Results 21 to 30 of about 7,299,193 (301)

The origin of the hard X-ray tail in neutron-star X-ray binaries [PDF]

Astronomy & Astrophysics, 2016
Neutron star X-ray binaries emit a compact, optically thick, relativistic radio jet during low-luminosity, usually hard states, as Galactic black-hole X-ray binaries do. When radio emission is bright, a hard power-law tail without evidence for an exponential cutoff is observed in most systems.
Reig, P., Kylafis, N.
openaire   +2 more sources

Probing the composition of sub-millisecond rotating compact stars by r-modes instability [PDF]

, 2012
We investigate the implications of the r-modes instability on the composition of a compact star rotating at a sub-millisecond period. In particular, the only viable astrophysical scenario for such an object, wich might present inside the Low Mass X-ray ...
Giuseppe Pagliara, Drago, Alessandro, Alessandro Drago, Pagliara, Giuseppe   +3 more
core   +1 more source

On X‐Ray Variability in Active Binary Stars

The Astrophysical Journal, 1999
We compare the count-rates of active binaries observed by Einstein and ROSAT. We find significant evidence for short-term variability (approx 0.32) and marginal evidence for a larger variability at longer timescales (approx 0.38). Modeling this excess as cyclic variability, we place an upper limit on the relative amplitude of the cyclic component ...
Kashyap, Vinay, Drake, Jeremy
openaire   +2 more sources

XMM-Newton X-ray study of early type stars in the Carina OB1 association [PDF]

, 2007
<p><b>Aims:</b> X-ray properties of the stellar population in the Carina OB1 association are examined with special emphasis on early-type stars.
I. I. Antokhin, J. C. Brown, Rauw, G., G. Rauw, J.-M. Vreux, Antokhin, I. I., Antokhin, I.I., Brown, J.C., van der Hucht, K.A., Rauw, Grégor, K. A. van der Hucht, Vreux, Jean-Marie, Vreux, J.M., van der Hucht, K. A., Brown, J. C.   +14 more
core   +1 more source

Be stars in X-ray binary systems [PDF]

International Astronomical Union Colloquium, 2000
AbstractThis paper will review the status of our observations and understanding of Be stars in X-ray binary systems. In virtually all cases the binary partner to the Be star is a neutron star. The circumstellar disk provides the accretion fuel and hence stimulates the X-ray emission, whilst the neutron star provides a valuable probe of the environment ...
openaire   +2 more sources

X-Raying the Birth of Binary Neutron Stars and Neutron Star–Black Hole Binaries

The Astrophysical Journal, 2022
Abstract We consider fallback accretion after an ultrastripped supernova (USSN) that accompanies formation of a binary neutron star (BNS) or a neutron star–black hole binary (NS–BH). The fallback matter initially accretes directly to the nascent NS, while it starts to accrete to the circumbinary disk, typically 0.1–1 day after the onset ...
Kazumi Kashiyama, Ryo Sawada, Yudai Suwa
openaire   +2 more sources

The magnetosphere of the close accreting PMS binary V4046 Sgr [PDF]

, 2014
SGG acknowledges support from the Science & Technology Facilities Council (STFC) via an Ernest Rutherford Fellowship [ST/J003255/1]. GAW is supported by a Discovery Grant from the Natural Science & Engineering Research Council of Canada (NSERC).V4046 ...
Damiani, F., V. R. Holzwarth, Audard, M., Audard, M, Güdel, M, J.-F. Donati, Gregory, S. G.; id_orcid, S. H. P. Alencar, D. P. Huenemoerder, Wade, G. A., Huenemoerder, D. P, Sacco, G. G, Holzwarth, V.R., Wade, G.A., Argiroffi C., Maggio, A, Kastner, J.H., C. Argiroffi, Kastner J. H., Hussain, G. A. J, Bouvier, J, M. Audard, Alencar, S. H. P, Sacco, G. G., Huenemoerder, D.P., Holzwarth V. R., Huenemoerder D. P., Gregory, S.G., Hussain, G. A. J., Maggio, A., Damiani F., A. Maggio, ARGIROFFI, Costanza, Donati, J.-F., Damiani, F, Audard, Marc, F. Damiani, Sacco G. G., Hussain, G.A.J., Alecian, E., Sacco, G.G., Montmerle, T, Donati J.-F., Alencar S. H. P., Güdel, M., Argiroffi, C., Kastner, J. H., Alecian, E, Alencar, S.H.P., Gregory, S. G, Gregory, S. G., Montmerle T., G. A. J. Hussain, Donati, J. -F., Alencar, S. H. P., Audard M., E. Alecian, Kastner, J. H, T. Montmerle, Montmerle T, J. Bouvier, Wade G. A., Donati, J. F, J. H. Kastner, G. G. Sacco, Holzwarth, V. R., Bouvier, J., Alecian E., M. Güdel, Bouvier J., Gregory S. G., G. A. Wade, Güdel M., Montmerle, T., Huenemoerder, D. P., Maggio A., Holzwarth, V. R, S. G. Gregory, Hussain G. A. J.   +78 more
core   +1 more source

