Results 41 to 50 of about 1,006,206 (194)

The Combination of Spectroscopic and Astrometric Data in the Analysis of Orbital Motions in Binary Star Systems [PDF]

International Astronomical Union Colloquium, 1992
AbstractEven though various types of data for binary stars are being obtained in unprecedented quantities there is still a lack of completeness. Because the reduction of combinations of these data adds to the fundamental concepts in astronomy it is advantageous to have available a general self-consistent method whereby all the elements of the orbits of
openaire   +1 more source

Hidden Companions to Intermediate-mass Stars. XI. Uncovering a 0.7 M _⊙, 2.3 au Companion in the Astrometric Binary HIP 111200 = 58 Aquarii*

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
openaire   +1 more source

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +1 more source

Astrometrically identified nearby binary stars

, 2021
22,699 astrometric binary candidates identified via Gaia astrometry from the Gaia Catalog of Nearby Stars. Details of the specific data products and how the sample was selected can be found in Penoyre, Belokurov & Evans 2022, with a description of the ...
Zephyr Penoyre
core   +1 more source

The GALAH survey: multiple stars and our Galaxy [PDF]

, 2020
Context. Binary stellar systems form a large fraction of the Galaxy’s stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken into account when observations of stars are used to ...
Kos, J.,, Ting, Y.-S., S. Sharma, Traven, G., D'Orazi, Valentina, K. Lind, Lewis, G.,, Merle, Thibault, Church, R.,, Traven, Gregor, Simpson, Jeffrey, Sharma, Sanjib, Merle, T.,, Sharma, S.,, Simpson, J.,, Munari, U., V. D’Orazi, Lewis, G., Lin, J., Stello, Dennis, K. Čotar, Zwitter, T.,, T. Merle, R. Church, Lind, Karin,, M. Asplund, Van der Swaelmen, M.,, K. Freeman, R. A. Wittenmyer, Bland-Hawthorn, J.,, Martell, S.,, Bland-Hawthorn, Joss, C. Sahlholdt, S. Buder, Asplund, M., A. Casey, Asplund, M.,, Zucker, Danièle, Martell, S., Sahlholdt, C.,, Van Der Swaelmen, M., Buder, S.,, Casey, A.,, Buder, S., Casey, Andrew, Wittenmyer, Robert R.A., Kos, Janez, D'Orazi, V., Munari, U.,, Cotar, K., D'Orazi, V,, Cotar, K.,, Van Der Swaelmen, Mathieu, Freeman, K.,, Sahlholdt, C., Zucker, D.,, D. Stello, Feltzing, S., Buder, Sven, De Silva, Gayandhi, Y.-S. Ting, U. Munari, Freeman, Kenneth, Cotar, Klemen, S. Martell, Wittenmyer, R. A., Feltzing, Sofia, Zwitter, T., Stello, D., Casey, A., Simpson, J., De Silva, G.,, Church, Ross R.P., T. Zwitter, Munari, Ulisse, S. Feltzing, Ting, Y-S,, Lind, Karin, J. Lin, J. Kos, Asplund, Martin, G. Traven, Sahlholdt, Christian Lundsgaard C., Lin, J.,, Ting, Yuansen Y.S., Feltzing, S.,, Kos, J., G. Lewis, Freeman, K., Sharma, S., Bland-Hawthorn, J., M. Van der Swaelmen, De Silva, G., Zucker, D., Ting, Y. S., Lind, K., Ting, Y. -S., VAN DER SWAELMEN, Mathieu Benoit Jean, Merle, T., Wittenmyer, R. A.,, Church, R., J. Bland-Hawthorn, Lin, Jane, Traven, G.,, G. De Silva, Zwitter, Tomaž, J. Simpson, Stello, D.,, Martell, Sarah, D. Zucker, Lewis, Geraint   +110 more
core   +1 more source

Speckle Observations With PISCO in Calern (France): III. Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We present relative astrometric measurements of visual double stars, made in 2019 with the speckle camera PISCO at the 1‐m Epsilon telescope of the C2PU facility (Observatoire de la Côte d'Azur, Calern site). Our observing list contains orbital couples as well as double stars whose motion is still uncertain.
J.‐L. Prieur, M. Scardia, J.‐P. Rivet, E. Aristidi, J. F. Ling, L. Piccotti, L. Pansecchi, R. W. Argyle, L. Abe, P. Bendjoya, L. Maccarini, D. Vernet   +11 more
wiley   +1 more source

Revisiting Variable Stars Toward the Globular Cluster NGC 6496 With ATLAS and Gaia Photometry

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We revisit 13 variable stars in the field of the metal‐rich globular cluster NGC 6496, discovered by Abbas et al. (2015; Astronomical Journal 149:40) (hereafter referred to as “MA15”) via time‐series data, spanning 2 years. We improve upon the MA15 characterization of the variables using ATLAS time‐series photometry data, spanning 8 years, in ...
Madison E. Martin, Andrew Layden, Andrew McNeill   +2 more
wiley   +1 more source

Mining of the Milky Way Star Archive Gaia-DR2. Searching for Binary Stars in Planetary Nebulae

Proceedings, 2020
The aim of this work is to search for binary stars associated to planetary nebulae (ionized stellar envelopes in expansion), by mining the astronomical archive of Gaia DR2, that is composed by around 1.7 billion stellar sources.
Iker González-Santamaría, Minia Manteiga, Carlos Dafonte, Arturo Manchado, Ana Ulla   +4 more
doaj   +1 more source

Three-dimensional Orbit of AC Her Determined: Binary-induced Truncation Cannot Explain the Large Cavity in This Post-AGB Transition Disk

The Astrophysical Journal, 2023
Some evolved binaries, namely post–asymptotic giant branch (AGB) binaries, are surrounded by stable and massive circumbinary disks similar to protoplanetary disks found around young stars. Around 10% of these disks are transition disks: they have a large
Narsireddy Anugu, Jacques Kluska, Tyler Gardner, John D. Monnier, Hans Van Winckel, Gail H. Schaefer, Stefan Kraus, Jean-Baptiste Le Bouquin, Steve Ertel, Antoine Mérand, Robert Klement, Claire L Davies, Jacob Ennis, Aaron Labdon, Cyprien Lanthermann, Benjamin R. Setterholm, Theo ten Brummelaar, Akke Corporaal, Laurence Sabin, Jayadev Rajagopal   +19 more
doaj   +1 more source

Prediction of Astrometric and Timing Microlensing Events with Pulsars by ATNF Catalog and Gaia DR3

The Astrophysical Journal
Determining the mass of neutron stars is crucial for understanding their formation, evolution, and interior structure. Currently, only a few dozen neutron stars have had their masses measured, and most of them belong to binary systems. However, there are
Xu Lu, Yi Xie
doaj   +1 more source