Results 91 to 100 of about 51,217 (241)

Uncertainties in Ground‐Based Visual Double Star Measures

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT Stellar masses are found from the orbital elements of binary systems which are, in turn, computed from weighted astrometric measures. Astrometric measures of double stars (their position angle and separation) rarely include uncertainties, and published binary star orbits rarely include the weighting systems used in the determination of the ...
Roderick R. Letchford, Graeme L. White
wiley   +1 more source

Revisit of 77 Clusters Candidates with Multiple Main Sequences using Gaia DR3

The Astronomical Journal
Gaia DR3 data provide the latest and full astrometric data for more than 1.5 billion sources, and these allow us to revisit the 77 special open cluster candidates collected from LISC star cluster catalog.
Jing Chen, Zhongmu Li, Su Zhang, Wenchang Zhao, You Wu   +4 more
doaj   +1 more source

Weighing the Darkness. III. How Gaia Could, but Probably Will Not, Astrometrically Detect Free-floating Black Holes

The Astrophysical Journal, 2023
The gravitational pull of an unseen companion to a luminous star is well known to cause deviations to the parallax and proper motion of a star. In a previous paper in this series, we argue that the astrometric mission Gaia can identify long-period ...
Jeff J. Andrews
doaj   +1 more source

Astrometry with the Hubble Space Telescope: Trigonometric Parallaxes of Selected Hyads

, 2011
We present absolute parallaxes and proper motions for seven members of the Hyades open cluster, pre-selected to lie in the core of the cluster. Our data come from archival astrometric data from FGS 3, and newer data for 3 Hyads from FGS 1R, both white ...
An, Barbara E. McArthur, Barnes, Bean, Bender, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Benedict, Cox, G. Fritz Benedict, Gatewood, Hanson, Harrison, Harrison, Johns-Krull, Joner, Lindegren, Martioli, McArthur, McArthur, McArthur, McArthur, McArthur, Morris, Narayanan, Narayanan, Nelan, Perryman, Perryman, Roelofs, Roeser, Soderblom, Standish, Taylor, Thomas E. Harrison, Torres, Torres, Torres, Turner, van Altena, van Altena, van Altena, van de Kamp, van Leeuwen, William van Altena, Zacharias   +55 more
core   +1 more source

JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT We combine infrared (IR) observations collected by the James Webb Space Telescope with optical deep images by the Hubble Space Telescope taken ~20 years earlier to compute proper‐motion membership for the globular cluster (GC) M4 (NGC 6121) along its entire white dwarf (WD) cooling sequence (CS).
Luigi R. Bedin, Mattia Libralato, Maurizio Salaris, Domenico Nardiello, Michele Scalco, Massimo Griggio, Jay Anderson, Pierre Bergeron, Andrea Bellini, Roman Gerasimov, Adam J. Burgasser, Daniel Apai   +11 more
wiley   +1 more source

Symbiotic star candidates in Gaia Data Release 3

The Open Journal of Astrophysics
Symbiotic stars, binary pairs with a cool giant fueling accretion onto a hot compact companion, offer unique insights to our understanding of stellar evolution. Yet, only a few hundred symbiotic stars are confirmed.
Samantha E. Ball, Benjamin C Bromley, Scott J. Kenyon   +2 more
doaj   +1 more source

Revisiting Variable Stars Near Globular Clusters South of −29° Declination

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT We review an often‐cited but seldom‐accessed catalogue by Fourcade and Laborde (1966) of 785 variable stars near 47 southern Galactic globular clusters, and recover the locations of 85 stars that were not incorporated into subsequent variable star catalogues and hence have become “lost” to the literature.
Andrew C. Layden, Julia Evangelista, Sakshi Gupta, Mithilesh Mittameda, Eva Mulloy, Sohan I. Muslim, Tiyinoluwa Olushola‐Alao, Akul Rishi   +7 more
wiley   +1 more source

The Algol triple system spatially resolved at optical wavelengths

, 2010
Interacting binaries typically have separations in the milli-arcsecond regime and hence it has been challenging to resolve them at any wavelength. However, recent advances in optical interferometry have improved our ability to discern the components in ...
Armstrong, Buscher, Csizmadia, ESA, Evans, Hartkopf, Heintz, Hill, Hummel, Kovalevsky, Labeyrie, Lindegren, Prieur, Prieur, Shepherd, Shepherd, Söderhjelm, van Moorsel   +17 more
core   +1 more source

Modeling Multi-Wavelength Stellar Astrometry. I. SIM Lite Observations of Interacting Binaries [PDF]

, 2010
Interacting binaries consist of a secondary star which fills or is very close to filling its Roche lobe, resulting in accretion onto the primary star, which is often, but not always, a compact object.
Barbara E. McArthur, Bell, Benedict, Benedict, Cacciari, Coughlin, D. W. Hoard, David R. Ciardi, Dawn M. Gelino, Friedjung, G. Fritz Benedict, Gelino, Gelino, Gelino, Harrison, Harrison, Harrison, Hauschildt, Herrero, Hoard, Howell, Howell, Jeffrey L. Coughlin, López-Morales, Mignard, NASA, Orosz, Plummer, Robinson, Steeghs, Stefanie Wachter, Steve B. Howell, Szkody, ten Brummelaar, Thomas E. Harrison, van Belle, Vrtilek   +36 more
core   +2 more sources

Joint astrometric solution of Hipparcos and Gaia: A recipe for the Hundred Thousand Proper Motions project [PDF]

, 2014
The first release of astrometric data from Gaia is expected in 2016. It will contain the mean stellar positions and magnitudes from the first year of observations.
Anderson, Bombrun, Daniel Michalik, David Hobbs, de Bruijne, Dehnen, Dravins, Eichhorn, Feissel, Hatsutori, Holl, Høg, Lennart Lindegren, Lindegren, Risquez, Schlesinger, Uwe Lammers, van de Kamp, van Leeuwen, Wilson   +19 more
core   +1 more source