Accretion Onto the Neutron Star in Be/X-ray Binaries [PDF]

Symposium - International Astronomical Union, 2004
We study accretion onto the neutron star in Be/X-ray binaries, using a 3D SPH code and the data imported from a high resolution simulation by Okazaki et al. (2002) for a coplanar system with a short period (Porb = 24.3 d) and moderate eccentricity (e = 0.34).
Hayasaki, Kimitake, Okazaki, Atsuo. T.
openaire   +2 more sources

Bowen Fluorescence from Companion Stars in X-Ray Binaries [PDF]

International Astronomical Union Colloquium, 2004
AbstractThis paper will review a new technique of detecting companion stars in LMXBs and X-ray transients in outburst using the Bowen fluorescence NIII lines at 4634-4640. These lines are very efficiently reprocessed in the atmospheres of the companion stars and, thereby, provide estimates of the K2 velocities and mass functions.
Casares, J, Steeghs, D, Hynes, R, Charles, P, Cornelisse, R, O'Brien, K   +5 more
openaire   +3 more sources

New periodic variable stars coincident with ROSAT sources discovered using SuperWASP [PDF]

, 2007
We present optical lightcurves of 428 periodic variable stars coincident with ROSAT X-ray sources, detected using the first run of the SuperWASP photometric survey. Only 68 of these were previously recognised as periodic variables.
West, Richard G., Pollacco, Don, M. Gallaway, Street, R. A., Horne, K. (Keith), Kane, S. R., Christian, Damian Joseph, D. J. Christian (7603835), Hellier, Coel, Enoch, B., Nicholas, J. P., D. Pollacco (7603205), Irwin, J., Skillen, I., B. Enoch (7603838), West, R. G., R. A. Street, D. J. Christian, T. A. Lister (7603856), Irwin, Jonathan, K. Horne, Ryans, R., C. A. Haswell, D. M. Wilson (2428792), Wilson, D. M., Christian, D. J., J. P. Nicholas (7614728), S. R. Kane (7603853), S. R. Kane, Haswell, C. A., J. P. Nicholas, B. Enoch, C. Hellier (7603562), Norton, A. J., W. I. Clarkson, R. G. West, Lister, T. A., W. I. Clarkson (7612619), West, R .G., J. Irwin, Gallaway, M., T. A. Lister, Collier Cameron A (7614731), Pollacco, D., Parley, N., K. Horne (7603850), R. Ryans, C. A. Haswell (7603844), P. J. Wheatley (7590065), Hellier, C., Norton, Andrew J., R. Ryans (7612838), N. Parley, D. M. Wilson, Parley, N. R., I. Skillen (7601975), A. J. Norton (7603859), Horne, Keith Douglas, Horne, K. D., I. Skillen, R. G. West (7602272), A. Collier Cameron, J. Irwin (7606340), P. J. Wheatley, C. Hellier, R. A. Street (7603868), M. Gallaway (7614725), N. Parley (7603862), Cameron, Andrew Collier, Collier Cameron, A., Clarkson, W. I., Kane, Sharad R., Wheatley, P. J., A. J. Norton, Wilson, D. M. (David M.), D. Pollacco, Cameron, Andrew Collier; id_orcid   +76 more
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