Related papers: First bounds on the high-energy emission from isol…

News on the X-ray emission from hot subdwarf stars

In latest years, the high sensitivity of the instruments on-board the XMM-Newton and Chandra satellites allowed us to explore the properties of the X-ray emission from hot subdwarf stars. The small but growing sample of X-ray detected hot…

High Energy Astrophysical Phenomena · Physics 2017-12-04 N. La Palombara , S. Mereghetti

Periodic Emission from the Gamma-ray Binary 1FGL J1018.6-5856

Gamma-ray binaries are stellar systems containing a neutron star or black hole with gamma-ray emission produced by an interaction between the components. These systems are rare, even though binary evolution models predict dozens in our…

High Energy Astrophysical Phenomena · Physics 2012-02-16 The Fermi LAT Collaboration , M. J. Coe , F. Di Mille , P. G. Edwards , M. D. Filipović , J. L. Payne , J. Stevens , M. A. P. Torres

Evolution of wide O star binaries through their LBV stage. Population synthesis with mass-ejection-driven orbital evolution

Context. Long-period Wolf-Rayet (WR) star binaries produced by mass transfer are predicted to be abundant, but are observationally rare. This yields constraints on the evolution of initially wide O star binaries, including those potentially…

Solar and Stellar Astrophysics · Physics 2026-03-17 Xiao-Tian Xu , Philipp Podsiadlowski , Norbert Langer , Xue-Feng Wang , Xiang-Dong Li , Alexander Heger , Jonathan Mackey , Götz Gräfener , Harim Jin

Gamma-Ray Bursts at high and very high energies

Gamma-Ray Bursts (GRBs) are extra-galactic and extremely energetic transient emissions of gamma rays, which are thought to be associated with the death of massive stars or the merger of compact objects in binary systems. Their huge…

High Energy Astrophysical Phenomena · Physics 2016-07-20 F. Piron

Gamma Rays from colliding winds in massive binaries. Status and prospects

Binary systems formed by early-type stars with strong winds are known to display variable non-thermal radio emission, thermal X-rays, and, at least in one case (Eta Carina), $\gamma$ rays. Some of these systems are quite eccentric and the…

High Energy Astrophysical Phenomena · Physics 2019-03-07 Gustavo E. Romero

Simulating three-dimensional nonthermal high-energy photon emission in colliding-wind binaries

Massive stars in binary systems have long been regarded as potential sources of high-energy gamma rays.The emission is principally thought to arise in the region where the stellar winds collide and accelerate relativistic particles which…

High Energy Astrophysical Phenomena · Physics 2015-06-19 K. Reitberger , R. Kissmann , A. Reimer , O. Reimer

First LOFAR Observations of Gamma-Ray Binaries

A few binary systems display High Energy (100 MeV - 100 GeV) and/or Very High Energy (> 100 GeV) gamma-ray emission. These systems also display non-thermal radio emission that can be resolved with long-baseline radio interferometers,…

High Energy Astrophysical Phenomena · Physics 2015-06-11 Benito Marcote , Marc Ribó , Josep M. Paredes , John Swinbank , Jess Broderick , Rob Fender , Sera Markoff , Ralf Wijers

Gamma-ray emission from pulsar/massive-star binaries

I present a review of the main phenomenological properties at high energies related to massive gamma-ray binaries and I discuss some aspects of pulsar models for these objects.

High Energy Astrophysical Phenomena · Physics 2015-05-14 Gustavo E. Romero

Variable Very High Energy Gamma-ray Emission from the Microquasar LS I +61 303

Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and laboratories for elucidating the physics of relativistic jets. Here we report the detection of variable gamma-ray…

Astrophysics · Physics 2010-01-28 MAGIC Collaboration , J. Albert

The orbit and stellar masses of the archetype colliding-wind binary WR 140

We present updated orbital elements for the Wolf-Rayet (WR) binary WR\,140 (HD\,193793; WC7pd + O5.5fc). The new orbital elements were derived using previously published measurements along with {\color{black}160} new radial velocity…

