Results 91 to 100 of about 11,425 (209)

Characterising the post-red supergiant binary system AFGL 4106 and its complex nebula with SPHERE/VLT

Astronomy & Astrophysics
Context. Mass loss in evolved massive stars plays a critical role in shaping their circumstellar environments and enriching the interstellar medium. In binary systems, stellar interactions can further complicate this process, affecting stellar evolution,
Tomassini G., Lagadec E., El Mellah I., Oudmaijer R. D., Chiavassa A., N’Diaye M., de Laverny P., Nardetto N., Matter A.   +8 more
doaj   +1 more source

Stochastic Processes in Yellow and Red Pulsating Variables

, 2009
Random changes in pulsation period are well established in cool pulsating stars, in particular the red giant variables: Miras, semi-regulars of types A and B, and RV Tau variables.
D. G. Turner, J. R. Percy, Joyce Ann Guzik, L. N. Berdnikov, M. Abdel-Sabour Abdel-Latif, Paul A. Bradley, T. Colivas   +6 more
core   +1 more source

An Investigation into the Variability of Luminous Blue Variable Stars with TESS

The Astronomical Journal
Luminous blue variables (LBVs) are enigmatic, evolved, massive stars. Their variability has been observed to be episodic with large eruptions, along with variations on timescales of days to decades.
Becca Spejcher, Noel D. Richardson, Herbert Pablo, Marina Beltran, Payton Butler, Eddie Avila   +5 more
doaj   +1 more source

Mass loss of red supergiants: a key ingredient for the final evolution of massive stars

, 2015
Mass-loss rates during the red supergiant phase are very poorly constrained from an observational or theoretical point of view. However, they can be very high, and make a massive star lose a lot of mass during this phase, influencing considerably the ...
Ekström, Sylvia, Georgy, Cyril
core   +1 more source

Stellar Evolution Through the Red Supergiant Phase

Galaxies
Massive stars less massive than ∼30 M⊙ evolve into a red supergiant after the main sequence. Given a standard IMF, this means about 80% of all single massive stars will experience this phase.
Sylvia Ekström, Cyril Georgy
doaj   +1 more source

A Coronagraphic Pilot Study of the Circumstellar Environments around Red Supergiants: CD -31°4916’s Dust Morphology

The Astronomical Journal
Many mechanisms have been proposed to contribute to massive-star mass loss, but in general little is known about the physics involved. Studies of circumstellar environments around massive stars might help to determine which mechanisms are the most common.
Jamie R. Lomax, Emily M. Levesque, John P. Wisniewski, John H. Debes   +3 more
doaj   +1 more source

The ARAUCARIA project: Grid-Based Quantitative Spectroscopic Study of Massive Blue Stars in NGC55

, 2012
The quantitative study of the physical properties and chemical abundances of large samples of massive blue stars at different metallicities is a powerful tool to understand the nature and evolution of these objects. Their analysis beyond the Milky Way is
A. Herrero, Appenzeller, Asplund, Becker, Becker, Bestenlehner, Bonanos, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Brott, Cardelli, Castro, Charbonneau, Chiosi, Crowther, Davidge, Dunstall, Eber, Evans, Evans, F. Bresolin, G. Pietrzyński, Garcia, Gieren, Gieren, Herrero, Hillier, Hunter, Korn, Kudritzki, Kudritzki, Kudritzki, Kudritzki, Lamers, Lefever, Lefever, Leitherer, Lennon, Lennon, Lyubimkov, M. A. Urbaneja, M. Garcia, Maeder, Markova, Markova, McErlean, Meynet, Mokiem, Mokiem, Mokiem, Monteverde, Monteverde, Muschielok, N. Castro, Pagel, Pietrzyński, Przybilla, Puls, Puls, R.-P. Kudritzki, Repolust, Rivero González, Rolleston, S. Simón-Díaz, Santolaya-Rey, Schaerer, Searle, Seaton, Simón-Díaz, Trundle, Trundle, Trundle, Trundle, U., Urbaneja, Urbaneja, Urbaneja, Urbaneja, Urbaneja, Venn, Venn, Venn, Vink, Vink, W. Gieren, Webster   +88 more
core   +1 more source

Discovery of a young and massive stellar cluster: Spectrophotometric near-infrared study of Masgomas-1

, 2012
Context: Recent near-infrared data have contributed to the discovery of new (obscured) massive stellar clusters and massive stellar populations in previously known clusters in our Galaxy.
A. Herrero, A. Marín-Franch, Benjamin, Brott, Carpenter, Casali, Clark, Clark, Comerón, Davies, Davies, Figer, Hambly, Hanson, Hanson, Hanson, Hanson, Hewett, Hodgkin, Indebetouw, Ivanov, Kroupa, Lawrence, Marigo, Martins, Marín-Franch, Meyer, Negueruela, Negueruela, Peña Ramírez, Ramírez Alegría, Ranada, Ranade, Rieke, Rieke, S. Ramírez Alegría, Salpeter, Skrutskie, Stetson, Vacca, Wallace   +40 more
core   +1 more source

Evolved Massive Stars at Low Metallicity. VII. The Lower Mass Limit of the Red Supergiant Population in the Large Magellanic Cloud

The Astrophysical Journal
The precise definition of the lower mass limit of red supergiant stars (RSGs) is an open question in astrophysics and does not attract much attention.
Ming Yang, Bo Zhang, Biwei Jiang, Jian Gao, Yi Ren, Shu Wang, Man I Lam, Hao Tian, Changqing Luo, Bingqiu Chen, Jing Wen   +10 more
doaj   +1 more source

Evidence for extended chromospheres surrounding red giant stars [PDF]

Observational evidence and theoretical arguments are summarized which indicate that regions of partially ionized hydrogen extending several stellar radii are an important feature of red giant and supergiant stars.
Stencel, R. E.
core   +1 more source