Results 11 to 20 of about 1,008,045 (157)

FM stars II: a Fourier view of pulsating binary stars - determining binary orbital parameters photometrically for highly eccentric cases [PDF]

open access: yes, 2015
Continuous and precise space-based photometry has made it possible to measure the orbital frequency modulation of pulsating stars in binary systems with extremely high precision over long time spans.
Kurtz, Donald W.   +5 more
core   +1 more source

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

open access: yesGalaxies, 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

Nucleosynthesis of Binary-stripped Stars

open access: yesThe Astrophysical Journal, 2023
The cosmic origin of the elements, the fundamental chemical building blocks of the universe, is still uncertain. Binary interactions play a key role in the evolution of many massive stars, yet their impact on chemical yields is poorly understood.
R. Farmer   +4 more
doaj   +1 more source

Radial-velocity measurements of subdwarf B stars [PDF]

open access: yes, 2011
Subdwarf B (sdB) stars are hot, subluminous stars which are thought to be core-helium burning with thin hydrogen envelopes. The mechanism by which these stars lose their envelopes has been controversial, but it has been argued that binary star ...
Copperwheat, CM   +14 more
core   +1 more source

Widely separated binary systems of very low-mass stars

open access: yes, 2005
In this paper we review some recent detections of wide binary brown dwarf systems and discuss them in the context of the multiplicity properties of very low-mass stars and brown ...
Phan-Bao, N., Reylé, C., Martín, E. L.
core   +2 more sources

Mass Ratio of Single-line Spectroscopic Binaries with Visual Orbits Using Bayesian Inference and Suitable Priors

open access: yesThe Astronomical Journal, 2023
We present orbital elements for 22 single-line binaries, nine of them studied for the first time, determined from a joint spectroscopic and astrometric solution.
Jennifer Anguita-Aguero   +6 more
doaj   +1 more source

Spectroscopic Orbits of Subsystems in Multiple Stars. IX

open access: yesThe Astronomical Journal, 2023
New spectroscopic orbits of inner subsystems in 14 hierarchies are determined from long-term monitoring with the optical echelle spectrometer, CHIRON.
Andrei Tokovinin
doaj   +1 more source

CW Cas: A Solar-type Contact Binary System with an Unseen Third Companion in a Hierarchical Quadruple System

open access: yesThe Astrophysical Journal
We present a comprehensive multiband photometric and spectroscopic study of the G-type binary CW Cas. Analysis of its double-lined spectroscopic radial velocity curves yields a reliable mass ratio of q  = 1.88(9).
Azizbek Matekov   +13 more
doaj   +1 more source

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

open access: yes, 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   +3 more
core   +1 more source

Binary Star Orbits. VI. The Interferometric-spectroscopic Binary 73 Leo

open access: yesThe Astronomical Journal
Discordances in radial-velocity measurements of 73 Leonis, made more than a century ago, gave rise to the first suggestion that this fifth-magnitude star was a binary system, but it was 40 yr before an accurate investigation of the object commenced, and ...
Brian D. Mason   +9 more
doaj   +1 more source

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