Zobrazeno 1 - 10
of 172
pro vyhledávání: '"K. G. Gayley"'
Autor:
Ignace, K. G. Gayley R.
Publikováno v:
Astrophys.J.708:615-624,2010
We calculate the circularly polarized Stokes V profile for emission lines, formed in hot-star winds threaded with a weak radial magnetic field. For simplicity, the field is treated as a split monopole under the assumptions that it has been radially c
Externí odkaz:
http://arxiv.org/abs/0906.3048
Autor:
C. E. Jones, J. Labadie-Bartz, D. V. Cotton, Y. Nazé, G. J. Peters, D. J. Hillier, C. Neiner, N. D. Richardson, J. L. Hoffman, A. C. Carciofi, J. P. Wisniewski, K. G. Gayley, M. W. Suffak, R. Ignace, P. A. Scowen
Publikováno v:
Astrophysics and Space Science. 367
UV spectroscopy and spectropolarimetry hold the key to understanding certain aspects of massive stars that are largely inaccessible with optical or longer wavelength observations. This is especially true for the rapidly-rotating Be and Bn stars, owin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::890412031356c68aa0749f9dc552b1dc
https://doi.org/10.1007/s10509-022-04127-5
https://doi.org/10.1007/s10509-022-04127-5
Autor:
L. G. Poniatowski, N. D. Kee, J. O. Sundqvist, F. A. Driessen, N. Moens, S. P. Owocki, K. G. Gayley, L. Decin, A. de Koter, H. Sana
Publikováno v:
Astronomy and Astrophysics, 667:A113. EDP Sciences
Context. In accelerating and supersonic media, understanding the interaction of photons with spectral lines can be of utmost importance, especially in an accelerating flow. However, fully accounting for such line forces is computationally expensive a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::465ed75a7e45f95b32420814ec570e2a
https://lirias.kuleuven.be/handle/20.500.12942/709199
https://lirias.kuleuven.be/handle/20.500.12942/709199
Autor:
L. G. Poniatowski, N. D. Kee, J. O. Sundqvist, F. A. Driessen, N. Moens, S. P. Owocki, K. G. Gayley, L. Decin, A. de Koter, H. Sana
The table presented gives the line strength distribution parameters \alpha, \bar{Q}, Q_0 and Thompson scattering mass absorption coefficient \kappa_e. Each of these parameters is given as a function of mass density \rho and temperature T of the gas.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53d4962f3eda1b1c7b3aca335fb791aa
Autor:
David P. Huenemoerder, Wolf-Rainer Hamann, Lidia M. Oskinova, Jennifer Lauer, Wayne L. Waldron, Yaël Nazé, Richard Ignace, Noel D. Richardson, N. A. Miller, K. G. Gayley, Joy S. Nichols, Anthony F. J. Moffat
We have obtained a very deep exposure (813 ks) of $\zeta\,$Puppis (O4 supergiant) with the Chandra/HETG Spectrometer. Here we report on analysis of the 1-9 \r{A} region, especially well suited for Chandra, which has a significant contribution from co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::85ff7bf3f04e27ac43be86a927682490
http://arxiv.org/abs/2003.06889
http://arxiv.org/abs/2003.06889
X-ray spectroscopy of massive stellar winds: previous and ongoing observations of the hot star ζ Pup
Autor:
Richard Ignace, T. Ramiaramanantsoa, David P. Huenemoerder, N. A. Miller, Wayne L. Waldron, Jennifer Lauer, Lidia M. Oskinova, Noel D. Richardson, Tomer Shenar, Yaël Nazé, Matthew Dahmer, Joy S. Nichols, Anthony F. J. Moffat, K. G. Gayley
Publikováno v:
Proceedings of the International Astronomical Union. 14:88-92
The stellar winds of hot stars have an important impact on both stellar and galactic evolution, yet their structure and internal processes are not fully understood in detail. One of the best nearby laboratories for studying such massive stellar winds
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2be83199fd81ad59a50b9b56470660b5
https://doi.org/10.1017/s1743921319001340
https://doi.org/10.1017/s1743921319001340
Autor:
Véronique Petit, Jon O. Sundqvist, Stanley P. Owocki, Maurice A. Leutenegger, K. G. Gayley, Zequn Li, David H. Cohen
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 444:3729-3737
We present a new method for using measured X-ray emission line fluxes from O stars to determine the shock-heating rate due to instabilities in their radiation-driven winds. The high densities of these winds means that their embedded shocks quickly co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c836a4816b1fca2a4cae7970667683e3
https://doi.org/10.1093/mnras/stu1661
https://doi.org/10.1093/mnras/stu1661
Autor:
Markus Schöller, Lidia M. Oskinova, K. G. Gayley, Ilya Ilyin, Wolf-Rainer Hamann, Richard Ignace, K. Scholz, Swetlana Hubrig
To investigate if magnetic fields are present in Wolf-Rayet stars, we selected a few stars in the Galaxy and one in the Large Magellanic Cloud (LMC). We acquired low-resolution spectropolarimetric observations with the ESO FORS2 instrument during two
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d607fe1677db0e5c40ad8bb407ed4309
http://arxiv.org/abs/1603.01441
http://arxiv.org/abs/1603.01441
Publikováno v:
Astroparticle Physics. 34:293-303
In the past decade there have been several attempts to detect Ultra High Energy (UHE) neutrinos via radio Ĉerenkov bursts in terrestrial ice or the lunar regolith. So far these searches have yielded no detections, but the inferred flux upper limits
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ab53930013f006598d197b000849b53
https://doi.org/10.1016/j.astropartphys.2010.08.008
https://doi.org/10.1016/j.astropartphys.2010.08.008
Publikováno v:
The Astrophysical Journal. 706:1556-1570
We derive analytic expressions and approximate them in closed form, for the effective detection aperture for Cerenkov radio emission from ultra-high-energy neutrinos striking the Moon. The resulting apertures are in good agreement with recent Monte C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aff5a7b7a0a13e0a70aee825a4fa6614
https://doi.org/10.1088/0004-637x/706/2/1556
https://doi.org/10.1088/0004-637x/706/2/1556