Results 71 to 80 of about 403,855 (253)

Discovery of a New Phase-transient Cyclotron Line in A0535+26: Constraints on the Accretion Geometry

The Astrophysical Journal
In 2020 November, A0535+26 underwent one of its brightest outbursts, reaching nearly 12 Crab in X-ray flux. Observed by Insight-HXMT, NuSTAR, NICER, and AstroSat, this event provided valuable insights into Be/X-ray binaries.
Ashwin Devaraj, Biswajit Paul, Varun Bhalerao, Dipanjan Mukherjee   +3 more
doaj   +1 more source

X-Ray and UV Observations of the Contact Binary KIC 9832227

The Astronomical Journal, 2023
We investigate the X-ray and UV emission from the contact binary star KIC 9832227, which was observed with XMM-Newton for one orbital cycle. The binary is detected with an average X-ray luminosity of 3.4 × 10 ^30 erg s ^−1 .
Dirk Pandel, Lawrence A. Molnar
doaj   +1 more source

RXJ0123.4-7321, a Be/X-ray binary in the wing of the SMC

, 2013
To confirm faint Be/X-ray binary candidates from the XMM-Newton survey of the Small Magellanic Cloud, we searched for X-ray outbursts in archival ROSAT observations.
Haberl, F., Pietsch, W., Sturm, R., Udalski, A.   +3 more
core   +1 more source

Optical Constraints on an X-ray Transient Source in M31

, 2005
We have detected a transient X-ray source in the M31 bulge through a continuing monitoring campaign with the Chandra ACIS-I camera. The source was detected at R.A.=00:42:33.428 +/- 0.11'', Dec.=+41:17:03.37 +/- 0.11'' in only a single observation taken ...
Benjamin F. Williams, Frank A. Primini, Jeffrey E. McClintock, Massey P., Michael R. Garcia, Predehl P., Shahbaz T., Stephen S. Murray, Supper R., van Paradijs J.   +9 more
core   +1 more source

Insight-HXMT Views Her X-1: Probing the Dependence of the Cyclotron Line Energy on Flux and Time

The Astrophysical Journal, 2023
Recent observations of Her X-1 with NuSTAR (as well as with INTEGRAL, Swift, and Astrosat) have provided evidence that the nearly 20 yr-long decay of the cyclotron line energy since ∼1994 has ended and that a stable value has replaced the decay.
G. C. Xiao, R. Staubert, L. Ji, M. Y. Ge, Q. Z. Liu, J. L. Qu, S. Zhang, S. N. Zhang, J. Z. Yan, J. Li, Q. C. Bu, Y. L. Tuo, H. X. Liu, Z. X. Yang   +13 more
doaj   +1 more source

Discovery of SXP265, a Be/X-ray binary pulsar in the Wing of the Small Magellanic Cloud

, 2014
We identify a new candidate for a Be/X-ray binary in the XMM-Newton slew survey and archival Swift observations that is located in the transition region of the Wing of the Small Magellanic Cloud and the Magellanic Bridge.
Bartlett, E. S., Greiner, J., Haberl, F., Maggi, P., Rau, A., Sturm, R., Udalski, A., Vasilopoulos, G.   +7 more
core   +1 more source

Multiwavelength Characterization of the High-mass X-Ray Binary Population of M33

The Astrophysical Journal, 2023
We present multiwavelength characterization of 65 high-mass X-ray binary (HMXB) candidates in M33. We use the Chandra ACIS survey of M33 (ChASeM33) catalog to select hard X-ray point sources that are spatially coincident with UV-bright point-source ...
Margaret Lazzarini, Kyros Hinton, Cheyanne Shariat, Benjamin F. Williams, Kristen Garofali, Julianne J. Dalcanton, Meredith Durbin, Vallia Antoniou, Breanna Binder, Michael Eracleous, Neven Vulic, Jun Yang, Daniel Wik, Aria Gasca, Quetzalcoatl Kuauhtzin   +14 more
doaj   +1 more source

X-ray detection of the substellar twin 2MASS J11011926-7732383 AB

, 2007
2MASS J11011926-7732383 AB (hereafter 2M1101AB), located in the Cha I star forming region, is a rare wide-separation brown dwarf binary. XMM-Newton and Chandra observations of 2M1101AB have allowed us to examine the influence of physical parameters (mass,
Anders, B. Stelzer, Baraffe, Bate, Chabrier, Chabrier, Comerón, Comerón, Durney, Feigelson, Feigelson, Feigelson, Freeman, G. Micela, Getman, Grosso, Güdel, Hong, Kraft, Luhman, Luhman, Luhman, Maggio, Mohanty, Neuhäuser, Preibisch, Preibisch, Preibisch, Rieke, Robrade, Rosner, Smith, Stelzer, Stelzer, Telleschi, Vuong, Weisskopf, Whittet, Wichmann   +38 more
core   +1 more source

Short term pulse frequency fluctuations of OAO 1657-415 from RXTE observations [PDF]

, 2000
We present new X-ray observations of the high mass X-ray binary (HMXRB) pulsar OAO 1657-415, obtained during one orbital period (10.44 days) with the Rossi X-Ray Timing Explorer (RXTE).
Baykal, Altan
core   +3 more sources

A Precessing Stellar Disk Model for Superorbital Modulations of the Gamma-Ray Binary LS I+61° 303

The Astrophysical Journal
Gamma-ray binary LS I+61° 303 consists of a neutron star orbiting around a Be star with a period of P _orb ≃ 26.5 days. Apart from orbital modulations, the binary shows long-term flux variations with a superorbital period of ${P}_{\sup }\simeq 4.6\,{\rm ...
A. M. Chen, J. Takata, Y. W. Yu
doaj   +1 more source