Results 11 to 20 of about 241,854 (224)
Hidden Companions to Intermediate-mass Stars. XI. Uncovering a 0.7 M ⊙, 2.3 au Companion in the Astrometric Binary HIP 111200 = 58 Aquarii* [PDF]
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
semanticscholar +3 more sources
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
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
ICCD Speckle Observations of Binary Stars. XIX. An Astrometric/Spectroscopic Survey of O Stars [PDF]
The Astronomical Journal, 1998 We present the results of a speckle interferometric survey made with the CHARA speckle camera and 4 m–class telescopes of Galactic O-type stars with V 59% have a visual or spectroscopic companion) but less so among field and especially runaway stars.
Brian D. Mason +5 more
semanticscholar +4 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
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
Astrometric and photometric observations of nearby binary stars. [PDF]
Publications of the Astronomical Society of the Pacific, 1976 Relative positions for 36 nearby binary stars, measured on plates obtained with the Lick 91-cm refractor, are presented. Photovisual magnitude differences for 27 of these are also given along with photoelectric measures for 14 pairs. A short discussion of the precision of double-star measurements with the Lick Automatic Measuring Engine is also ...
K. W. Kamper
openalex +3 more sources
Color-Induced Displacement double stars in SDSS [PDF]
Astron.Astrophys. 423 (2004) 755-760, 2004 We report the first successful application of the astrometric color-induced displacement technique (CID, the displacement of the photocenter between different bandpasses due to a varying contribution of differently colored components to the total light),
Bailey +26 more
core +2 more sources