Results 61 to 70 of about 9,582 (206)
The Astrophysical Journal, 2023 Betelgeuse, the nearest red supergiant, dimmed to an unprecedented level in early 2020. The star emerged from this “Great Dimming” episode with its typical, roughly 400 days pulsation cycle halved, and a new dominant period of around 200 days.
Morgan MacLeod +4 more
doaj +1 more source
Red Supergiants in the Local Group
, 2013 Galaxies in the Local Group span a factor of 15 in metallicity, ranging from the super-solar M31 to the Wolf-Lundmark-Melotte (WLM) galaxy, which is the lowest-metallicity (0.1xZsun) Local Group galaxy currently forming stars.
Levesque, Emily M.
core +1 more source
Micritisation products in the inner ramp settings of the Abu Dhabi Lagoon
The Depositional Record, Volume 10, Issue 4, Page 402-425, September 2024.Journey inside carbonate grains; internal microstructures of micritic envelopes and peloids in the Abu Dhabi lagoon. Abstract In numerous carbonate reservoirs in the Middle East, peloidal packstone‐grainstones are rock types with excellent pore storage potential in micritised microporous grains.
Thomas Teillet +7 more
wiley +1 more source
Tomography of the red supergiant star μ Cep
Proceedings of the International Astronomical Union, 2018 AbstractA tomographic method, aiming at probing velocity fields at depth in stellar atmospheres, is applied to the red supergiant star μ Cep and to snapshots of 3D radiative-hydrodynamics simulation in order to constrain atmospheric motions and relate them to photometric variability.
K. Kravchenko +5 more
openaire +4 more sources
Red supergiants as supernova progenitors [PDF]
Proceedings of the International Astronomical Union, 2015 AbstractRecent searches for supernova II-P progenitors in external galaxies have led to the identification of red objects with magnitudes and colours indicative of red supergiants, in most cases implying quite low luminosities, and hence masses. Current results would suggest that all explosions come from objects less massive than ~ 18 M⊙ and that some ...
Ignacio Negueruela +3 more
openaire +1 more source
Molecules and Chemistry in Red Supergiants
GalaxiesThe envelopes of Red Supergiants (RSGs) have a unique chemical environment not seen in other types of stars. They foster an oxygen-rich synthesis but are tempered by sporadic and chaotic mass loss, which distorts the envelope and creates complex outflow ...
Lucy M. Ziurys, Anita M. S. Richards
doaj +1 more source
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 +3 more
wiley +1 more source
Red Supergiant Mass Loss and Mass-Loss Rates
GalaxiesThis review discusses the causes, nature, importance and observational evidence of mass loss by red supergiants. It arrives at the perception that mass loss finds its origin in the gravity which makes the star a star in the first place, and is a ...
Jacco Th. van Loon
doaj +1 more source
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 +4 more
doaj +1 more source
Yellow and Red Supergiants in the Large Magellanic Cloud
, 2012 Due to their transitionary nature, yellow supergiants provide a critical challenge for evolutionary modeling. Previous studies within M31 and the SMC show that the Geneva evolutionary models do a poor job at predicting the lifetimes of these short-lived ...
Ardeberg +65 more
core +1 more source