Solar and Stellar Astrophysics · Physics 2021-05-12 Joshua D. Thomas , Noel D. Richardson , J. J. Eldridge , Gail H. Schaefer , John D. Monnier , Hugues Sana , Anthony F. J. Moffat , Peredur Williams , Michael F. Corcoran , Ian R. Stevens , Gerd Weigelt , Farrah D. Zainol , Narsireddy Anugu , Jean-Baptiste Le Bouquin , Theo ten Brummelaar , Fran Campos , Andrew Couperus , Claire L. Davies , Jacob Ennis , Thomas Eversberg , Oliver Garde , Tyler Gardner , Joan Guarro Fló , Stefan Kraus , Aaron Labdon , Cyprien Lanthermann , Robin Leadbeater , T. Lester , Courtney Maki , Brendan McBride , Dogus Ozuyar , J. Ribeiro , Benjamin Setterholm , Berthold Stober , Mackenna Wood , Uwe Zurmühl

The first orbital solution for the massive colliding-wind binary HD93162 (=WR25)

Since the discovery, with the EINSTEIN satellite, of strong X-ray emission associated with HD93162 (=WR25), this object has been predicted to be a colliding-wind binary system. However, radial-velocity variations that would prove the…

Astrophysics · Physics 2020-12-09 R. Gamen , E. Gosset , N. Morrell , V. Niemela , H. Sana , Y. Naze , G. Rauw , R. Barba , G. Solivella

On the optically-thick winds of Wolf-Rayet stars

(abridged) The strong winds of Wolf-Rayet (WR) stars are important for the mechanical and chemical feedback of the most massive stars and determine whether they end their lives as neutron stars or black holes. In this work we investigate…

Solar and Stellar Astrophysics · Physics 2017-12-06 G. Gräfener , S. P. Owocki , L. Grassitelli , N. Langer

Wolf-Rayet stars: recent advances and persisting problems

Wolf-Rayet (WR) stars comprise a class of stars whose spectra are dominated by strong, broad emission lines that are associated with copious mass loss. In the massive-star regime, roughly 90% of the known WR stars are thought to have…

Solar and Stellar Astrophysics · Physics 2024-11-20 Tomer Shenar

Constraints on the intergalactic magnetic field from ${\gamma}$-ray observations of GRB 190114C

Very high energy photons from cosmological gamma-ray bursts (GRBs) are expected to interact with extragalactic background light (EBL) and produce electron-positron pairs when they propagate through intergalactic medium (IGM). These…

High Energy Astrophysical Phenomena · Physics 2020-04-08 Ze-Rui Wang , Shao-Qiang Xi , Ruo-Yu Liu , Rui Xue , Xiang-Yu Wang

MAGIC upper limits on the very high energy emission from GRBs

The fast repositioning system of the MAGIC Telescope has allowed during its first data cycle, between 2005 and the beginning of year 2006, observing nine different GRBs as possible sources of very high energy gammas. These observations were…

Astrophysics · Physics 2009-11-11 J. Albert , E. Aliu , H. Anderhub , P. Antoranz , A. Armada , C. Baixeras , J. A. Barrio , H. Bartko , D. Bastieri , J. Becker , W. Bednarek , K. Berger , C. Bigongiari , A. Biland , R. K. Bock , P. Bordas , V. Bosch-Ramon , T. Bretz , I. Britvitch , M. Camara , E. Carmona , A. Chilingarian , S. Ciprini , J. A. Coarasa , S. Commichau , J. L. Contreras , J. Cortina , M. T. Costado , V. Curtef , V. Danielyan , F. Dazzi , A. De Angelis , C. Delgado , R. de los Reyes , B. De Lotto , E. Domingo-Santamaria , D. Dorner , M. Doro , M. Errando , M. Fagiolini , D. Ferenc , E. Fernandez , R. Firpo , J. Flix , M. V. Fonseca , L. Font , M. Fuchs , N. Galante , R. Garcia-Lopez , M. Garczarczyk , M. Gaug , M. Giller , F. Goebel , D. Hakobyan , M. Hayashida , T. Hengstebeck , A. Herrero , D. Hohne , J. Hose , C. C. Hsu

The First Dynamical Mass Determination of a Nitrogen-rich Wolf-Rayet Star using a Combined Visual and Spectroscopic Orbit

We present the first visual orbit for the nitrogen-rich Wolf-Rayet binary, WR 133 (WN5o + O9I) based on observations made with the CHARA Array and the MIRC-X combiner. This orbit represents the first visual orbit for a WN star and only the…

Solar and Stellar Astrophysics · Physics 2021-02-17 Noel D. Richardson , Laura Lee , Gail Schaefer , Tomer Shenar , Andreas A. C. Sander , Grant M. Hill , Andrew G. Fullard , John D. Monnier , Narsireddy Anugu , Claire L Davies , Tyler Gardner , Cyprien Lanthermann , Stefan Kraus , Benjamin R. Setterholm

