Results 51 to 60 of about 83,767 (197)

On the Origin of Spectral Features Observed during Thermonuclear X-Ray Bursts and in the Aftermath Emission of a Long Burst from 4U 1820–30

The Astrophysical Journal
We study 15 thermonuclear X-ray bursts from 4U 1820–30 observed with the Neutron Star Interior Composition Explorer (NICER). We find evidence of a narrow emission line at 1.0 keV and three absorption lines at 1.7, 3.0, and 3.75 keV, primarily around the ...
Gaurava K. Jaisawal, Jérôme Chenevez, Tod E. Strohmayer, Hendrik Schatz, J. J. M. in ’t Zand, Tolga Güver, Diego Altamirano, Zaven Arzoumanian, Keith C. Gendreau   +8 more
doaj   +1 more source

Flux Variations and Torque Reversals of Cen X-3

The Astrophysical Journal
Cen X-3 is an archetypical X-ray pulsar with strong flux variations and alternating torque reversals, both of which are similar to those of recently discovered pulsating ultraluminous X-ray sources.
Jiren Liu
doaj   +1 more source

Isolated, Massive Supergiants near the Galactic Center

, 2005
We have carried out a pilot project to assess the feasibility of using radio, infrared, and X-ray emission to identify young, massive stars located between 1 and 25 pc from the Galactic center.
A. J. Burgasser, F. K. Baganoff, G. C. Bower, M. P. Muno, M. R. Morris, Mewe R., Predehl P., Scuderi S., Voges W., W. N. Brandt, Wegner W., Zickgraf F.-J.   +11 more
core   +1 more source

A Spectroscopic Survey of WNL Stars in the LMC: General Properties and Binary Status

, 2008
We report the results of an intense, spectroscopic survey of all 41 late-type, nitrogen-rich Wolf-Rayet (WR) stars in the Large Magellanic Cloud (LMC) observable with ground-based telescopes. This survey concludes the decade-long effort of the Montr\'eal
A. F. J. Moffat, Auer, Balucinska-Church, Bartzakos, Blaauw, Bonanos, Breysacher, Conti, Crowther, Crowther, Crowther, Crowther, Foellmi, Foellmi, Foellmi, Gamen, Guerrero, Guerrero, Hillier, Humphreys, Humphreys, Ignace, Kaastra, Kaufer, Keller, Kim, Kippenhahn, Kreyszig, Lamers, Liedahl, Lomb, Lucy, M. A. Guerrero, Maeder, Maeder, Maeder, Marchenko, Mason, Massey, Massey, Massey, Moffat, Moffat, Moffat, Moffat, Moffat, N. I. Morrell, N. St-Louis, Niemela, Nikolaev, Nota, O. Schnurr, Owocki, Paczyński, Pasquali, Prilutskii, Rauw, Rauw, Rauw, Roberts, Scargle, Schnurr, Schwarz, Schwarzenberg-Czerny, Schweickhardt, Selman, Seward, Smith, Stahl, Stahl, Udalski, Vanbeveren, Vink, Vink, Walborn, Walborn, Wellstein, Willis   +77 more
core   +2 more sources

NICER, NuSTAR, and Insight-HXMT Views to the Newly Discovered Black Hole X-Ray Binary Swift J1727.8-1613

The Astrophysical Journal Letters
Swift J1727.8–1613 is a black hole X-ray binary newly discovered in 2023. We perform spectral analysis with simultaneous Insight-HXMT, NICER, and NuSTAR observations when the source was approaching the hard intermediate state.
Jing-Qiang Peng, Shu Zhang, Qing-Cang Shui, Shuang-Nan Zhang, Ling-Da Kong, Yu-Peng Chen, Peng-Ju Wang, Long Ji, Jin-Lu Qu, Lian Tao, Ming-Yu Ge, Zhi Chang, Jian Li, Zhao-sheng Li, Zhuo-Li Yu, Zhe Yan   +15 more
doaj   +1 more source

An Overabundance of Transient X-ray Binaries within 1 pc of the Galactic Center

, 2004
During five years of Chandra observations, we have identified seven X-ray transients located within 23 pc of Sgr A*. These sources each vary in luminosity by more than a factor of 10, and have peak X-ray luminosities greater than 5e33 erg/s, which ...
A. Ghez, E. Pfahl, F. K. Baganoff, J. Lu, King A. R., Lee H. M., M. P. Muno, M. R. Morris, Verbunt F., W. N. Brandt, Wegner W.   +10 more
core   +1 more source

Quiescent thermal emission from neutron stars in low-mass X-ray binaries [PDF]

, 2015
A. Turlione, D. N. Aguilera, J.A. pons
openalex   +3 more sources

An Optical Search for New Outbursting Low Mass X-Ray Binaries

The Astrophysical Journal
Transient low-mass X-ray binaries (LMXBs) are discovered largely by X-ray and gamma-ray all-sky monitors. The X-ray outburst is also accompanied by an optical brightening, which empirically can precede the detection of X-rays.
Yuankun Wang, Eric C. Bellm, Allison Crossland, William I. Clarkson, Alessandro Mazzi, Reed Riddle, Russ R. Laher, Ben Rusholme   +7 more
doaj   +1 more source

Chandra HETG Observations of the Colliding Stellar Wind System WR 147

, 2010
We present an extended analysis of deep Chandra HETG observations of the WR+OB binary system WR 147 that was resolved into a double X-ray source (Zhekov & Park, 2010, ApJ, 709, L119). Our analysis of the profiles of strong emission lines shows that their
Allen, Arnaud, Babel, Cherepashchuk, Cohen, Contreras, Gagné, Lèpine, Morris, Myasnikov, Niemela, Oskinova, Panagia, Prilutskii, Sangwook Park, Schulz, Skinner, Skinner, Skinner, Skinner, Sokal, Svetozar A. Zhekov, ud-Doula, Williams, Wojdowski, Wright, Zhekov, Zhekov, Zhekov   +28 more
core   +1 more source

Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375

The Astrophysical Journal
EXO 2030+375 is a peculiar high-mass X-ray binary that has been exhibiting Type-I outburst activities consistently over the past decades. The phases of outburst peaks are generally stable and occur near the orbital periastron.
Run-Ting Huang, Long Ji, Jing-Zhi Yan
doaj   +1 more source