Results 21 to 30 of about 3,851 (308)

TOI 694b and TIC 220568520b: Two Low-mass Companions near the Hydrogen-burning Mass Limit Orbiting Sun-like Stars [PDF]

, 2020
We report the discovery of TOI 694 b and TIC 220568520 b, two low-mass stellar companions in eccentric orbits around metal-rich Sun-like stars, first detected by the Transiting Exoplanet Survey Satellite (TESS).
Flowers, Erin, Winn, Joshua N., Henning, Thomas, Dos Santos, Leonardo A., Rose, Mark E., Mann, Andrew W., Zhou, George, James, Hodari-Sadiki, Nielsen, Louise, Jenkins, Jon M., Grieves, Nolan, Furesz, Gabor, Latham, David W., Wallace, Alexander, Zhan, Zhuchang, Quintana, Elisa V., Vezie, Michael, Tenenbaum, Peter, Huang, Chelsea X., Yahalomi, Daniel A., Seager, Sara, Shporer, Avi, Sarkis, Paula, Ziegler, Carl, Law, Nicholas, Butler, R. Paul, Ireland, Michael, Henry, Todd J., Stassun, Keivan G., Ricker, George R., Brahm, Rafael, Mireles, Ismael, Gunther, Maximilian N., Yu, Liang, Vanderspek, Roland, Hesse, Katharine, Smith, Jeffrey C., Jao, Wei-Chun, Rodriguez, Joseph E., Udry, Stephane, Bouchy, Francois, Jordan, Andres, Paredes, Leonardo A.   +42 more
core   +1 more source

NICER Observations of Thermonuclear Bursts from 4U 1728-34: Detection of Oscillations prior to the Onset of Two Bursts

The Astrophysical Journal, 2023
We present temporal and time-resolved spectral analyses of all the thermonuclear X-ray bursts observed from the neutron star low-mass X-ray binary 4U 1728−34 with NICER from 2017 June to 2019 September.
Z. Funda Bostancı, Tuğba Boztepe, Tolga Güver, Tod E. Strohmayer, Yuri Cavecchi, Ersin Göğüş, Diego Altamirano, Peter Bult, Deepto Chakrabarty, Sebastien Guillot, Gaurava K. Jaisawal, Christian Malacaria, Giulio C. Mancuso, Andrea Sanna, Jean H. Swank   +14 more
doaj   +1 more source

Compact Stars in low-mass X-ray binaries

, 2014
We propose a model for compact stars in low-mass X-ray binaries(LMXBs) namely KS 1731-260, EXO 1745-248 and 4U 1608-52. Here we investigate the physical phenomena of a compact star in the LMXBs. Using our model, we have calculated central density, surface density, mass(M) and red-shift for the above mentioned compact stars, which is very much ...
Hossein, Sk. Monowar, Molla, Sajahan, Jafry, Md. Abdul Kayum, Kalam, Mehedi   +3 more
openaire   +2 more sources

Accreting Neutron Stars in Low-Mass X-Ray Binary Systems [PDF]

, 2008
22 pages, 7 figures, updated list of sources and references, to appear in "Short-period Binary Stars: Observation, Analyses, and Results", eds. E.F. Milone, D.A. Leahy, and D. Hobill (Dordrecht: Springer, http://www.springerlink.com)
Lamb, Frederick K., Boutloukos, Stratos
openaire   +2 more sources

Polarization properties of weakly magnetized neutron stars in low-mass X-ray binaries

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT X-ray polarimetry missions like Imaging X-ray Polarimetry Explorer will be able to measure for the first time the polarization properties of accreting, weakly magnetized neutron stars in low-mass X-ray binaries. In this work, we present simulations of the expected X-ray polarized signal, including the coronal emission for ...
A Gnarini, F Ursini, G Matt, S Bianchi, F Capitanio, M Cocchi, R Farinelli, W Zhang   +7 more
openaire   +3 more sources

The radial velocity of the companion star in the low-mass X-ray binary 2S 0921-630 : limits on the mass of the compact object [PDF]

, 2005
In this paper we report on optical spectroscopic observations of the low-mass X-ray binary 2S 0921–630 obtained with the Very Large Telescope. We found sinusoidal radial velocity variations of the companion star with a semi-amplitude of 99.1 ± 3.1 km s−1
van der Klis, M., Nelemans, G., Steeghs, D., Nelemans, G.A., Jonker, P. G., Jonker, P.G.   +5 more
core   +1 more source

Hard X-ray colours of neutron star and black hole low mass X-ray binaries with INTEGRAL [PDF]

Advances in Space Research, 2007
Paper from poster presentation at COSPAR meeting, Beijing, 2006.
Paltani, Stéphane, Courvoisier, Thierry, Parmar, Arvind, Parmar, Arvind, Shaw, Simon, Paizis, Ada, Shaw, Simon, Mowlavi, Nami, Paltani, Stephane, Courvoisier, Thierry, Paizis, Ada, Mowlavi, Nami   +11 more
openaire   +2 more sources

Isotropic star in low-mass X-ray binaries and X-ray pulsars

, 2014
We present a model for compact stars in the low mass X-ray binaries(LMXBs) and X-ray pulsars using a metric given by John J. Matese and Patrick G. Whitman \citep{Matese and Whitman1980}. Here the field equations are reduced to a system of two algebraic equations considering the isotropic pressure.
Kalam, Mehedi, Hossein, Sk. Monowar, Molla, Sajahan   +2 more
openaire   +2 more sources

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

, 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

NEUTRON STAR MASSES AND RADII FROM QUIESCENT LOW-MASS X-RAY BINARIES [PDF]

The Astrophysical Journal, 2014
We perform a systematic analysis of neutron star radius constraints from five quiescent low-mass X-ray binaries and examine how they depend on measurements of their distances and amounts of intervening absorbing material, as well as their assumed atmospheric compositions.
Lattimer, James M., Steiner, Andrew W.
openaire   +2 more sources