Results 11 to 20 of about 51,217 (241)
Research Notes of the AAS, 2023 Abstract There are many Hipparcos/Gaia astrometric binaries for which the nature of the companion is not known. Optical/near-infrared inteferometry is arguably the most efficient method to unambiguously identify such companions. Here we report on a VLTI/GRAVITY observation in which we detected a companion to the nearby astrometric binary
Idel Waisberg, Ygal Klein, Boaz Katz
semanticscholar +3 more sources
Visual Binary Stars with Partially Missing Data: Introducing Multiple Imputation in Astrometric Analysis [PDF]
Publications of the Astronomical Society of the Pacific, 2019 Nine figures, six tables, 23 pages including three appendices. Accepted for publication in PASP.
Ruben M. Claveria +3 more
semanticscholar +6 more sources
The nearby astrometric-spectroscopic binary star Hip 68682
Frontiers in Astronomy and Space Sciences, 2023 The nearby astrometric-spectroscopic binary star Hip 68682 has an orbital period of ∼ 9.88 yr. The dynamical state (component masses and kinematic parameters) of this system is redetermined by fitting all the observational data available to us, including
Fang Xia +4 more
doaj +3 more sources
Hidden Companions to Intermediate-mass Stars. XIX. Spin–Orbit Misalignment and a 0.26M ⊙, 1.8 au Companion in the Astrometric Binary Gamma Trianguli Australis* [PDF]
Research Notes of the AASAbstract Gamma Trianguli Australis is a nearby A-type star that was reported to be a 488 days astrometric binary in Gaia DR3. Here we report on a VLTI/GRAVITY observation of γ TrA in which we did not detect the companion down to a K band flux ratio of 0.5%. From the isochrone mass M A
Idel Waisberg, Ygal Klein, Boaz Katz
semanticscholar +3 more sources
Research Notes of the AASAbstract Observations have concluded that exoplanet hosting binary stars appear to have wider mean separations than a definitive sample of “field binaries” as well as an apparent deficit of very close pairs. Many exoplanets orbit near their host stars equatorial plane, especially for close-in, small planets.
Steve B. Howell
semanticscholar +3 more sources
Research Notes of the AASAbstract Lambda Muscae is a nearby A-type star reported as a P = 474 days astrometric binary in Gaia DR3 (and previously in Hipparcos) and which also has a 0.16M ⊙ M dwarf companion at a projected separation 6.4 au discovered by VLT/SPHERE.
Idel Waisberg, Ygal Klein, Boaz Katz
semanticscholar +3 more sources
Astrometric and photometric measurements of binary stars with adaptive optics: observations from 2002 [PDF]
Monthly Notices of the Royal Astronomical Society, 2011 The adaptive optics system at the 3.6-m AEOS telescope was used to measure the astrometry and differential magnitude in I band of 56 binary stars in 2002.
Lewis C. Roberts
semanticscholar +4 more sources
Astronomy & Astrophysics, 2023 Context.TheGaiaEarly Data Release 3 contained the positions, parallaxes, and proper motions of 1.5 billion sources, some of which did not show a good fit to the ‘single star’ model. Binarity is one of the causes of this.Aims.Four million of these stars were selected and various models were tested to detect binary stars and to derive their parameters ...
Jean-Louis Halbwachs +8 more
openaire +4 more sources
Research Notes of the AAS, 2023 Abstract We report on the direct VLTI/GRAVITY interferometric detection of a close companion in the nearby Hipparcos astrometric binary 58 Aquarii with a K band flux ratio of 5.0% at a projected separation 32 mas ↔ 2.3 au. Through isochrone fitting we find that the primary is a 1.4 Gyr old, 1.68 M ⊙ late A-type star and
Idel Waisberg, Ygal Klein, Boaz Katz
openalex +2 more sources
Astrometric confirmation of young low-mass binaries and multiple systems in the Chamaeleon star-forming regions [PDF]
Astronomy & Astrophysics, 2012 The star-forming regions in Chamaeleon are one of the nearest (distance ~165 pc) and youngest (age ~2 Myrs) conglomerates of recently formed stars and the ideal target for population studies of star formation.
A. Bedalov +77 more
core +2 more sources