Results 51 to 60 of about 14,620 (167)
The stellar activity-rotation-age relationship under the lens of asteroseismology
Astronomy & AstrophysicsContext. In low-mass stars, the connection between magnetic activity, rotation period, and age provides key insights into the functioning of dynamos.
Pezzotti C. +8 more
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Detection of Multiple X-Ray Quasi-periodic Oscillations in IGR J19294+1816 with Insight-HXMT
The Astrophysical JournalWe report the timing results with Insight-HXMT observations of X-ray binary IGR J19294+1816 during its 2019 type I outburst at the decline phase shortly following its peak.
Wen Yang, Wei Wang
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The Astrophysical JournalWe present the results of multiwavelength observations of the high-mass gamma-ray binary (HMGB) 4FGL J1405.1−6119. A pair of joint XMM-Newton and NuSTAR observations taken in 2019 (sampling the gamma-ray maximum and X-ray maximum) characterize the ...
Alexander Lange +6 more
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Investigating the Ultracompact X-Ray Binary Candidate SLX 1735-269 with NICER and NuSTAR
The Astrophysical JournalWe present two simultaneous NICER and NuSTAR observations of the ultracompact X-ray binary (UCXB) candidate SLX 1735−269 while the source was in two different spectral states. Using various reflection modeling techniques, we find that xillverCO , a model
D. L. Moutard +10 more
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The Evolution of X‐Ray Emission in Young Stars
The Astrophysical Journal Supplement Series, 2005 We study the relation between age and magnetic activity in late-type pre-main sequence (PMS) stars, for the first time using mass-stratified subsamples. The effort is based on the Chandra Orion Ultradeep Project (COUP) which provides very sensitive and homogenous X-ray data on a uniquely large sample of 481 optically well-characterized low-extinction ...
Preibisch, Thomas, Feigelson, Eric D.
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A Solution to the Tension of Burning on Neutron Stars and Nuclear Physics
The Astrophysical JournalWhen neutron stars accrete matter from a companion star, this matter forms a disk around them and eventually falls on their surface. Here, the fuel can ignite into bright flashes called Type I bursts.
Y. Cavecchi +10 more
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The Astrophysical JournalBased on Insight-HXMT observations, we present a detailed timing analysis and spectral evolution of a complete main high state for Her X-1 in 2020 February. We determine an accurate local ephemeris using the Rmer delay measured from five eclipses.
Wen Yang, Wei Wang, Qianhan Zhou
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X-ray Emission from O Stars [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractYoung O stars are strong, hard, and variable X-ray sources; properties that strongly affect their circumstellar and galactic environments. After ≈ 1 Myr, these stars settle down to become steady sources of soft X-rays. I will use high-resolution X-ray spectroscopy and MHD modeling to show that young O stars like θ1 Ori C are well explained by ...
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X-Ray Polarimetry of the Dipping Accreting Neutron Star 4U 1624–49
The Astrophysical JournalWe present the first X-ray polarimetric study of the dipping accreting neutron star 4U 1624−49 with the Imaging X-ray Polarimetry Explorer. We report a detection of polarization in the nondip time intervals with a confidence level of 99.99%.
M. Lynne Saade +100 more
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The Astrophysical JournalWe perform a comprehensive study of thermonuclear bursts from the neutron star low-mass X-ray binary 4U 1702–429 detected with NICER and XMM-Newton. The thermonuclear burst detected with NICER shows clear evidence of a photospheric radius expansion (PRE)
Manoj Mandal +2 more
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