Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Owocki, Stan"'
Autor:
Owocki, Stan
Both stars and planets can lose mass through an expansive wind outflow, often constrained or channeled by magnetic fields that form a surrounding magnetosphere. The very strong winds of massive stars are understood to be driven by line-scattering of
Externí odkaz:
http://arxiv.org/abs/2210.17472
Autor:
ud-Doula, Asif, Owocki, Stan
Many stars across all classes possess strong enough magnetic fields to influence dynamical flow of material off the stellar surface. For the case of massive stars (O and B types), about 10\% of them harbour strong, globally ordered (mostly dipolar) m
Externí odkaz:
http://arxiv.org/abs/2209.08540
Autor:
Owocki, Stan
Most of a star's mass is bound in a hydrostatic equilibrium in which pressure balances gravity. But if at some near-surface layer additional outward forces overcome gravity, this can transition to a supersonic, outflowing wind, with the sonic point,
Externí odkaz:
http://arxiv.org/abs/2202.05434
Autor:
Gayley, Ken, Vink, Jorick S., ud-Doula, Asif, David-Uraz, Alexandre, Ignace, Richard, Prinja, Raman, St-Louis, Nicole, Ekström, Sylvia, Nazé, Yaël, Shenar, Tomer, Scowen, Paul A., Sudnik, Natallia, Owocki, Stan P., Sundqvist, Jon O., Driessen, Florian A., Hennicker, Levin
The most massive stars are thought to lose a significant fraction of their mass in a steady wind during the main-sequence and blue supergiant phases. This in turn sets the stage for their further evolution and eventual supernova, with consequences fo
Externí odkaz:
http://arxiv.org/abs/2111.11633
PolStar -- An Explorer-Class FUV Spectropolarimetry Mission to Map the Environments of Massive Stars
Autor:
Scowen, Paul, Ignace, Richard, Neiner, Coralie, Wade, Gregg, Beasley, Matt, Bjorkman, Jon, Bouret, Jean-Claude, Casini, Roberto, Alemán, Tanausu del Pino, Edgington, Samantha, Gayley, Ken, Guinan, Ed, Hoffman, Jennifer, Howarth, Ian, Hull, Tony, Sainz, Rafael Manso, Naze, Yael, Nordt, Alison, Owocki, Stan, Petrinec, Steve, Prinja, Raman, Sana, Hugues, Shultz, Matt, Sparks, William, St-Louis, Nicole, Tillier, Clem, Bueno, Javier Trujillo, Vasudevan, Gopal, Woodruff, Bob
PolStar is an Explorer-class far ultraviolet (FUV) spectropolarimetry mission designed to target massive stars and their environments. PolStar will take advantage of resonance lines only available in the FUV to measure for the first time the magnetic
Externí odkaz:
http://arxiv.org/abs/1911.06724
In studying the formation of massive stars, it is essential to consider the strong radiative feedback on the stars' natal environments from their high luminosities ($10^4 \sim 10^6 L_\odot$). Given that massive stars contract to main-sequence-like ra
Externí odkaz:
http://arxiv.org/abs/1806.08753
Autor:
David-Uraz, Alexandre, Wade, Gregg, Moffat, Anthony, Owocki, Stan, Petit, Véronique, team, the BRITE
In this contribution, we present BRITE observations of the early-B supergiants $\epsilon$ Ori and $\kappa$ Ori. We perform a preliminary analysis of the data acquired over the first two Orion observing runs. We evaluate whether they are compatible wi
Externí odkaz:
http://arxiv.org/abs/1711.08394
We extend our previous study of radiative ablation of circumstellar disks by line-scattering of the star's radiation, accounting now for the effect of multiple line resonances off the stellar limb. For an analytic, three-dimensional model of the velo
Externí odkaz:
http://arxiv.org/abs/1710.09312
Autor:
Sikora, James, Wade, Gregg, Bohlender, David, Neiner, Coralie, Oksala, Mary, Shultz, Matt, Cohen, David, ud-Doula, Asif, Grunhut, Jason, Monin, Dmitry, Owocki, Stan, Petit, Véronique, Rivinius, Thomas, Townsend, Richard
In this paper we report 23 magnetic field measurements of the B3IV star HD 23478: 12 obtained from high resolution Stokes $V$ spectra using the ESPaDOnS (CFHT) and Narval (TBL) spectropolarimeters, and 11 from medium resolution Stokes $V$ spectra obt
Externí odkaz:
http://arxiv.org/abs/1505.02427
Autor:
Pablo, Herbert, Richardson, Noel D., Moffat, Anthony F. J., Corcoran, Michael, Shenar, Tomer, Benvenuto, Omar, Fuller, Jim, Naze, Yael, Hoffman, Jennifer L., Miroshnichenko, Anatoly, Apellaniz, Jesus Maiz, Evans, Nancy, Eversberg, Thomas, Gayley, Ken, Gull, Ted, Hamaguch, Kenji, Hamann, Wolf-Rainer, Henrichs, Huib, Hole, Tabetha, Ignace, Richard, Iping, Rosina, Lauer, Jennifer, Leutenegger, Maurice, Lomax, Jamie, Nichols, Joy, Oskinova, Lida, Owocki, Stan, Pollock, Andy, Russell, Christopher M. P., Waldron, Wayne, Buil, Christian, Garrel, Thierry, Graham, Keith, Heathcote, Bernard, Lemoult, Thierry, Li, Dong, Mauclaire, Benjamin, Potter, Mike, Ribeiro, Jose, Matthews, Jaymie, Cameron, Chris, Guenther, David, Kuschnig, Rainer, Rowe, Jason, Rucinski, Slavek, Sasselov, Dimitar, Weiss, Werner
Publikováno v:
ApJ, 809, 134 (11p,2015)
We report on both high-precision photometry from the MOST space telescope and ground-based spectroscopy of the triple system delta Ori A consisting of a binary O9.5II+early-B (Aa1 and Aa2) with P = 5.7d, and a more distant tertiary (O9 IV P > 400 yrs
Externí odkaz:
http://arxiv.org/abs/1504.08002