Results 51 to 60 of about 1,006,206 (194)

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, Volume 347, Issue 6, July 2026.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

An Analysis of Metallic-line Stars with Emission Lines Based on LAMOST

The Astrophysical Journal
Am stars are chemically peculiar A-type stars with weak Ca II K and enhanced metal lines. Emission lines in Am stars are extremely rare and their origin poorly understood.
Yanting He, Haifeng Yang, Jianghui Cai, Yanpu Yin, Chenhui Shi, Meihong Su, Xujun Zhao, Yaling Xun   +7 more
doaj   +1 more source

Converting Binary Floating‐Point Numbers to Shortest Decimal Strings: An Experimental Review

Software: Practice and Experience, Volume 56, Issue 4, Page 462-478, April 2026.
ABSTRACT Background When sharing or logging numerical data, we must convert binary floating‐point numbers into their decimal string representations. For example, the number π might become 3.1415927. Engineers have perfected many algorithms for producing such accurate, short strings.
Jaël Champagne Gareau, Daniel Lemire
wiley   +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

First Coincident Radar and Optical Observations of a Meteor Radio Afterglow

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract It has been hypothesized that Meteor Radio Afterglows (MRAs) occur due to resonant transition radiation (RTR) where suprathermal electrons emit as they pass through electron density inhomogeneities in a turbulent plasma. Meteor trails are thought to produce suprathermal electrons through anion oxidation, which can be identified through meteor ...
K. S. Obenberger, J. L. Chau, J. Vierinen, D. Vida, L. E. Cordonnier, Z. Balint, M. Clahsen, E. Dao, J. Dowell, J. M. Holmes, R. F. Kelly, D. Kastinen, N. Pfeffer, K. Robinson, G. B. Taylor, J. M. Urco   +15 more
wiley   +1 more source

FM stars II: a Fourier view of pulsating binary stars - determining binary orbital parameters photometrically for highly eccentric cases [PDF]

, 2015
Continuous and precise space-based photometry has made it possible to measure the orbital frequency modulation of pulsating stars in binary systems with extremely high precision over long time spans.
Kurtz, Donald W., Murphy, Simon J., Kurtz, Donald Wayne, Murphy, S. J., Shibahashi, Hiromoto, Shibahashi, H.   +5 more
core   +1 more source

Astrometric monitoring of the binary brown dwarf DENIS-P J1228.2-1547

, 2004
We present astrometric monitoring data of the binary brown dwarf DENIS-PJ1228.2-1547. The data have been obtained with the Hubble Space Telescope over a time span of 5.5 yr, and confirm that DENIS-PJ1228.2-1547 is indeed a common proper motion, i.e ...
Delfosse, X., Brandner, W., Köhler, R., Martín, E. L., Bouy, H.   +4 more
core   +2 more sources

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

Radial Velocity Monitoring and Analysis of Gaia Astrometry of Selected Intermediate Mass Stars to Constrain Their Multiplicity Status

Astronomische Nachrichten, Volume 347, Issue 1, January 2026.
ABSTRACT We present new radial velocity measurements of 13 selected intermediate mass stars (2–6 M⊙). The measurements were performed between 29 April and 6 September 2024 at the University Observatory Jena using the échelle spectrograph FLECHAS. The radial velocity of eight stars was found to be constant during our spectroscopic monitoring, namely: 17
J. Bätz, M. Mugrauer, K.‐U. Michel, J. Reichert, A. Tschirschky, L. Pietsch, F. Edelmann, R. Neuhäuser   +7 more
wiley   +1 more source

A population of neutron star candidates in wide orbits from Gaia astrometry

The Open Journal of Astrophysics
We report discovery and spectroscopic follow-up of 21 astrometric binaries containing solar-type stars and dark companions with masses near 1.4 $M_{\odot}$.
Kareem El-Badry, Hans-Walter Rix, David W. Latham, Sahar Shahaf, Tsevi Mazeh, Allyson Bieryla, Lars A. Buchhave, René Andrae, Natsuko Yamaguchi, Howard Isaacson, Andrew W. Howard, Alessandro Savino, Ilya V. Ilyin   +12 more
doaj   +1 more source