Добірка наукової літератури з теми "Stellar cosmic rays"

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Статті в журналах з теми "Stellar cosmic rays"

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Rodgers-Lee, D., A. M. Taylor, A. A. Vidotto, and T. P. Downes. "Stellar versus Galactic: the intensity of cosmic rays at the evolving Earth and young exoplanets around Sun-like stars." Monthly Notices of the Royal Astronomical Society 504, no. 1 (2021): 1519–30. http://dx.doi.org/10.1093/mnras/stab935.

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ABSTRACT Energetic particles, such as stellar cosmic rays, produced at a heightened rate by active stars (like the young Sun) may have been important for the origin of life on Earth and other exoplanets. Here, we compare, as a function of stellar rotation rate (Ω), contributions from two distinct populations of energetic particles: stellar cosmic rays accelerated by impulsive flare events and Galactic cosmic rays. We use a 1.5D stellar wind model combined with a spatially 1D cosmic ray transport model. We formulate the evolution of the stellar cosmic ray spectrum as a function of stellar rotat
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Mesquita, A. L., D. Rodgers-Lee, and A. A. Vidotto. "The Earth-like Galactic cosmic ray intensity in the habitable zone of the M dwarf GJ 436." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 1817–26. http://dx.doi.org/10.1093/mnras/stab1483.

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ABSTRACT Galactic cosmic rays are energetic particles important in the context of life. Many works have investigated the propagation of Galactic cosmic rays through the Sun’s heliosphere. However, the cosmic ray fluxes in M dwarf systems are still poorly known. Studying the propagation of Galactic cosmic rays through the astrospheres of M dwarfs is important to understand the effect on their orbiting planets. Here, we focus on the planetary system GJ 436. We perform simulations using a combined 1D cosmic ray transport model and 1D Alfvén-wave-driven stellar wind model. We use two stellar wind
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Biermann, Peter L. "Cosmic rays, stellar evolution and supernova physics." New Astronomy Reviews 48, no. 1-4 (2004): 41–46. http://dx.doi.org/10.1016/j.newar.2003.11.006.

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Rodgers-Lee, D., A. A. Vidotto, and A. L. Mesquita. "Charting nearby stellar systems: the intensity of Galactic cosmic rays for a sample of solar-type stars." Monthly Notices of the Royal Astronomical Society 508, no. 4 (2021): 4696–704. http://dx.doi.org/10.1093/mnras/stab2788.

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ABSTRACT Cosmic rays can penetrate planetary atmospheres driving the formation of prebiotic molecules, which are important for the origin of life. We calculate the Galactic cosmic ray fluxes in the habitable zone (HZ) of five nearby, well-studied solar-type stars and at the orbits of two known exoplanets. We model the propagation of Galactic cosmic rays through the stellar winds using a combined 1.5D stellar wind and 1D cosmic ray transport model. We find that the HZ of 61 Cyg A has comparable Galactic cosmic ray fluxes to present-day Earth values. For the other four systems (ϵ Eri, ϵ Ind, ξ B
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de Menezes, Raniere, Elena Orlando, Mattia Di Mauro, and Andrew Strong. "A study of superluminous stars with the Fermi-Large Area Telescope." Monthly Notices of the Royal Astronomical Society 507, no. 1 (2021): 680–86. http://dx.doi.org/10.1093/mnras/stab2150.

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ABSTRACT The γ-ray emission from stars is induced by the interaction of cosmic rays with stellar atmospheres and photon fields. This emission is expected to come in two components: a stellar disc emission, where γ-rays are mainly produced in atmospheric showers generated by hadronic cosmic rays, and an extended halo emission, where the high density of soft photons in the surroundings of stars create a suitable environment for γ-ray production via inverse Compton (IC) scattering by cosmic ray electrons. Besides the Sun, no other disc or halo from single stars has ever been detected in γ-rays. H
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Mesquita, A. L., D. Rodgers-Lee, A. A. Vidotto, D. Atri, and B. E. Wood. "Galactic cosmic ray propagation through M dwarf planetary systems." Monthly Notices of the Royal Astronomical Society 509, no. 2 (2021): 2091–101. http://dx.doi.org/10.1093/mnras/stab3131.

