Results 111 to 120 of about 536,015 (293)

The Masses and Evolutionary State of the Stars in the Dwarf Nova SS Cygni [PDF]

, 2007
The dwarf nova SS Cygni is a close binary star consisting of a K star transferring mass to a white dwarf by way of an accretion disk. We have obtained new spectroscopic observations of SS Cyg with the Hobby-Eberly Telescope (HET).
Bailey J., Baschek B., Bradford B. Behr, Bruch A., Chabrier G., Claret A., Claret A., Echevarria J., Edward L. Robinson, Friend M. T., Giovannelli F., Hessman F. V., Honey W. B., Martin A. Bitner, Martin J. S., Martinez-Pais I. G.   +15 more
core   +2 more sources

Interaction vesicles as emerging mediators of host‐pathogen molecular crosstalk and their implications for infection dynamics

FEBS Letters, EarlyView.
Interaction extracellular vesicles (iEVs) are hybrid vesicles formed through host‐pathogen communication. They facilitate immune evasion, transfer pathogens' molecules, increase host cell uptake, and enhance virulence. This Perspective article illustrates the multifunctional roles of iEVs and highlights their emerging relevance in infection dynamics ...
Bruna Sabatke, Izadora Volpato Rossi, Marcel I. Ramirez   +2 more
wiley   +1 more source

AN EXTREME ANALOGUE OF ϵ AURIGAE: AN M-GIANT ECLIPSED EVERY 69 YEARS BY A LARGE OPAQUE DISK SURROUNDING A SMALL HOT SOURCE [PDF]

, 2016
We present TYC 2505-672-1 as a newly discovered and remarkable eclipsing system comprising an M-type red giant that undergoes a ∼3.45 year long, near-total eclipse (depth of ∼4.5 mag) with a very long period of ∼69.1 years.
Joseph E. Rodriguez, K. Stassun, M. Lund, R. Siverd, J. Pepper, Sumin Tang, S. Kafka, B. Gaudi, K. Conroy, T. Beatty, D. Stevens, B. Shappee, C. Kochanek   +12 more
semanticscholar   +1 more source

STAT3 expression is reduced in cardiac pericytes in HFpEF and its loss reduces cellular adhesion and induces pericyte senescence

FEBS Letters, EarlyView.
Heart failure with preserved ejection fraction (HFpEF) accounts for half of the heart failure cases. It is characterised by microvascular dysfunction, associated with reduced pericyte coverage and diminished STAT3 expression in pericytes. Loss of STAT3 impairs pericyte adhesion, promotes senescence, and activates a pro‐fibrotic gene program.
Leah Rebecca Vanicek, Ariane Fischer, Mariano Ruz Jurado, Anita Tamiato, Tara Procida‐Kowalski, Jochen Wilhelm, Dennis Hecker, Maximilian Merten, Felicitas Escher, Badder Kattih, Valentina Puntmann, David John, Marcel H. Schulz, Eike Nagel, Stefanie Dimmeler, Guillermo Luxán   +15 more
wiley   +1 more source

Evolution of BD-14 3065b (TOI-4987b) from giant planet to brown dwarf as possible evidence of deuterium burning at old stellar ages [PDF]

Astronomy & Astrophysics
The present study confirms BD-14\,3065b as a transiting planet-brown dwarf in a triple-star system, with a mass near the deuterium-burning boundary. BD-14\,3065b has the largest radius observed within the sample of giant planets and brown dwarfs around ...
J. vSubjak, D. Latham, S. Quinn, P. Berlind, Mike Calkins, G. Esquerdo, R. Brahm, E. Guenther, Jan Jan'ik, Petr Kab'ath, L. Vanzi, J. A. Caballero, J. Jenkins, I. Mireles, S. Seager, A. Shporer, S. Striegel, J. Winn   +17 more
semanticscholar   +1 more source

The post-common-envelope, binary central star of the planetary nebula Hen 2-11

, 2014
We present a detailed photometric study of the central star system of the planetary nebula Hen 2-11, selected for study because of its low-ionisation filaments and bipolar morphology - traits which have been strongly linked with central star binarity ...
Boffin, Henri M. J., Corradi, Romano L. M., Jones, David, Miszalski, Brent, Tyndall, Amy A., Wesson, Roger   +5 more
core   +1 more source

Ion channel function of polycystin‐2/polycystin‐1 heteromer revealed by structure‐guided mutagenesis

FEBS Letters, EarlyView.
Mutations in polycystin‐1 (PC1) or polycystin‐2 (PC2) cause autosomal‐dominant polycystic kidney disease (ADPKD). We generated a novel gain‐of‐function PC2/PC1 heteromeric ion channel by mutating pore‐blocking residues. Moreover, we demonstrated that PC2 will preferentially assemble with PC1 to form heteromeric complexes when PC1 is co‐expressed ...
Tobias Staudner, Juthamas Khamseekaew, M. Gregor Madej, Linda Geiges, Bardha Azemi, Christine Ziegler, Christoph Korbmacher, Alexandr V. Ilyaskin   +7 more
wiley   +1 more source

K Dwarf Radius Inflation and a 10 Gyr Spin-down Clock Unveiled through Asteroseismology of HD 219134 from the Keck Planet Finder

The Astrophysical Journal
We present the first asteroseismic analysis of the K3 V planet host HD 219134 based on four consecutive nights of radial velocities collected with the Keck Planet Finder.
Yaguang Li, Daniel Huber, J. M. Joel Ong, Jennifer van Saders, R. R. Costa, Jens Reersted Larsen, Sarbani Basu, Timothy R. Bedding, Fei Dai, Ashley Chontos, Theron W. Carmichael, Daniel Hey, Hans Kjeldsen, Marc Hon, Tiago L. Campante, Mário J. P. F. G. Monteiro, Mia Sloth Lundkvist, Nicholas Saunders, Howard Isaacson, Andrew W. Howard, Steven R. Gibson, Samuel Halverson, Kodi Rider, Arpita Roy, Ashley D. Baker, Jerry Edelstein, Chris Smith, Benjamin J. Fulton, Josh Walawender   +28 more
doaj   +1 more source

VLT optical observations of V821 Ara(=GX339-4) in an extended "off" state [PDF]

, 2001
We report on low-resolution spectroscopy of GX339-4 during its current, extended X-ray `off' state in May 2000 (r=20.1) obtained with the VLT Focal Reducer/low dispersion Spectrograph (FORS1). Although we do not positively detect the secondary star in GX339-4 we place an upper limit of 30 percent on the contribution of a ``normal'' K-type secondary ...
arxiv   +1 more source

SOAR-OSIRIS observations of the Sh 2-307 HII region: Triggered star formation beyond the solar circle

, 2009
This work aims to the study of the Sh 2-307 HII region and related stellar population. Near-infrared imaging and spectroscopic observations in the direction of Sh 2-307 were performed using OSIRIS at SOAR Telescope.
A. Roman-Lopes, Ali, Baraffe, Blum, Casali, Churchwell, Dutra, Elmegreen, Fitzpatrick, Garcia-Segura, Haisch, Han, Hanson, Hanson, Hanson, Hoffmeister, Hunter, Ivanov, Kim, Koornneef, Lada, Lada, Lefloch, Maiz-Apellaniz, Martins, Meyer, Meynet, Moffat, Palla, Roman-Lopes, Roman-Lopes, Russeil, Salpeter, Scalo, Sharpless, Siess, Spitzer, Stetson, Tenorio-Tagle, Urquhart, Walborn, Wegner, Wood   +42 more
core   +1 more source