An unusually deep (V,I) imaging dataset for the Virgo supergiant M87 with the Hubble Space Telescope ACS successfully resolves its brightest red-giant stars, reaching M_I(lim) = -2.5.
Blakeslee, Blakeslee, C. Flynn, Caldwell, Ciardullo, Freedman, Gregg, Harris, Harris, Harris, Harris, Harris, Harris, Harris, J. P. Blakeslee, Jordán, Kormendy, Madrid, McConnachie, McConnachie, Mei, Mouhcine, Mouhcine, Mouhcine, Peng, Pritchet, Rejkuba, Rejkuba, Renzini, Rizzi, S. Bird, Sirianni, Stetson, Thomas, Tonry, VandenBerg, W. E. Harris, Waters, Williams, Zeilinger   +39 more
core   +1 more source

Exploring Dipolar Dynamics and Ionic Transport in Metal‐Organic Frameworks: Experimental and Theoretical Insights

Advanced Functional Materials, EarlyView.
In this study, the interplay of dipolar dynamics and ionic charge transport in MOF compounds is investigated. Synthesizing the novel structure CFA‐25 with integrated freely rotating dipolar groups, local and macroscopic effects, including interactions with Cs cations are explored.
Ralph Freund, Arthur Schulz, Peter Lunkenheimer, Maryana Kraft, Thomas Bergler, Harald Oberhofer, Dirk Volkmer   +6 more
wiley   +1 more source

Pentagonal 2D Altermagnets: Material Screening and Altermagnetic Tunneling Junction Device Application

Advanced Functional Materials, EarlyView.
From a database of 170 pentagonal 2D materials, 4 candidates exhibiting altermagnetic ordering are screened. Furthermore, the spin‐splitting and unconventional boundary states in the pentagonal 2D altermagnetic monolayer MnS2 are investigated. A MnS2‐based altermagnetic tunneling junction is designed and, through ab initio quantum transport simulations,
Jianhua Wang, Xingyue Yang, Zongmeng Yang, Jing Lu, Pin Ho, Wenhong Wang, Yee Sin Ang, Zhenxiang Cheng, Shibo Fang   +8 more
wiley   +1 more source

Dependence of Multiband Absolute Magnitudes and Color Indexes of the Tip of the Red Giant Branch Stars on Metallicity in Galactic Globular Clusters

The Astrophysical Journal
The tip of the red giant branch (TRGB) stars have attracted intensive attention in recent years because their I -band absolute magnitudes, M _I , are often used for distance calibration in the Hubble constant measurements because of its almost ...
Zhenzhen Shao, Shu Wang, Biwei Jiang, Xiaofeng Wang, Zhishuai Ge, Haichang Zhu   +5 more
doaj   +1 more source

Red giant evolution in modified gravity [PDF]

Journal of Cosmology and Astroparticle Physics, 2019
In this paper, we study the chameleon profile in inhomogeneous density distributions and find that the fifth force in thin shell near the surface is weaker from what expected in homogeneous density distributions. Also, we check the validity of quasi-static approximation for the chameleon scalar field in the astrophysical time scales.
Najafi, Sh., Mirtorabi, M. T., Ansari, Z., Mota, D. F.   +3 more
openaire   +2 more sources

Prospects of Electric Field Control in Perpendicular Magnetic Tunnel Junctions and Emerging 2D Spintronics for Ultralow Energy Memory and Logic Devices

Advanced Functional Materials, EarlyView.
Electric control of magnetic tunnel junctions offers a path to drastically reduce the energy requirements of the device. Electric field control of magnetization can be realized in a multitude of ways. These mechanisms can be integrated into existing spintronic devices to further reduce the operational energy.
Will Echtenkamp, Brahmdutta Dixit, Yifei Yang, Deyuan Lyu, Thomas Peterson, Qi Jia, Yu‐Chia Chen, Jian‐Ping Wang   +7 more
wiley   +1 more source

Thermohaline mixing and the photospheric composition of low-mass giant stars [PDF]

, 2011
We compute full evolutionary sequences of red giant branch stars close to the luminosity bump by including state of the art composition transport prescriptions for the thermohaline mixing regimes. In particular we adopt a self-consistent double-diffusive
Althaus, Cantiello, Charbonnel, Charbonnel, Charbonnel, Charbonnel, Charbonnel, Denissenkov, Denissenkov, Denissenkov, Eggleton, F. C. Wachlin, Geisler, Gilroy, Gilroy, Gratton, Grossman, Grossman, Iben, Kippenhahn, Krishnamurti, L. G. Althaus, Luck, M. M. Miller Bertolami, Merryfield, Recio-Blanco, Shetrone, Smiljanic, Smith, Spite, Stancliffe, Traxler, Ulrich, Weaver   +33 more
core   +4 more sources

Non-adiabatic oscillations of red giants [PDF]

Monthly Notices of the Royal Astronomical Society, 2007
Abstract Using our non-local time-dependent theory of convection, the linear non-adiabatic oscillations of 10 evolutionary model series with masses of 1–3 M⊙ are calculated. The results show that there is a red giant instability strip in the lower temperature side of the Hertzsprung–Russell diagram which goes along the sequences of the ...
Xiong, D. R., Deng, L.
openaire   +2 more sources

Near‐Infrared Emitting Lanthanide Catecholate Giant Single Crystals – Morphology Control and Photon Down‐Conversion

Advanced Functional Materials, EarlyView.
Controlled syntheses of lanthanide coordination polymers based on the dihydroxybenzoquinone (DHBQ) organic linker afforded large single crystals of Ln‐DHBQ CPs (Ln = Yb, Nd). A novel structural variant of Yb‐DHBQ is identified by means of single crystal diffraction analysis.
Marina I. Schönherr, Alexander Biewald, Andre Mähringer, Thaddäus J. Koller, Peter Mayer, Markus Döblinger, Achim Hartschuh, Dana D. Medina   +7 more
wiley   +1 more source

Metallicity of Globular Cluster M13 from VI CCD Photometry [PDF]

Journal of Astronomy and Space Sciences, 2000
From the VI images of M13, obtained by using 2K CCD camera and the BOAO 1.8m telescope, we derive the (V-I)-V CMD of M13. From the shapes of red giant branch, the magnitude of horizontal branch, and the giant branch bump on the constructed CMD, we ...
Young-Jong Sohn
doaj