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ABSTRACT Quantifying the flux of cosmic rays reaching exoplanets around M dwarfs is essential to understand their possible effects on exoplanet habitability. Here, we investigate the propagation of Galactic cosmic rays as they travel through the stellar winds (astrospheres) of five nearby M dwarfs, namely: GJ 15A, GJ 273, GJ 338B, GJ 411, and GJ 887. Our selected stars each have one or two detected exoplanets and they all have wind mass-loss rates constrained by Lyman α observations. Our simulations use a combined 1D magnetohydrodynamic (MHD) Alfvén-wave-driven stellar wind model and 1D cosmic
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Joubaud, T., I. A. Grenier, J. M. Casandjian, T. Tolksdorf, and R. Schlickeiser. "The cosmic-ray content of the Orion-Eridanus superbubble." Astronomy & Astrophysics 635 (March 2020): A96. http://dx.doi.org/10.1051/0004-6361/201937205.

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Aims. The nearby Orion-Eridanus superbubble, which was blown by multiple supernovae several million years ago, has likely produced cosmic rays. Its turbulent medium is still energised by massive stellar winds and it can impact cosmic-ray transport locally. The γ radiation produced in interactions between cosmic rays and interstellar gas can be used to compare the cosmic-ray spectrum in the superbubble and in other regions near the Sun. It can reveal spectral changes induced in GeV to TeV cosmic rays by the past and present stellar activity in the superbubble. Methods. We used ten years of data
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Tanaka, S., S. Kitamoto, T. Suzuki, K. Torii, M. F. Corcoran, and W. Waldron. "Chemical Abundances of Early Type Stars." Symposium - International Astronomical Union 188 (1998): 224–25. http://dx.doi.org/10.1017/s007418090011486x.

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X-rays from early-type stars are emitted by the corona or the stellar wind. The materials in the surface layer of early-type stars are not contaminated by nuclear reactions in the stellar inside. Therefore, abundance study of the early-type stars provides us an information of the abundances of the original gas. However, the X-ray observations indicate low-metallicity, which is about 0.3 times of cosmic abundances. This fact raises the problem on the cosmic abundances.
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Tagawa, Hiromichi, Shigeo S. Kimura, and Zoltán Haiman. "High-energy Electromagnetic, Neutrino, and Cosmic-Ray Emission by Stellar-mass Black Holes in Disks of Active Galactic Nuclei." Astrophysical Journal 955, no. 1 (2023): 23. http://dx.doi.org/10.3847/1538-4357/ace71d.

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Abstract Some Seyfert galaxies are detected in high-energy gamma rays, but the mechanism and site of gamma-ray emission are unknown. Also, the origins of the cosmic high-energy neutrino and MeV gamma-ray backgrounds have been veiled in mystery since their discoveries. We propose emission from stellar-mass BHs (sBHs) embedded in disks of active galactic nuclei as their possible sources. These sBHs are predicted to launch jets due to the Blandford–Znajek mechanism, which can produce intense electromagnetic, neutrino, and cosmic-ray emissions. We investigate whether these emissions can be the sou
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Mirabel, I. F. "Microquasars as Sources of High Energy Phenomena." Symposium - International Astronomical Union 214 (2003): 201–10. http://dx.doi.org/10.1017/s0074180900194409.

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Relativistic outflows are a common phenomenon in accreting black holes. Despite the enormous differences in scale, accreting stellar-mass black holes (X-ray binaries, collapsars) and super-massive black holes produce jets with analogous physical properties. Here I review microquasars as sources of relativistic jets, gamma-rays, cosmic rays, and high energy neutrinos.
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Дисертації з теми "Stellar cosmic rays"

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KO, CHUNG-MING. "COSMIC-RAY MODIFIED STELLAR WINDS (ACCELERATION, MODULATION, DIFFUSION, TRANSONIC SOLUTION)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183980.

