Results 81 to 90 of about 51,217 (241)

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

Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey: I The Pleiades [PDF]

, 2012
We present the results of a deep wide-field near-infrared survey of the entire Pleiades cluster recently released as part of the UKIRT Infrared Deep Sky (UKIDSS) Galactic Clusters Survey (GCS) Data Release 9 (DR9).
Adams, Andersen, Artyukhina, Baker, Baraffe, Barrado y Navascués, Barrado y Navascués, Barrado y Navascués, Basri, Basri, Bastian, Bate, Bate, Bihain, Bihain, Boudreault, Bouvier, Bouy, Briceño, Burgasser, Burningham, Béjar, Casali, Casewell, Casewell, Casewell, Chabrier, Chabrier, Chabrier, Cutri, Deacon, Dobbie, Festin, Gatewood, Hambly, Hambly, Hambly, Hambly, Haro, Hertzsprung, Hewett, Hillenbrand, Hodgkin, Irwin, Jameson, Jameson, Johnson, Jones, Jones, Kirkpatrick, Kraus, Kroupa, Krumholz, Lawrence, Lodieu, Lodieu, Lodieu, Lodieu, Lodieu, Lodieu, Lucas, Luhman, Luhman, Luhman, Luhman, Luhman, Martín, Martín, Martín, Martín, Maxted, Mermilliod, Metchev, Miller, Moraux, Moraux, Muench, N. C. Hambly, N. Lodieu, N. R. Deacon, Offner, O’dell, Pinfield, Pinfield, Rebolo, Reylé, Robichon, Salpeter, Scalo, Skrutskie, Southworth, Stauffer, Stauffer, Stauffer, Stauffer, Stauffer, Tej, Trumpler, Urban, van Leeuwen, van Leeuwen, Zapatero Osorio, Zapatero Osorio, Zapatero Osorio   +103 more
core   +3 more sources

Uncertainties in Ground‐Based Visual Double Star Measures—II Accuracy of Measures

Astronomische Nachrichten, Volume 346, Issue 6, July 2025.
ABSTRACT Letchford and White 2025, Paper I, determined the uncertainties in ground‐based historic measures of double stars. In this paper, the accuracy of 26,205 ground‐based measures of 857 visual double stars, made since ∼$$ \sim $$1780, is determined relative to space‐based measures based on positions and proper motion from the HIPPARCOS (via ASCC ...
Graeme L. White, Roderick R. Letchford
wiley   +1 more source

Angular Radii of Stars via Microlensing

, 2002
We outline a method by which the angular radii of giant and main sequence stars in the Galactic bulge can be measured to a few percent accuracy. The method combines ground-based photometry of caustic-crossing bulge microlensing events, with a handful of ...
B. Scott Gaudi, Chang K., Cheongho Han, David S. Graff, Dominik M., Dominik M., Dominik M., Mao S., Richichi A., Schneider P., Schneider P., Schneider P., Udalski A., Udalski A., Wozniak P. R.   +14 more
core   +1 more source

First speckle interferometric measurements of binary stars at the Observatorio Astrofísico Guillermo Haro

, 2020
In this paper, we present the first multiband speckle interferometric measurements of binary stars performed using the 2.1 m telescope of the Observatorio Astrofísico Guillermo Haro, Cananea, Sonora, México.
C. A. Guerrero, F. Rosales-Ortega, G. Escobedo, J. Martínez, E. Castillo, P. Garcia-Flores, M. Nieto-Suárez   +6 more
semanticscholar   +1 more source

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Astrometric orbits of SB9 stars

, 2005
Hipparcos Intermediate Astrometric Data (IAD) have been used to derive astrometric orbital elements for spectroscopic binaries from the newly released Ninth Catalogue of Spectroscopic Binary Orbits (SB9).
A. Jorissen, Abt, Abt, Abt, Aikman, Barker, Batten, Beavers, Bertiau, Bopp, Bretz, Böhm-Vitense, C. Babusiaux, Carney, Chabrier, Christie, Crawford, D. Pourbaix, Duquennoy, Duquennoy, Eichhorn, Fekel, Franklin, Ginestet, Ginestet, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Griffin, Grobben, Jackson, Jones, Keenan, Latham, Latham, Lehmann, Lindegren, Luck, Lucy, Luyten, McClure, McClure, Nidever, Pan, Parsons, Plummer, Pourbaix, Pourbaix, Pourbaix, Pourbaix, Pourbaix, Radford, