Results 41 to 50 of about 3,094 (200)

Basics of spectropolarimetry [PDF]

Proceedings of the International Astronomical Union, 2014
AbstractMany astronomical sources of radiation emit polarised radiation, for example because of the presence of a disk which produces linear polarisation by scattering some photospheric radiation, or because of the presence of a magnetic field, which leads to circular and sometimes linear polarisation of spectral line profiles. Measuring the wavelength
openaire   +1 more source

Spectropolarimetry of Comet Halley [PDF]

International Astronomical Union Colloquium, 1991
Abstract Spectropolarimetric observations from 3800 to 7000 Å were obtained for the nucleus of comet Halley for nine nights during 1985-86. The observations were spaced over phase angle of 2 to 66 °. The continuum polarization without molecular-line contamination as well as the polarization of the molecular lines were evaluated.
N. Visvanathan, Z. Meglick, D.T. Wickramasinghe   +2 more
openaire   +1 more source

SPIRou: NIR velocimetry and spectropolarimetry at the CFHT [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT This paper presents an overview of SPIRou, the new-generation near-infrared spectropolarimeter/precision velocimeter recently installed on the 3.6-m Canada–France–Hawaii Telescope (CFHT). Starting from the two main science goals, i.e., the quest for planetary systems around nearby M dwarfs and the study of magnetized star/planet
Donati, J-F, Kouach, D, Moutou, C., Doyon, R., Delfosse, X., Artigau, É., Baratchart, S., Lacombe, M., Barrick, G, Hébrard, G., Bouchy, F, Saddlemyer, L, Parès, L, Rabou, P, Micheau, Y, Dolon, F, Reshetov, V, Challita, Z, Carmona, A, Striebig, N, Thibault, S, Martioli, E, Cook, N, Fouqué, P, Vermeulen, T, Wang, S, Arnold, L, Pepe, F, Boisse, I, Figueira, P, Bouvier, J, Ray, T, Feugeade, C, Morin, J, Alencar, S, Hobson, M, Castilho, B, Udry, Stéphane, Santos, N, Hernandez, O, Benedict, T, Vallée, P, Gallou, G, Dupieux, M, Larrieu, M, Perruchot, S, Sottile, R, Moreau, F, Usher, C, Baril, M, Wildi, F, Chazelas, B, Malo, L, Bonfils, Xavier, Loop, D, Kerley, D, Wevers, I, Dunn, J, Pazder, J, Macdonald, S, Dubois, B, Carrié, E, Valentin, H, Henault, F, Yan, C, Steinmetz, T   +65 more
openaire   +5 more sources

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
openaire   +1 more source

Cancer‐Associated BCL‐2 Mutants Reveal Mechanisms Towards Venetoclax Resistance

Advanced Science, Volume 13, Issue 57, 14 October 2026.
Venetoclax (VEN) resistance in chronic lymphocytic leukemia arises from diverse BCL2 mutations. We map mechanisms contributing to VEN resistance across common BCL‐2 variants. G101V and D103Y reduce drug binding and increase sequestration of pro‐apoptotic proteins. V156D blocks VEN allosterically.
Jonas Aufdermauer, Ian de Ridder, Mahjoobeh Ehsani, Marasim Khan, Justin Kale, Lukas P. Frenzel, David Andrews, Spyridoula Karamanou, Ana J. Garcia‐Saez, Geert Bultynck   +9 more
wiley   +1 more source

Snapshot spectropolarimetry

, 2002
Channeled spectropolarimetry is a novel method of measuring the spectral dependence of the polarization state of light. Amplitude modulation is employed to encode all four Stokes component spectra into a single optical power spectrum.
Sabatke, Derek S.
core   +2 more sources

Spectropolarimetry of sunspot penumbrae [PDF]

, 2022
Sunspots, the most prominent manifestation of the solar magnetism, are fascinating research subjects. Especially sunspot penumbrae, with their high structuring, have attracted much attention from which ample observational and theoretical scientific work has originated.
Bello González, Nazaret, Kneer, Franz, Georg-August-Universität Göttingen, Kneer, Franz, Schüssler, Manfred   +4 more
openaire   +3 more sources

Do's and Don'ts When Visiting Circularly Polarized Luminescence

Advanced Optical Materials, Volume 14, Issue 11, 20 March 2026.
This perspective presents our insights into the principles, challenges, and opportunities of circularly polarized luminescence (CPL). Highlighting key concepts such as the dissymmetry factor (glum) and molecular design strategies, we discuss advances in CPL efficiency, emerging NIR emitters, solid‐state applications, and the growing role of theory and ...
Rafael G. Uceda, Sandra Míguez‐Lago, Carlos M. Cruz, Sara P. Morcillo, Luis Álvarez de Cienfuegos, Víctor Blanco, Araceli G. Campaña, Maria Ribagorda, Delia Miguel, Juan M. Cuerva   +9 more
wiley   +1 more source

Intermediate-Mass Mergers: A New Scenario for Several FS CMa Stars

Galaxies
We summarise the properties and nature of a peculiar group of B-type stars called FS CMa stars. These stars show the B[e] phenomenon, i.e., their spectra exhibit both forbidden emission lines and infrared excess.
Daniela Korčáková, Nela Dvořáková, Iris Bermejo Lozano, Gregg A. Wade, Alicia Moranchel Basurto, Pavel Kroupa, Raul Ortega Chametla, Colin Peter Folsom, Ondrej Juhás   +8 more
doaj   +1 more source

VLT-spectropolarimetry of the high-polarization Seyfert 1 galaxy Fairall 51

, 2001
We present high-precision optical spectropolarimetry of the Seyfert 1 galaxy Fairall 51 ...
H. M. Schmid, I. Appenzeller, H. Schild, M. Dietrich, J. Heidt, M. Camenzind, S. Wagner   +6 more
core   +1 more source