Constraints On Short, Hard Gamma-Ray Burst Beaming Angles From Gravitational Wave Observations

The first detection of a binary neutron star merger, GW170817, and an associated short gamma-ray burst confirmed that neutron star mergers are responsible for at least some of these bursts. The prompt gamma ray emission from these events is…

High Energy Astrophysical Phenomena · Physics 2018-05-11 Daniel Williams , James A. Clark , Andrew R. Williamson , Ik Siong Heng

First detection of ultra-high energy emission from gamma-ray binary LS I +61 303

We report the first detection of gamma-ray emission up to ultra-high-energy (UHE; $>$100 TeV) emission from the prototypical gamma-ray binary system LS I +61 303 using data from the Large High Altitude Air Shower Observatory (LHAASO). It is…

High Energy Astrophysical Phenomena · Physics 2026-03-12 Zhen Cao , F. Aharonian , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , J. Blunier , A. V. Bukevich , C. M. Cai , Y. Y. Cai , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , E. S. Chen , G. H. Chen , H. K. Chen , L. F. Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. B. Chen , X. J. Chen , X. P. Chen , Y. Chen , N. Cheng , Q. Y. Cheng , Y. D. Cheng , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , Y. X. Diao , A. J. Dong , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , K. J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , R. P. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , X. Y. He , Y. He , S. Hernández-Cadena , B. W. Hou , C. Hou , X. Hou , H. B. Hu , S. C. Hu , C. Huang , D. H. Huang , J. J. Huang , X. L. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , A. Inventar , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , S. Kaci , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , L. Li , R. L. Li , S. D. Li , T. Y. Li , W. L. Li , X. R. Li , Y. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , J. Liu , J. L. Liu , J. R. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , X. Liu , Y. Liu , Y. Liu , Y. N. Liu , Y. Q. Lou , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , I. O. Maliy , J. R. Mao , Z. Min , W. Mitthumsiri , Y. Mizuno , G. B. Mou , A. Neronov , K. C. Y. Ng , M. Y. Ni , L. Nie , L. J. Ou , Z. W. Ou , P. Pattarakijwanich , Z. Y. Pei , D. Y. Peng , J. C. Qi , M. Y. Qi , J. J. Qin , D. Qu , A. Raza , C. Y. Ren , D. Ruffolo , A. Sáiz , D. Savchenko , D. Semikoz , L. Shao , O. Shchegolev , Y. Z. Shen , X. D. Sheng , Z. D. Shi , F. W. Shu , H. C. Song , Yu. V. Stenkin , Y. Su , D. X. Sun , H. Sun , J. X. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , N. H. Tabasam , J. Takata , P. H. T. Tam , H. B. Tan , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , C. N. Tong , L. H. Wan , C. Wang , D. H. Wang , G. W. Wang , H. G. Wang , J. C. Wang , K. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , L. Y. Wang , R. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Z. H. Wang , Z. X. Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , S. S. Weng , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. F. Xiao , Y. L. Xin , H. D. Xing , Y. Xing , D. R. Xiong , B. N. Xu , C. Y. Xu , D. L. Xu , R. F. Xu , R. X. Xu , S. S. Xu , W. L. Xu , L. Xue , D. H. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Z. H. Yang , Z. G. Yao , X. A. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , X. T. Zeng , M. Zha , B. B. Zhang , B. T. Zhang , C. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , J. Y. Zhang , Li Zhang , P. F. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , S. Y. Zhang , W. Zhang , W. Y. Zhang , X. Zhang , X. P. Zhang , Yi Zhang , Yong Zhang , Z. P. Zhang , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , Z. H. Zhao , F. Zheng , T. C. Zheng , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo

Gamma-Ray Bursts: Astronomical Constraints

After presenting a short history of gamma-ray burst (GRB) studies, we discuss the current constraints on GRB models which follows from astronomical observations. We concentrate on the energetics of the GRBs with known redshifts and the…

Astrophysics · Physics 2007-05-23 K. A. Postnov

The gamma Velorum binary system. II. WR stellar parameters and the photon loss mechanism

In this paper we derive stellar parameters for the Wolf-Rayet star in the gamma Velorum binary system (WR11), from a detailed non-LTE model of its optical and infrared spectra. Compared to the study of Schaerer et al., the parameters of the…

Astrophysics · Physics 2007-05-23 Orsola De Marco , W. Schmutz , P. A. Crowther , D. J. Hillier , L. Dessart , A. de Koter , J. Schweickhardt