Results 71 to 80 of about 31,802 (281)

Solid Harmonic Wavelet Bispectrum for Image Analysis

Advanced Science, EarlyView.
The Solid Harmonic Wavelet Bispectrum (SHWB), a rotation‐ and translation‐invariant descriptor that captures higher‐order (phase) correlations in signals, is introduced. Combining wavelet scattering, bispectral analysis, and group theory, SHWB achieves interpretable, data‐efficient representations and demonstrates competitive performance across texture,
Alex Brown, Mathilda Avirett‐Mackenzie, Carolin Villforth, Georgios Exarchakis   +3 more
wiley   +1 more source

The fast rotating, low gravity subdwarf B star EC 22081-1916 - Remnant of a common envelope merger event

, 2011
Hot subdwarf B stars (sdBs) are evolved core helium-burning stars with very thin hydrogen envelopes. In order to form an sdB, the progenitor has to lose almost all of its hydrogen envelope right at the tip of the red giant branch. In binary systems, mass
Copperwheat, For, Geier, Geier, Geier, Geier, Heber, Heber, Napiwotzki, Nelemans, Pojmanski, Politano, Roeser, Skrutskie, Soker, Soker, Stark, Stobie, Woźniak, Zacharias, Østensen   +20 more
core   +1 more source

Tomographic Separation of Composite Spectra. IX. The Massive Close Binary HD 115071 [PDF]

, 2002
We present the first orbital elements for the massive close binary, HD 115071, a double-lined spectroscopic binary in a circular orbit with a period of 2.73135 +/- 0.00003 days.
C. Lloyd, Claret A., Cruz-Gonzalez C., D. J. Stickland, de Loore C., Douglas R. Gies, Harries T. J., Hilditch R. W., Howarth I. D., John H. Wise, Laura R. Penny, Lorenz R., Meurs E. J. A., Meynet G., Mochnacki S. W., Schaller G., Stickland D. J., Wade R. A.   +17 more
core   +2 more sources

Photon‐Sphere Modes in Curved Optical Microcavities: A Black‐Hole Analogue Laser

Advanced Science, EarlyView.
An optical analogue of a Schwarzschild black hole is realized using curved microcavities that preserve light‐like geodesics. A new family of laser modes confined around the photon sphere is identified alongside conventional whispering‐gallery modes. Analytical theory, numerical simulations, and experiments reveal curvature‐induced confinement, enabling
Chenni Xu, Aswathy Sundaresan, Nazire‐Begüm Kazkal, Clement Lafargue, Lior Zarfaty, Li‐Gang Wang, Ofek Birnholtz, Dominique Decanini, Melanie Lebental, Patrick Sebbah   +9 more
wiley   +1 more source

Constraining Roche-Lobe Overflow Models Using the Hot-Subdwarf Wide Binary Population

Open Astronomy, 2017
One of the important issues regarding the final evolution of stars is the impact of binarity. A rich zoo of peculiar, evolved objects are born from the interaction between the loosely bound envelope of a giant, and the gravitational pull of a companion ...
Vos Joris, Vučković Maja
doaj   +1 more source

AA Dor - An Eclipsing sdOB - Brown Dwarf Binary [PDF]

, 2003
AA Dor is an eclipsing, close, post common-envelope binary consisting of a sdOB primary star and an unseen secondary with an extraordinary small mass - formally a brown dwarf. The brown dwarf may have been a former planet which survived a common envelope
Rauch, Thomas
core   +5 more sources

Wide post-common envelope binaries containing ultramassive white dwarfs: evidence for efficient envelope ejection in massive AGB stars

, 2023
Post-common-envelope binaries (PCEBs) containing a white dwarf (WD) and a main-sequence (MS) star can constrain the physics of common envelope evolution and calibrate binary evolution models. Most PCEBs studied to date have short orbital periods ($P_{\rm orb} \lesssim 1\,$d), implying relatively inefficient harnessing of binaries' orbital energy for ...
Yamaguchi, Natsuko, El-Badry, Kareem, Fuller, Jim, Latham, David W., Cargile, Phillip A., Mazeh, Tsevi, Shahaf, Sahar, Bieryla, Allyson, Buchhave, Lars A., Hobson, Melissa   +9 more
openaire   +2 more sources

Beyond Transconductance: Cell‐Polymer Coupling Determines Fidelity in Action Potential Recording via Electrolyte‐Gated Polymer Transistors

Advanced Science, EarlyView.
High electrical performance alone does not guarantee efficient bioelectronic signal transduction. Despite excellent mixed ionic‐electronic conduction, recordings from cardiomyocytes reveal that p(g2T‐TT)‐based OECTs predominantly transduce field potential FP‐like signals due to weak cell‐polymer coupling.
Giulia Zoe Zemignani, Elena Mancinelli, Gabriele Tullii, Aleksandr Khudiakov, Cristiano Bortolotti, Shubham Tanwar, Peter J. Schwartz, Luca Sala, Maria Rosa Antognazza, Mario Caironi, Adrica Kyndiah   +10 more
wiley   +1 more source

Long-term Evolution of Massive-star Post-common-envelope Circumbinary Disks and the Environments of Fast Luminous Transients

The Astrophysical Journal, 2023
If the envelope of a massive star is not entirely removed during common envelope (CE) interaction with an orbiting compact (e.g., black hole (BH) or neutron star (NS)) companion, the residual bound material eventually cools, forming a centrifugally ...
Semih Tuna, Brian D. Metzger
doaj   +1 more source

Stellar adiabatic mass loss model and applications

, 2010
Roche-lobe overflow and common envelope evolution are very important in binary evolution, which is believed to be the main evolutionary channel to hot subdwarf stars. The details of these processes are difficult to model, but adiabatic expansion provides
B. Paxton, Hongwei Ge, M.S. Hjellming, M.S. Hjellming, O.R. Pols, O.R. Pols, P.F.L. Maxted, P.P. Eggleton, P.P. Eggleton, P.P. Eggleton, R.A. Saffer, R.F. Webbink, Ronald F. Webbink, S. Rappaport, X. Chen, Xuefei Chen, Z. Han, Z. Han, Z. Han, Z. Han, Zhanwen Han   +20 more
core   +1 more source