Results 71 to 80 of about 51,217 (241)

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +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

Observation of double star by long-baseline interferometry [PDF]

, 2014
This paper serves as a reference on how to estimate the parameters of binary stars and how to combine multiple techniques, namely astrometry, interferometry and radial velocities.Comment: F. Millour, A. Chiavassa, L. Bigot, O. Chesneau, A. Meilland \& P.
Bonneau, Daniel, Meilland, Anthony, Millour, Florentin   +2 more
core   +5 more sources

Reassessing the Relationship Between Meteor Radio Afterglows and Optical Persistent Trains

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract Meteor radio afterglows (MRAs) and optical persistent trains (PTs) are two types of long‐lived phenomena which are occasionally observed following the occurrence of a meteor. Both phenomena are thought to be produced by intrinsic emission mechanisms; PTs have been associated with chemiluminescent reactions between meteoric metals and ...
L. E. Cordonnier, K. S. Obenberger, G. B. Taylor, J. M. Holmes, J. Dowell, D. Vida   +5 more
wiley   +1 more source

Compact Binary Formation in Open Star Clusters III: Probability of Binary Black Holes Hidden Inside of Gaia Black Hole Binary

The Open Journal of Astrophysics
The Gaia mission and its follow-up observations have discovered a few candidates of non-interacting single black holes (BHs) and visible stars, Gaia BH1, BH2, and BH3, collectively called "astrometric BH binaries".
Ataru Tanikawa, Long Wang, Michiko S. Fujii, Alessandro A. Trani, Toshinori Hayashi, Yasushi Suto   +5 more
doaj   +1 more source

A Noninteracting Galactic Black Hole Candidate in a Binary System with a Main-sequence Star

The Astronomical Journal, 2023
We describe the discovery of a solar neighborhood ( d = 468 pc) binary system with a main-sequence sunlike star and a massive noninteracting black hole candidate. The spectral energy distribution of the visible star is described by a single stellar model.
Sukanya Chakrabarti, Joshua D. Simon, Peter A. Craig, Henrique Reggiani, Timothy D. Brandt, Puragra Guhathakurta, Paul A. Dalba, Evan N. Kirby, Philip Chang, Daniel R. Hey, Alessandro Savino, Marla Geha, Ian B. Thompson   +12 more
doaj   +1 more source

An Astrometric Study of the Binary Star α Ophiuchi

The Astronomical Journal, 2005
The work reported here combines data from the Multichannel Astrometric Photometer (MAP), the European astrometric satellite, Hipparcos, and infrared speckle observations of the nearby subgiant binary star system α Oph. The A5 IV primary is found to have a mass of 2.84 ± 0.19 M⊙, while the approximately K2 V companion has a mass of 0.78 ± 0.058 M⊙.
openaire   +1 more source

Spin–Orbit Alignment of Early-type Astrometric Binaries and the Origin of Slow Rotators

The Astrophysical Journal
The spin–orbit alignment of binary stars traces their formation and accretion history. Previous studies of spin–orbit alignment have been limited to small samples, slowly rotating solar-type stars, and/or wide visual binaries that not surprisingly ...
Chase L. Smith, Maxwell Moe, Kaitlin M. Kratter   +2 more
doaj   +1 more source

THE LOW-MASS ASTROMETRIC BINARY LSR 1610–0040 [PDF]

, 2015
Even though it was discovered more than a decade ago, LSR 1610−0040 remains an enigma. This object has a peculiar spectrum that exhibits some features typically found in L subdwarfs, and others common in the spectra of more massive M dwarf stars.
S. Koren, C. Blake, C. Dahn, H. Harris
semanticscholar   +1 more source

Speckle Observations With PISCO in Calern (France): II. Astrometric Measurements of Visual Double Stars in 2017–2018 and New or Revised Orbits for A1913 AB, A1710, COU1394, BU1185, A122, A570, HU577, COU812, HU332, A2095 AB, and A884

Astronomische Nachrichten, Volume 346, Issue 6, July 2025.
ABSTRACT We present relative astrometric measurements of visual double stars, made in 2017–2018 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.
M. Scardia, J.‐L. Prieur, J.‐P. Rivet, D. Vernet, E. Aristidi, J. F. Ling, L. Piccotti, L. Pansecchi, R. W. Argyle, L. Abe, P. Bendjoya, L. Maccarini   +11 more
wiley   +1 more source