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A two fluid hydrodynamical model describing the modification of a stellar wind flow due to its interaction with galactic cosmic-rays is investigated. The two fluids consist of the thermal stellar wind gas and the galactic cosmic-rays. A polytropic one fluid model is used to describe the stellar wind gas, and the cosmic-rays modify the wind via their pressure gradient. The cosmic-rays are considered to be a hot low density gas of negligible mass flux, but with a significant pressure and energy flux compared to the thermal gas. The equations used are essentially those employed in two fluid hydro
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Scheucher, Markus [Verfasser], Heike [Akademischer Betreuer] Rauer, Dieter [Gutachter] Breitschwerdt, Thomas [Gutachter] Trautmann, and Heike [Gutachter] Rauer. "Habitability of terrestrial planets around active M-stars: the effect of stellar radiation and cosmic rays upon climate and photochemistry / Markus Scheucher ; Gutachter: Dieter Breitschwerdt, Thomas Trautmann, Heike Rauer ; Betreuer: Heike Rauer." Berlin : Technische Universität Berlin, 2021. http://d-nb.info/122496537X/34.

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Cristofari, Pierre. "Are supernova remnants the sources of galactic cosmic rays?" Paris 7, 2013. http://www.theses.fr/2013PA077294.

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Les rayons cosmiques ont été découverts il y a plus d'un siècle, mais leur origine reste inconnue. L'hypothèse la plus populaire est que les vestiges de supernova sont la source des rayons cosmiques. L'observation de plusieurs vestiges en rayons gamma, attendus comme produits de l'interaction entre les rayons cosmiques accélérés au niveau du vestige de supernova et le milieu interstellaire, est sans doute l'argument le plus fort pour soutenir cette hypothèse, mais ne constitue pas une preuve incontestable. En effet, un autre mécanisme, leptonique, peut aussi rendre compte des émissions gamma o
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Griessmeier, Jean-Mathias. "Aspects of the magnetosphere-stellar wind interaction of close-in extrasolar planets." Phd thesis, Katlenburg-Lindau Copernicus GmbH, 2006. http://www.digibib.tu-bs.de/?docid=00013336.

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Wade, Richard Peter. "A systematics for interpreting past structures with possible cosmic references in Sub-Saharan Africa." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-05052009-174557/.

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Книги з теми "Stellar cosmic rays"

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Parker, E. N. Spontaneous current sheets in magnetic fields: With applications to stellar x-rays. Oxford University Press, 1994.

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Thorsett, Stephen Erik. [X-ray emission from two nearby millisecond pulsars: Final technical report]. California Institute of Technology, 1994.

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Thorsett, Stephen Erik. [X-ray emission from two nearby millisecond pulsars: Final technical report]. California Institute of Technology, 1994.

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Thorsett, Stephen Erik. [X-ray emission from two nearby millisecond pulsars: Final technical report]. California Institute of Technology, 1994.

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5

Workshop, on Solar Activity Solar Wind Terrestrial Effects and Solar Acceleration (1990 Dagomys Russia). Co-chairs' final report of the National Academy of Sciences-Academy of Sciences of the USSR Workshop on Solar Activity, Solar Wind, Terrestrial Effects, and Solar Acceleration, October 15-20, 1990. National Aeronautics and Space Administration, 1992.

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Workshop on Solar Activity, Solar Wind, Terrestrial Effects, and Solar Acceleration (1990 Dagomys, Russia). Co-chairs' final report of the National Academy of Sciences-Academy of Sciences of the USSR Workshop on Solar Activity, Solar Wind, Terrestrial Effects, and Solar Acceleration, October 15-20, 1990. National Aeronautics and Space Administration, 1992.

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7

United States. National Aeronautics and Space Administration., ed. [Solar wind composition. National Aeronautics and Space Administration, 1995.

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[Solar wind composition: Progress report]. Goddard Space Flight Center, 1995.

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Частини книг з теми "Stellar cosmic rays"

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Castellina, Antonella, and Fiorenza Donato. "Astrophysics of Galactic Charged Cosmic Rays." In Planets, Stars and Stellar Systems. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5612-0_14.

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Bono, G., N. Matsunaga, L. Inno, E. P. Lagioia, and K. Genovali. "Stellar Populations in the Galactic Center." In Cosmic Rays in Star-Forming Environments. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-35410-6_9.

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Aharonian, F. A. "Gamma-Ray Emission of Supernova Remnants and the Origin of Galactic Cosmic Rays." In Planets, Stars and Stellar Systems. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5612-0_15.

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Minarovjech, M., V. Rušin, and M. Rybanský. "Cosmic Rays as an Indicator of Solar Activity." In The Sun as a Variable Star: Solar and Stellar Irradiance Variations. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0950-5_33.

