Results 71 to 80 of about 9,582 (206)

Stellar evolution with rotation VII: Low metallicity models and the blue to red supergiant ratio in the SMC [PDF]

, 2001
We calculate a grid of models with and without the effects of axial rotation for massive stars in the range of 9 to 60 M$_{\odot}$ and metallicity $Z$ = 0.004 appropriate for the SMC.
A. Maeder, Angulo, Arnett, Baglin, Bertelli, Brocato, Caughlan, Caughlan, Charbonnel, Chin, Claret, de Jager, Fagotto, Flower, Friend, G. Meynet, Girardi, Heger, Heger, Heger, Henry, Herrero, Humphreys, Iglesias, Izotov, Kucinskas, Kudritzki, Lamers, Langer, Langer, Lauterborn, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Maeder, Meylan, Meynet, Meynet, Meynet, Nugis, Pagel, Peimbert, Sackmann, Schaller, Stothers, Stothers, Sugimoto, Talon, Talon, Thuan, Vanbeveren, Venn, Venn, Venn, Willson, Zahn, Zijlstra   +62 more
core   +8 more sources

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

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

Evolution models of red supergiants [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractThe red supergiant (RSG) phase is a key stage for the evolution of massive stars. The current uncertainties about the mass-loss rates of these objects make their evolution far to be fully understood. In this paper, we discuss some of the physical processes that determine the duration of the RSG phase. We also show how the mass loss affect their
openaire   +1 more source

Is Betelgeuse Really Rotating? Synthetic ALMA Observations of Large-scale Convection in 3D Simulations of Red Supergiants

The Astrophysical Journal Letters
The evolved stages of massive stars are poorly understood, but invaluable constraints can be derived from spatially resolved observations of nearby red supergiants, such as Betelgeuse.
Jing-Ze Ma, Andrea Chiavassa, Selma E. de Mink, Ruggero Valli, Stephen Justham, Bernd Freytag   +5 more
doaj   +1 more source

Luminous and Variable Stars in M31 and M33. III. The Yellow and Red Supergiants and Post-Red Supergiant Evolution

, 2016
Recent supernova and transient surveys have revealed an increasing number of non-terminal stellar eruptions. Though the progenitor class of these eruptions includes the most luminous stars, little is known of the pre-supernova mechanics of massive stars ...
Gordon, Michael S., Humphreys, Roberta M., Jones, Terry J.   +2 more
core   +1 more source

What Physical Factors Influence the Transformation between Blue Supergiants and Red Supergiants?

The Astrophysical Journal
The post-main-sequence evolution of massive stars is highly sensitive to key stellar model parameters, particularly initial rotational velocity and metallicity.
Yun He, Hanfeng Song, Georges Meynet, Andre Maeder, Ruiyu Zhang, Ying Qin, Shitao Qi, Qingli Li, Qiong Zhan   +8 more
doaj   +1 more source

A comprehensive grid of massive binary evolution models for the Galaxy: Surface properties of post-mass-transfer stars

Astronomy & Astrophysics
Context. Massive stars often evolve in binary systems, and the interactions of these systems significantly affect their evolution. Massive stars in the Galaxy serve as valuable test beds for such interactions due to their proximity. Aims. We computed the
Jin Harim, Langer Norbert, Ercolino Andrea, de Mink Selma E.   +3 more
doaj   +1 more source

The massive star population of the Virgo Cluster galaxy NGC 4535

, 2018
We analyzed the massive star population of the Virgo Cluster galaxy NGC 4535 using archival Hubble Space Telescope Wide Field Planetary Camera 2 images in filters F555W and F814W, equivalent to Johnson V and Kron-Cousins I.
Bellas-Velidis, I., Bonanos, A. Z., Gavras, P., Hatzidimitriou, D., Kopsacheili, M., Kourniotis, M., Lianou, S., Moretti, M. I., Nota, A., Pouliasis, E., Sokolovsky, K. V., Spetsieri, Z. T., Yang, M.   +12 more
core   +1 more source

The Red Supergiant Progenitor Luminosity Problem

The Astrophysical Journal
Abstract Analysis of pre-explosion imaging has confirmed red supergiants (RSGs) as the progenitors to Type II-P supernovae (SNe). However, extracting an RSG's luminosity requires assumptions regarding the star’s temperature or spectral type and the corresponding bolometric correction, circumstellar extinction, and possible variability ...
Emma R. Beasor, Nathan Smith, Jacob E. Jencson   +2 more
openaire   +3 more sources