Results 41 to 50 of about 959 (179)
Spectropolarimetry of magnetic stars [PDF]
Astronomy and Astrophysics Supplement Series, 1997 New determinations of the mean longitudinal magnetic field, of the crossover, and of the mean quadratic magnetic field of Ap stars are presented. They are based on spectra recorded simultaneously in both circular polarizations at ESO with the CASPEC spectrograph fed by the 3.6 m telescope. This paper discusses 95 observations of 44 stars.
G. Mathys, S. Hubrig
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Compact Spectral Imaging: A Review of Miniaturized and Integrated Systems
Laser &Photonics Reviews, Volume 19, Issue 21, November 6, 2025.This review explores the rapid shift toward compact spectral imaging systems by examining four key design paradigms: Do‐It‐Yourself (DIY) platforms, freeform optics, filter‐on‐chip integration, and multifunctional metasurfaces. The discussion highlights critical applications in medicine, agriculture, and environmental monitoring, providing comparative ...
Sani Mukhtar, Amir Arbabi, Jaime Viegas
wiley +1 more source
Spectropolarimetry of five changing-look active galactic nuclei
Astronomy & AstrophysicsContext. A growing number of active galactic nuclei (AGNs) show dramatic changes in their spectral classification. The mechanisms behind the appearance and disappearance of the optical broad emission lines, as well as the brightening or fading of AGNs ...
Marin F., Hutsemékers D., Biedermann J.
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Spectropolarimetry of O supergiants [PDF]
Monthly Notices of the Royal Astronomical Society, 2002 We present medium-resolution spectropolarimetry at high signal-to-noise ratio of the Hα emission line of 20 O-type supergiants. Five stars (25 per cent) of the sample show a statistically significant change in polarization through the line. We combine our Hα data with new K-band spectropolarimetry and archival low-resolution optical spectropolarimetry ...
Tim J. Harries +2 more
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Chirality in Transition Metal Dichalcogenide Nanostructures
Chemistry – A European Journal, Volume 31, Issue 35, June 23, 2025.The emergence of chirality in inorganic nanostructures has a critical impact on the properties and potential applications of these novel nanomaterials. This work presents a critical collection of examples of the observation of chirality in TMDs, covering different synthetic procedures and origins of chirality as well as a broad range of dimensionality ...
Lorenzo Branzi +3 more
wiley +1 more source
ChemBioChem, Volume 26, Issue 8, April 14, 2025.Organomercury derivatives of 6‐phenylcarbazole can stabilize triple helices when placed at the termini of triplex‐forming homothymine oligonucleotides. In some cases, this stabilization could be attributed to direct coordination of a Hg(II) ion to adenine‐N7 or cytosine‐N4.
Dattatraya Uttam Ukale, Tuomas Lönnberg
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First X-Ray and Radio Polarimetry of the Neutron Star Low-mass X-Ray Binary GX 17+2
The Astrophysical JournalWe report the first polarimetric results of the neutron star low-mass X-ray binary Z-source GX 17+2 using the Imaging X-ray Polarimetry Explorer (IXPE) and the Very Large Array (VLA).
Unnati Kashyap +7 more
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Astronomy & AstrophysicsContext. Neutral helium (He I) produces several spectral lines that are widely used for solar diagnostics. The role of collisions between He I atoms and neutral hydrogen (H I) in the modeling of solar He I lines remains insufficiently quantified ...
Derouich M., Qutub S.
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Proteins: Structure, Function, and Bioinformatics, Volume 93, Issue 4, Page 831-854, April 2025.ABSTRACT Intrinsically disordered regions (IDRs) of proteins remain understudied with enigmatic sequence features relevant to their functions. Members of the myotubularin‐related protein (MTMR) family contain uncharacterized IDRs. After decades of research on their phosphatase activity, recent work on the C‐terminal IDRs of MTMR7 revealed new ...
Daniel Saar +4 more
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Image Instabilities and Polarization Crosstalk
The Astrophysical JournalWe expand on our previous study of the impact of atmospheric seeing on polarization crosstalk, and show how the formalism that was developed in that work can be applied to treat the case of spatial modulators of polarization.
R. Casini, A. G. de Wijn
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