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Biermann, Peter L., Sergej Moiseenko, Samvel Ter-Antonyan, and Ana Vasile. "Cosmic Rays from PeV to ZeV, Stellar Evolution, Supernova Physics and Gamma Ray Bursts." In The Early Universe and the Cosmic Microwave Background: Theory and Observations. Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1058-0_22.

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Dorman, Lev I. "Variables Gamma Ray Sources, 2: Interactions of Galactic Cosmic Rays with Solar and Stellar Winds." In Astrophysical Sources of High Energy Particles and Radiation. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0560-9_20.

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Vahia, M. N., R. K. Singh, and A. R. Rao. "Observational Evidence for Galactic Origin of Cosmic Rays Above 1019 eV and Reconnection on Galactic Scales." In Physics of Solar and Stellar Coronae: G.S. Vaiana Memorial Symposium. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1964-1_75.

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Dorman, Lev I. "Angle Distribution And Time Variations Of Gamma Ray Fluxes Generated By Galactic Cosmic Rays In Solar And Stellar Winds." In Plasma Astrophysics And Space Physics. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4203-8_48.

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Ramirez-Ruiz, Enrico, Neil Trentham, and Andrew W. Blain. "Lifting the Veil: γ-Ray Bursts as Beacons for Cosmic Star Formation." In New Quests in Stellar Astrophysics: The Link Between Stars and Cosmology. Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0393-3_44.

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Matthews, L., J. J. Quenby, and T. J. Sumner. "A ROSAT EUV Survey of Coronal Activity in Nearby Stars and Cosmic Ray Injection into the Interstellar Medium." In Physics of Solar and Stellar Coronae: G.S. Vaiana Memorial Symposium. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1964-1_48.

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Тези доповідей конференцій з теми "Stellar cosmic rays"

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Struminsky, Alexei. "Ultimate Spectrum of Solar/Stellar Cosmic Rays." In The 34th International Cosmic Ray Conference. Sissa Medialab, 2016. http://dx.doi.org/10.22323/1.236.0098.

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Morlino, Giovanni, Stefano Menchiari, Elena Amato, and Niccolò Bucciantini. "Contribution to Galactic cosmic rays from young stellar clusters." In 38th International Cosmic Ray Conference. Sissa Medialab, 2023. http://dx.doi.org/10.22323/1.444.0157.

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Haiman, Z. "Probing the cosmic dark age in X-rays." In X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. AIP, 2001. http://dx.doi.org/10.1063/1.1434627.

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Mohrmann, Lars, Hassan Abdalla, Felix Aharonian, et al. "The young massive stellar cluster Westerlund 1 in gamma rays as seen with H.E.S.S." In 37th International Cosmic Ray Conference. Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.395.0789.

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Dorman, Lev I. "GeV gamma rays from interaction of flare energetic particles with stellar wind matter." In The 26th international cosmic ray conference (ICRC). AIP, 2000. http://dx.doi.org/10.1063/1.1291482.

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Bednarek, Wlodek, and Piotr Banasinski. "Gamma-rays from comptonization of stellar radiation in the binary system containing PSR J2032+4127 at its periastron passage." In 35th International Cosmic Ray Conference. Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.301.0749.

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Dorman, Lev I. "Angle distribution and time variation of gamma ray flux from solar and stellar winds, 2. Generation by galactic cosmic rays." In The fourth compton symposium. AIP, 1997. http://dx.doi.org/10.1063/1.54100.

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Kieda, David, Jonathan Davis, Tugdual LeBohec, et al. "The VERITAS-Stellar Intensity Interferometry (VSII) survey of Stellar Diameters." In 37th International Cosmic Ray Conference. Sissa Medialab, 2021. http://dx.doi.org/10.22323/1.395.0803.

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Kieda, David, and Nolan Matthews. "Stellar Intensity Interferometric Capabilities of IACT Arrays." In 35th International Cosmic Ray Conference. Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.301.0828.

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Kieda, David, Stephan LeBohec, and Rylee Cardon. "Augmentation of VERITAS Telescopes for Stellar Intensity Interferometry." In 36th International Cosmic Ray Conference. Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.358.0714.

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