Results 51 to 60 of about 959 (179)

Solar disk integration polarimeter: An automated disk‐integration full‐Stokes‐vector solar feed for the Potsdam Echelle Polarimetric and Spectroscopic Instrument spectrograph

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We introduce a new solar feed for the PEPSI nighttime spectrograph of the LBT. It enables spectroscopy of the Sun‐as‐a‐star in circular polarization (CP) and linear polarization (LP) with a spectral resolution of 250,000 (≈0.025Å or 600ms−1$$ 600\kern0.1em \mathrm{m}\kern0.1em {\mathrm{s}}^{-1} $$) for the wavelength range 383–907 nm.
Klaus G. Strassmeier, Ilya Ilyin, Manfred Woche, Frank Dionies, Michael Weber, Arto Järvinen, Carsten Denker, Ekaterina Dineva, Meetu Verma, Thomas Granzer, Wilbert Bittner, Svend‐Marian Bauer, Jens Paschke, Hakan Önel   +13 more
wiley   +1 more source

Atomic Scale Structure of Self‐Assembled Lipidated Peptide Nanomaterials

Advanced Materials, Volume 36, Issue 24, June 13, 2024.
A bottom‐up theoretical approach is reported to produce the first atomically resolved experimentally consistent model of lipidated β‐peptide nanomaterials. The β‐peptide materials possess long‐term mechanical and chemical stability in vivo, and may be easily decorated with combinations of different biological cues. This unique combination of properties
Billy J. Williams‐Noonan, Ketav Kulkarni, Nevena Todorova, Matteo Franceschi, Christopher Wilde, Mark P. Del Borgo, Louise C. Serpell, Marie‐Isabel Aguilar, Irene Yarovsky   +8 more
wiley   +1 more source

SCExAO/CHARIS Near-infrared Scattered-light Imaging and Integral Field Spectropolarimetry of the AB Aurigae Protoplanetary System

The Astrophysical Journal
We analyze near-infrared integral field spectropolarimetry of the AB Aurigae protoplanetary disk and protoplanet (AB Aur b), obtained with SCExAO/CHARIS in 22 wavelength channels covering the J , H , and K passbands ( λ _0 = 1.1–2.4 μ m) over angular ...
Erica Dykes, Thayne Currie, Kellen Lawson, Miles Lucas, Tomoyuki Kudo, Minghan Chen, Olivier Guyon, Tyler D. Groff, Julien Lozi, Jeffrey Chilcote, Timothy D. Brandt, Sebastien Vievard, Nour Skaf, Vincent Deo, Mona El Morsy, Danielle Bovie, Taichi Uyama, Carol Grady, Michael Sitko, Jun Hashimoto, Frantz Martinache, Nemanja Jovanovic, Motohide Tamura, N. Jeremy Kasdin   +23 more
doaj   +1 more source

Spiropyran‐Based Photoisomerizable α‐Amino Acid for Membrane‐Active Peptide Modification

Chemistry – A European Journal, Volume 30, Issue 22, April 16, 2024.
A spiropyran‐derived α‐amino acid was carefully designed for the synthesis of photocontrollable bioactive peptides. Dramatic changes in structure and polarity occurring upon light exposure or dark adaptation of the spiropyran side chain can cause changes in the behavior of peptides in lipid membranes and living cells, as demonstrated on spiropyran ...
Andrii Hrebonkin, Sergii Afonin, Anna Nikitjuka, Oleksandr V. Borysov, Gundars Leitis, Oleg Babii, Serhii Koniev, Theo Lorig, Stephan L. Grage, Peter Nick, Anne S. Ulrich, Aigars Jirgensons, Igor V. Komarov   +12 more
wiley   +1 more source

The CHARA Array Polarization Model and Prospects for Spectropolarimetry

The Astronomical Journal
Polarimetric data provide key insights into infrared emission mechanisms in the inner disks of young stellar objects (YSOs) and the details of dust formation around asymptotic giant branch (AGB) stars. While polarization measurements are well-established
Linling Shuai, John D. Monnier, Benjamin R. Setterholm, Stefan Kraus, Narsireddy Anugu, Tyler Gardner, Jean-Baptiste Le Bouquin, Gail H. Schaefer   +7 more
doaj   +1 more source

Derivation and Application of a Scaling between Hinode/SP and SDO/HMI Vector Magnetic Fields to Improve Magnetic Field Extrapolations

The Astrophysical Journal
Full-disk measurements of the solar magnetic field by the Helioseismic and Magnetic Imager (HMI) are often used for magnetic field extrapolations, but its limited spatial and spectral resolution can lead to significant errors.
C. Beck, A. Prasad, Q. Hu, M. S. Yalim, S. Gosain, D. Prasad Choudhary   +5 more
doaj   +1 more source

Spectropolarimetry and the Study of Circumstellar Disks [PDF]

, 2007
Circumstellar disks play an important role in many stages of the evolution of stars. However, it is only possible to directly image circumstellar disks for a few of the nearest stars. For massive stars, the situation is even more difficult, as they are on average further away than the more numerous low mass stars.
openaire   +2 more sources

Photospheric Pore Rotation Associated with a C-class Flare from Spectropolarimetric Observations with DKIST

The Astrophysical Journal Letters
We present high-resolution observations of a C4.1-class solar flare (SOL2023-05-03T20:53) in AR 13293 from the Visible Spectro-Polarimeter (ViSP) and Visible Broadband Imager (VBI) instruments at the DKIST.
Rahul Yadav, Maria D. Kazachenko, Andrey N. Afanasyev, Gianna Cauzzi, Kevin Reardon   +4 more
doaj   +1 more source

Spectropolarimetry of Fraunhofer Lines in Local Upper Solar Atmosphere

The Astrophysical Journal
Spectropolarimetric results of Fraunhofer lines between 516.3 and 532.6 nm are presented in local upper solar chromosphere and inner corona below a height of about 0.04 solar radius above the solar limb. The data were acquired on 2013 November 3 during a
Z. Q. Qu, L. Chang, G. T. Dun, X. M. Cheng, C. Fang, Z. Xu, D. Yuan, L. H. Deng, X. Y. Zhang   +8 more
doaj   +1 more source

Infrared spectropolarimetry of a C-class solar flare footpoint plasma

Astronomy & Astrophysics
We performed high-spatial-resolution spectropolarimetric observations of the active region NOAA 13363 during a C-class flare with the Gregor Infrared Spectrograph (GRIS) on 16 July 2023.
Vashalomidze Z., Noda C. Quintero, Zaqarashvili T. V., Benko M., Kuridze D., Gömöry P., Rybák J., Lomineishvili S., Collados M., Denker C., Verma M., Kuckein C., Ramos A. Asensio   +12 more
doaj   +1 more source