Results 71 to 80 of about 260 (145)

Evidence for an Accretion Bridge in the DX Cha Circumbinary System from VLTI/MATISSE Observations

The Astrophysical Journal
DX Cha (HD 104237) is a spectroscopic binary consisting of a Herbig A7.5Ve–A8Ve primary star and a K3-type companion. Here we report on new 3.55 μ m interferometric observations of this source with the Multi Aperture Mid-Infrared Spectroscopic Experiment
Tímea Juhász, József Varga, Péter Ábrahám, Ágnes Kóspál, Foteini Lykou, Lei Chen, Attila Moór, Fernando Cruz-Sáenz de Miera, Bruno Lopez, Alexis Matter, Roy van Boekel, Michiel Hogerheijde, Margaux Abello, Jean-Charles Augereau, Paul Boley, William C. Danchi, Thomas Henning, Mathis Letessier, Jie Ma, Philippe Priolet, Marten Scheuck, Gerd Weigelt, Sebastian Wolf   +22 more
doaj   +1 more source

Which is the most eccentric binary known? Insights from the 2023/4 pericenter passages of Zeta Boötis and Eta Ophiuchi

The Open Journal of Astrophysics
There is a clear dearth of very eccentric binaries among those for which individual eccentricities can be measured. In this paper we report on observations of the two nearby, bright and very eccentric visual binaries Zeta Bo\"otis ($\zeta$ Boo) and Eta ...
Idel Waisberg, Ygal Klein, Boaz Katz
doaj   +1 more source

The Triple System V1371 Tau: An Eclipsing Binary with an Outer Be Star

The Astrophysical Journal
Although triple systems are common, their orbital dynamics and stellar evolution remain poorly understood. We investigated the V1371 Tau system using TESS photometry, multiepoch spectroscopy, and recent interferometric data, confirming it as a rare ...
Danilo F. Rocha, Marcelo Emilio, Jonathan Labadie-Bartz, Coralie Neiner, Julia Bodensteiner, Tomer Shenar, Laerte Andrade, Michael Abdul-Masih, Felipe Navarete, Alessandro Melo, Eduardo Janot-Pacheco, Romualdo Eleutério, Alan W. Pereira   +12 more
doaj   +1 more source

ANAorb: A robust framework for the optimal modelling of binaries

Astronomy & Astrophysics
Context. Reliable orbital solutions for binary stars are essential for deriving accurate stellar parameters and for testing stellar-evolution models. However, current fitting approaches often struggle with local minima, strong parameter correlations, and
Andrade Manuel
doaj   +1 more source

δ Circini: A massive hierarchical triple system with an eclipsing binary

Astronomy & Astrophysics
δ Circini is known to be a massive multiple system containing a 3.9 d inner eclipsing binary in a slightly elliptical orbit exhibiting slow apsidal motion and a distant tertiary with a probable period of 1644 d.
Švrčková J., Harmanec P., Klement R., Rivinius Th., Barlow B. N., Juryšek J., Mašek M., Hoňková K., Oplištilová A.   +8 more
doaj   +1 more source

Time-lapse Very Long Baseline Interferometry Imaging of the Close Active Binary HR 1099

The Astrophysical Journal
We report multiepoch astrometric very long baseline interferometry observations of the chromospherically active binary HR 1099 (V711 Tau, HD 22468) at six epochs over 63 days using the Very Long Baseline Array at 22.2 GHz.
Walter W. Golay, Robert L. Mutel, Evan E. Abbuhl   +2 more
doaj   +1 more source

Southern Massive Stars at High Angular Resolution (SMaSH+): Properties of hierarchical massive triples★

Astronomy & Astrophysics
Context. While massive stars are frequently found in triple architectures, the lack of observed parameter distributions has long remained a bottleneck for statistical models of their evolution. Aims.
Bordier E., Sana H., Frost A. J., Libert A.-S., Vrancken J., Mahy L., Toonen S., Tramper F., de Koter A., Lacour S., Le Bouquin J.-B., de Wit W.-J.   +11 more
doaj   +1 more source

Spatial and spectral constraints on resolved mass loss of the massive post-red supergiant star IRAS 17163–3907 and its Fried Egg Nebula

Astronomy & Astrophysics
Context. The fate of massive stars during the latest stages of their evolution is highly dependent on their mass-loss rate and geometry. The geometry of the mass-loss process can be inferred from the shape of the circumstellar material, which has a ...
Koumpia E., Cikota A., de Wit W.-J., Muñoz-Sanchez G., Kim T., Corporaal A., Oudmaijer R. D., Muller S., Vink J. S., Cerrigone L., Zijlstra A., Szczerba R., Asaki Y., Lagadec E., Millour F.   +14 more
doaj   +1 more source

Chemical Fingerprints of M Dwarfs: High-resolution Spectroscopy on 31 M Dwarfs with SPIRou

The Astrophysical Journal
We extend the methodology introduced by F. Jahandar et al. to determine the effective temperature and chemical abundances of 31 slowly rotating solar neighborhood M dwarfs (M1–M5) using high-resolution spectra from CFHT/SPIRou.
Farbod Jahandar, René Doyon, Étienne Artigau, Neil J. Cook, Charles Cadieux, Jean-François Donati, Nicolas B. Cowan, Ryan Cloutier, Stefan Pelletier, Alan Alves-Brito, Jorge H. C. Martins, Hsien Shang, Andrés Carmona   +12 more
doaj   +1 more source

Optical quantum super-resolution imaging and hypothesis testing. [PDF]

Nat Commun, 2022
Zanforlin U, Lupo C, Connolly PWR, Kok P, Buller GS, Huang Z.   +5 more
europepmc   +1 more source