Results 61 to 70 of about 1,006,206 (194)

Seismic inference of 57 stars using full-length Kepler data sets

EPJ Web of Conferences, 2017
We present stellar properties of 57 stars from a seismic inference using full-length data sets from Kepler (mass, age, radius, distances). These stars comprise active stars, planet-hosts, solar-analogs, and binary systems.
Creevey Orlagh, Metcalfe Travis S., Salabert David, Mathur Savita, Schultheis Mathias, García Rafael A., Thévenin Frédéric, Bazot Michaël, Xu Haiying   +8 more
doaj   +1 more source

Uncertainties in Historic Visual Double Star Measures—III Accurate Calibration Pairs

Astronomische Nachrichten, Volume 346, Issue 10, December 2025.
ABSTRACT Based on space‐based positions and proper motions, we present accurate rectilinear elements for 857 double star pairs over the celestial sphere. These elements allow for the computation of precision ephemeris Position Angles and Separations of these pairs.
Roderick R. Letchford, Graeme L. White
wiley   +1 more source

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

Mass Transfer in Binary Stars using Smoothed Particle Hydrodynamics [PDF]

, 2010
Despite numerous efforts to better understand binary star evolution, some aspects of it remain poorly constrained. In particular, the evolution of eccentric binaries has remained elusive mainly because the Roche lobe formalism derived for circular ...
Lajoie, Charles-Philippe
core  

Photometry of Astrometric Reference Stars

, 1991
We present, in the third in a series of papers, UBVRI, DDO, and uvby, Hβ photometry of astrometric reference stars. Spectral types and luminosity classifications made from the colors are used to determine their spectroscopic parallaxes.
Persinger, Tim, Stein, John W., Prosser, James, Castelaz, Michael W., Powell, Harry D.   +4 more
core   +1 more source

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

The Dynamic Masses of 47 Single-lined Spectroscopic Binaries: Combining Spectroscopic and Astrometric Data

The Astrophysical Journal Supplement Series
We compiled a sample of 47 single-lined spectroscopic binaries (SB1s) with available relative astrometric measurements. By combining radial velocities, relative astrometry, and absolute astrometry when available and reliable, we determine the component ...
Xiaoli Wang, Fang Xia, Yanning Fu
doaj   +1 more source

Weighing the Darkness. II. Astrometric Measurement of Partial Orbits with Gaia

The Astrophysical Journal, 2023
Over the course of several years, stars trace helical trajectories as they traverse across the sky due to the combined effects of proper motion and parallax.
Jeff J. Andrews, Katelyn Breivik, Chirag Chawla, Carl L. Rodriguez, Sourav Chatterjee   +4 more
doaj   +1 more source

Radial Velocity Orbital Solutions for Candidate Black Hole and Neutron Star Binary Systems in the Gaia Data Release 3 Catalog

The Astrophysical Journal
We present spectroscopic follow-up observations of binary systems from the Gaia Data Release 3 (DR3) binary catalog that were selected to have large enough mass functions for their companions to be black holes or neutron stars.
Joshua D. Simon, Casey Y. Lam, Kareem El-Badry, Henrique Reggiani, Sukanya Chakrabarti, Puragra Guhathakurta, Ian B. Thompson, Nidia Morrell, Daniel Huber, Benjamin J. Fulton, Lauren M. Weiss   +10 more
doaj   +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