Zobrazeno 1 - 10
of 91
pro vyhledávání: '"Nordsieck, Kenneth"'
Autor:
Gootkin, Keyan, Dorn-Wallenstein, Trevor, Lomax, Jamie R., Eadie, Gwendolyn, Levesque, Emily M., Babler, Brian, Hoffman, Jennifer L., Meade, Marilyn R., Nordsieck, Kenneth, Wisniewski, John P.
We report on over 13 years of optical and near-ultraviolet spectropolarimetric observations of the famous Luminous Blue Variable (LBV), P Cygni. LBVs are a critical transitional phase in the lives of the most massive stars, and achieve the largest ma
Externí odkaz:
http://arxiv.org/abs/2008.03777
Autor:
Fullard, Andrew G., Hoffman, Jennifer L., DeKlotz, Sophia, Luchtan, Daniel Azancot, Cooper, Kevin, Nordsieck, Kenneth H.
Publikováno v:
Andrew G. Fullard et al. 2018 Res. Notes AAS 2 37
We present new spectropolarimetric data for WR 42 collected over 6 months at the 11-m Southern African Large Telescope (SALT) using the Robert Stobie Spectrograph.
Comment: 2 pages, 1 figure, accepted for publication in RNAAS
Comment: 2 pages, 1 figure, accepted for publication in RNAAS
Externí odkaz:
http://arxiv.org/abs/1805.08109
Autor:
Lomax, Jamie R., Fullard, Andrew G., Malatesta, Michael A., Babler, Brian, Bednarski, Daniel, Berdis, Jodi R., Bjorkman, Karen S., Bjorkman, Jon E., Carciofi, Alex C., Davidson Jr., James W., Keil, Marcus, Meade, Marilyn R., Nordsieck, Kenneth, Scheffler, Matt, Hoffman, Jennifer L., Wisniewski, John P.
We analyze 45 spectropolarimetric observations of the eclipsing, interacting binary star V356 Sgr, obtained over a period of 21 years, to characterize the geometry of the system's circumstellar material. After removing interstellar polarization from
Externí odkaz:
http://arxiv.org/abs/1609.07489
Publikováno v:
2012, AIP Conference Proceedings 1429, "Stellar Polarimetry: From Birth to Death," eds. J.L. Hoffman, J.E. Bjorkman, and B.A. Whitney (New York: AIP), 289
On the final day of the Stellar Polarimetry conference, participants split up into three "breakout sessions" to discuss the future of the field in the areas of instrumentation, upcoming opportunities, and community priorities. This contribution compi
Externí odkaz:
http://arxiv.org/abs/1205.2159
Autor:
Bryant, Julia J., Motohara, Kentaro, Vernet, Joël R. D., Groenewald, Danièl, Nordsieck, Kenneth
Publikováno v:
Proceedings of SPIE; July 2024, Vol. 13096 Issue: 1 p130962Q-130962Q-13, 12965252p
Autor:
Nordsieck, Kenneth
Yan and Lazarian have proposed a new technique through which the magnetic field geometry in the diffuse interstellar medium, or in circumstellar matter, could be determined from the linear polarization of interstellar absorption or fluorescence emiss
Externí odkaz:
http://arxiv.org/abs/0809.3802
We report the discovery of optical ghosts generated when using Volume Phase Holographic (VPH) gratings in spectrographs employing the Littrow configuration. The ghost is caused by light reflected off the detector surface, recollimated by the camera,
Externí odkaz:
http://arxiv.org/abs/0708.0402
Autor:
Sheinis, Andrew I., Wolf, Marsha J., Bershady, Matthew A., Buckley, David A. H., Nordsieck, Kenneth H., Williams, Ted B.
The near infrared (NIR) upgrade to the Robert Stobie Spectrograph (RSS) on the Southern African Large Telescope (SALT), RSS/NIR, extends the spectral coverage of all modes of the visible arm. The RSS/NIR is a low to medium resolution spectrograph wit
Externí odkaz:
http://arxiv.org/abs/astro-ph/0606095
Autor:
Clayton, Geoffrey C., Wolff, Michael J., Gordon, Karl D., Smith, Paul S., Nordsieck, Kenneth H., Babler, Brian L.
The wavelength dependence of interstellar polarization due to dust in M31 has been observed along four sightlines. Only one sightline had been measured previously.The globular clusters, S78, S150, S233 and Baade 327 were used as point sources to prob
Externí odkaz:
http://arxiv.org/abs/astro-ph/0403246
Publikováno v:
Astrophys.J.598:572-587,2003
We present the results of a Monte Carlo radiative transfer code that calculates the polarization produced by multiple Thomson scattering and variable absorptive opacity in a circumstellar disk around one component of a close detached binary system. W
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307261