Results 51 to 60 of about 231,447 (368)

A radial velocity survey for post-common-envelope Wolf–Rayet central stars of planetary nebulae: first results and discovery of the close binary nucleus of NGC 5189 [PDF]

, 2015
The formation of Wolf-Rayet central stars of planetary nebulae ([WR] CSPNe) whose spectroscopic appearance mimics massive WR stars remains poorly understood. Least understood is the nature and frequency of binary companions to [WR] CSPNe that may explain
R. Manick, B. Miszalski, V. McBride
semanticscholar   +1 more source

THE CLOSE BINARY FREQUENCY OF WOLF–RAYET STARS AS A FUNCTION OF METALLICITY IN M31 AND M33 [PDF]

Proceedings of the International Astronomical Union, 2014
Massive star evolutionary models generally predict the correct ratio of WC-type and WN-type Wolf–Rayet stars at low metallicities, but underestimate the ratio at higher (solar and above) metallicities. One possible explanation for this failure is perhaps
K. Neugent, P. Massey
semanticscholar   +1 more source

The fate of close encounters between binary stars and binary supermassive black holes [PDF]

, 2017
The evolution of main sequence binaries that reside in the Galactic Centre can be heavily influenced by the central supermassive black hole (SMBH). Due to these perturbative effects, the stellar binaries in dense environments are likely to experience ...
Yihan Wang, N. Leigh, Ye-Fei Yuan, R. Perna   +3 more
semanticscholar   +1 more source

Tidally trapped pulsations in binary stars [PDF]

Monthly notices of the Royal Astronomical Society, 2020
A new class of pulsating binary stars was recently discovered, whose pulsation amplitudes are strongly modulated with orbital phase. Stars in close binaries are tidally distorted, so we examine how a star’s tidally induced asphericity affects its ...
J. Fuller, D. Kurtz, D. Kurtz, G. Handler, S. Rappaport   +4 more
semanticscholar   +1 more source

Computation of gravitational waves from inspiraling binary neutron stars in quasiequilibrium circular orbits : Formulation and calibration [PDF]

, 2001
Gravitational waves from binary neutron stars in quasiequilibrium circular orbits are computed using an approximate method which we propose in this paper. In the first step of this method, we prepare general relativistic irrotational binary neutron stars
A. G. Wiseman, A. G. Wiseman, C. M. Will, C. S. Kochanek, C. W. Misner, D. Kennefick, D. Lai, D. Lai, E. Gourgoulhon, E. Poisson, H. Asada, H. Asada, H. Tagoshi, H. Tagoshi, J. R. Wilson, J. W. York, Jr., K. S. Thorne, K. S. Thorne, K. S. Thorne, K. Uryū, K. Uryū, K. Uryū, Kōji Uryū, L. Bildsten, L. Blanchet, L. Blanchet, L. Blanchet, L. Blanchet, L. Blanchet, L. Blanchet, L. Smarr, M. D. Duez, M. Shibata, M. Shibata, M. Shibata, M. Shibata, M. Shibata, M. Shibata, Masaru Shibata, P. Laguna, P. Marronetti, P. R. Brady, R. Arnowitt, S. A. Teukolsky, S. Bonazzola, S. Bonazzola, S. Chandrasekhar, S. L. Shapiro, T. Damour, T. W. Baumgarte, W. H. Press, W. Kley, Y. Itoh, Y. Mino   +53 more
core   +2 more sources

Microlensing of close binary stars [PDF]

Monthly Notices of the Royal Astronomical Society, 2009
The gravity due to a multiple-mass system has a remarkable gravitational effect: the extreme magnification of background light sources along extended so-called caustic lines. This property has been the channel for some remarkable astrophysical discoveries over the past decade, including the detection and characterisation of extra-solar planets, the ...
openaire   +4 more sources

Identifying close binary central stars of PN with Kepler [PDF]

, 2015
Six planetary nebulae (PN) are known in the Kepler space telescope field of view, three newly identified. Of the 5 central stars of PN with useful Kepler data, one, J193110888+4324577, is a short-period, post common envelope binary exhibiting ...
O. Marco, J. Long, G. Jacoby, T. Hillwig, Matthias Kronberger, S. Howell, N. Reindl, S. Margheim   +7 more
semanticscholar   +1 more source

The Birth Function for Black Holes and Neutron Stars in Close Binaries [PDF]

Astrophysical Journal, 2020
The mass function for black holes and neutron stars at birth is explored for mass-losing helium stars. These should resemble, more closely than similar studies of single hydrogen-rich stars, the results of evolution in close binary systems.
S. Woosley, T. Sukhbold, H. Janka
semanticscholar   +1 more source

Surveying Planetary Nebulae Central Stars for Close Binaries: Constraining Evolution of Central Stars Based on Binary Parameters

Galaxies, 2018
The increase in discovered close binary central stars of planetary nebulae is leading to a sufficiently large sample to begin to make broader conclusions about the effect of close binary stars on common envelope evolution and planetary nebula formation ...
Todd Hillwig
doaj   +1 more source

Orbital Period Variations in HT Cas: Evidence for Additional Angular Momentum Loss and a High-eccentricity Giant Planet

The Astrophysical Journal, 2023
We present a timing study of the short-period eclipsing cataclysmic variable (CV) HT Cas. Based on new eclipse times derived from our photometric monitoring and archival optical data, combined with historical timings, spanning ∼42 yr, we detect a secular
Z.-T Han, S.-B Qian, Q.-W Han, L. Zang, B. Soonthornthum, L.-J Li, L.-Y. Zhu, W. Liu, E. Fernández Lajús, Z.-B Dai, W.-W Na   +10 more
doaj   +1 more source