Results 61 to 70 of about 3,913,690 (210)

Vibrational Relaxation of D2O Induced by Collision with He: A Rigid Bender Close Coupling Study

ChemPhysChem, Volume 25, Issue 15, August 1, 2024.
The vibrational quenching cross sections for the relaxation of the D2O (ν2=1,3ka,kc) molecule by collision with He are presented. A monotonic increase of the cross sections is observed for high collision energies. Abstract The vibrational relaxation of the first excited bending state of D2O induced by collision with He is studied at the close coupling ...
Ricardo Manuel García‐Vázquez, Lisán David Cabrera‐González, Otoniel Denis Alpizar, Thierry Stoecklin   +3 more
wiley   +1 more source

The Transport of Angular Momentum for Massive Stars. I. Formation of Slowly Rotating Early-type Nitrogen-sequence Wolf–Rayet Stars

The Astrophysical Journal
The evolutionary scenario of early-type nitrogen-sequence Wolf–Rayet (WNE) stars predicts a slowly rotating subclass that typically forms after the red supergiant phase.
Jijuan Si, Yan Li, Xue-Feng Li, Zhi Li
doaj   +1 more source

The Time-averaged Mass-loss Rates of Red Supergiants as Revealed by Their Luminosity Functions in M31 and M33

The Astrophysical Journal, 2023
Mass loss in red supergiants (RSGs) is generally recognized to be episodic, but mass-loss prescriptions fail to reflect this. Evolutionary models show that the total amount of mass lost in this phase determines if these stars evolve to warmer ...
Philip Massey, Kathryn F. Neugent, Sylvia Ekström, Cyril Georgy, Georges Meynet   +4 more
doaj   +1 more source

Probing extreme black‐hole outflows on short timescales via high spectral‐resolution x‐ray imagers

Astronomische Nachrichten, Volume 345, Issue 6-7, July-August 2024.
Abstract We investigate outflows and the physics of super‐Eddington versus sub‐Eddington regimes in black hole systems. Our focus is on prospective science using next‐generation high‐resolution soft x‐ray instruments. We highlight the properties of black hole ultraluminous x‐ray source (ULX) systems in particular. Owing to scale invariance in accreting
C. Pinto, J. F. Steiner, A. Bodaghee, P. Chakraborty, M. Sobolewska, D. R. Pasham, A. Ogorzalek, J. Zuhone, A. Bogdan, M. Vogelsberger   +9 more
wiley   +1 more source

Red supergiant star studies with CO5BOLD and Optim3D

, 2013
We describe recent work focused towards a better understanding of red supergiant stars using 3D radiative-hydrodynamics (RHD) simulations with CO5BOLD. A small number of simulations now exist that span up to seven years of stellar time, at various numerical resolutions. Our discussion concentrates on interferometric and spectroscopic observations.
Plez, Bertrand, Chiavassa, A.
openaire   +3 more sources

An Interferometric Imaging Survey of Red Supergiant Stars

, 2021
Red supergiant stars (RSGs) are an end stage of massive star evolution. Among the notable behaviors of stars during this stage are their irregular and semi-regular variability and mass-loss. In order to better understand the sources of these phenomena, we collected high resolution optical interferometric observations of 17 RSGs using the Center for ...
openaire   +1 more source

Characterizing the dynamical magnetosphere of the extremely slowly rotating magnetic O9.7 V star HD 54879 using rotational modulation of the Hα profile

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract The magnetic field in the O9.7 V star HD 54879 has been monitored for almost a decade. Spectropolarimetric observations reveal a rather strong mean longitudinal magnetic field that varies with a period of about 7.41 years. Observations in the Hα$$ \alpha $$ line show a variation with the same period, while the Hβ$$ \beta $$ line shows only ...
Manfred Küker, S. P. Järvinen, S. Hubrig, Ilya Ilyin, M. Schöller   +4 more
wiley   +1 more source

Ejecting the envelope of red supergiant stars with jets launched by an inspiralling neutron star

Monthly Notices of the Royal Astronomical Society, 2015
We study the properties of jets launched by a neutron star spiralling inside the envelope and core of a red supergiant. We propose that Thorne-Zytkow objects (TZO) are unlikely to be formed via common envelope (CE) evolution if accretion on to the neutron star can exceed the Eddington rate with much of the accretion energy directed into jets that ...
Papish, Oded, Soker, Noam, Bukay, Inbal
openaire   +2 more sources

Red Supergiant Stars as Cosmic Abundance Probes: KMOS Observations in NGC 6822 [PDF]

, 2015
International audienceWe present near-IR spectroscopy of red supergiant (RSG) stars in NGC 6822, obtained with the new VLT-KMOS instrument. From comparisons with model spectra in the J-band we determine the metallicity of 11 RSGs, finding a mean value of
Bergemann, M., Gazak, J., Patrick, L., Evans, C., Davies, B., Plez, Bertrand, Kudritzki, R-P., Ferguson, M.   +7 more
core   +2 more sources

SN 2023ixf: The Closest Supernova of the Decade

Universe
Supernova 2023ixf occurred on 18 May 2023 in the nearby galaxy Messier 101 (D≈6.85 Mpc), making it the closest supernova in the last decade. Following its discovery, astronomers around the world rushed to observe the explosion across the electromagnetic ...
Wynn Jacobson-Galán
doaj   +1 more source