Results 71 to 80 of about 12,394 (217)

Near-IR Spectra of Red Supergiants and Giants. I- Models with Solar and with Mixing-Induced Surface Abundance Ratios

, 2007
We provide a grid of PHOENIX spectra of red giant and supergiant stars, that extend through optical and near-IR wavelengths. For the first time, models are also provided with modified surface abundances of C, N and O, as a step towards accounting for the
A. Lançon, Anders, Baldwin, Beer, Bessell, Bessell, Bessell, Boothroyd, Bressan, Cardelli, Charbonnel, Charbonnel, D. Ladjal, Decin, do Nascimento, Frogel, Girardi, Goorvitch, Goorvitch, Iben, Iben, Iben, Keenan, Kucinskas, Kucinskas, Lançon, Levesque, Levesque, Loidl, M. Mouhcine, Maeder, Maeder, Martins, McGregor, McWilliam, Meynet, Meynet, Meynet, Origlia, Origlia, P. H. Hauschildt, Schaller, Smith, Trundle, Tsuji, van Belle, Vanhollebeke, White, Wing   +48 more
core   +1 more source

B-type supergiants in the SMC: Rotational velocities and implications for evolutionary models [PDF]

, 2005
High-resolution spectra for 24 SMC and Galactic B-type supergiants have been analysed to estimate the contributions of both macroturbulence and rotation to the broadening of their metal lines. Two different methodologies are considered, viz.
Bouret, C. Trundle, Carroll, Carroll, Crowther, D. J. Lennon, Dufton, Ebbets, Gray, Gray, Heger, Hillier, Howarth, Howarth, Hubeny, Hubeny, Lennon, Maeder, Maeder, Maeder, Maeder, McErlean, McErlean, Meynet, Meynet, Meynet, Meynet, P. L. Dufton, R. S. I. Ryans, Ryans, S. Simón-Díaz, Santolaya-Rey, Schaller, Simón-Díaz, Simón-Díaz, Smith, Trundle, Venn   +37 more
core   +1 more source

The regional economics of mineral resource wealth in Africa

Economica, Volume 91, Issue 364, Page 1424-1453, October 2024.
Abstract We study the regional economics of mineral resource activity in Africa. Using geocoded data on mine openings and closures in Africa, we document that mining regions experience local economic booms while a mine is in operation. We then explore how mineral resources affect non‐mining regions.
Zareh Asatryan, Thushyanthan Baskaran, Carlo Birkholz, Patrick Hufschmidt   +3 more
wiley   +1 more source

Molecules and Chemistry in Red Supergiants

Galaxies
The 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

Critical Metallicity of Cool Supergiant Formation. I. Effects on Stellar-mass Loss and Feedback

The Astrophysical Journal, 2023
This paper systematically studies the relation between metallicity and mass loss of massive stars. We perform one-dimensional stellar evolution simulations and build a grid of ∼2000 models with initial masses ranging between 11 and 60 M _⊙ and absolute ...
Po-Sheng Ou, Ke-Jung Chen, You-Hua Chu, Sung-Han Tsai   +3 more
doaj   +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, Mohamed Harkat, Kai Hachmann, Elisa Garuglieri, Viswasanthi Chandra, Daniele Daffonchio, Mónica Sánchez‐Román, Volker Vahrenkamp   +7 more
wiley   +1 more source

A comprehensive catalogue of high-mass X-ray binaries in the Large Magellanic Cloud detected during the first eROSITA all-sky survey

Astronomy & Astrophysics
Context. The Magellanic Clouds, the closest star-forming galaxies to the Milky Way, offer an excellent environment to study high-mass X-ray binaries (HMXBs).
Kaltenbrunner D., Maitra C., Haberl F., Bodensteiner J., Bogensberger D., Buckley D. A. H., Cioni M. R. L., Greiner J., Monageng I., Udalski A., Vasilopoulos G., Willer R.   +11 more
doaj   +1 more source

AKARI's infrared view on nearby stars : Using AKARI Infrared Camera All-Sky Survey, 2MASS, and Hipparcos catalog [PDF]

, 2010
--Results-- We found that the (B-V) v.s. (V-S9W) color-color diagram is useful to identify the stars with infrared excess emerged from circumstellar envelopes/disks.
Andrews, Beckwith, Bertout, Bessell, Biazzo, Blum, Busa, Cenarro, Chokshi, D. Ishihara, De Medeiros, De Medeiros, Fazio, Gras-Velazquez, Groenewegen, Gruendl, H. Fujiwara, H. Kataza, H. Matsuhara, Hauser, Hony, I. Yamamura, Ishihara, Ita, Ita, Justtanont, Kawada, Kozasa, Kraemer, Lada, Lançon, Li, Loidl, M. Matsuura, Martin, Massey, Matsuura, Matsuura, Meixner, Mokiem, Murakami, N. Matsunaga, Onaka, Onaka, Pitman, Posch, Puls, Rieke, Rosario, S. Oyabu, S. Takita, Skrutskie, Sloan, Sloan, Sloan, Speck, Speck, Srinivasan, Stephenson, Stephenson, Sylvester, Szczerba, T. Onaka, T. Tanabé, T. Wada, Tanabé, Van Den Ancker, Van Den Ancker, van der Hucht, van der Veen, Waters, Weingartner, Wenger, Whitney, Wright, Y. Ita, Y. Nakada, York, Zhang, Zhang   +79 more
core   +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, Lisán David Cabrera‐González, Otoniel Denis Alpizar, Thierry Stoecklin   +3 more
wiley   +1 more source

On the Spatial Distribution of Luminous Blue Variables, B[e] Supergiants, and Wolf–Rayet Stars in the Large Magellanic Cloud

The Astrophysical Journal
We examine the spatial distributions of luminous blue variables (LBVs), B [ e ] supergiants, and Wolf–Rayet stars (WR) stars in the Large Magellanic Cloud (LMC) to clarify their relative ages, evolutionary states, and relationships. This survey employs a
John C. Martin, Roberta M. Humphreys, Kris Davidson   +2 more
doaj   +1 more source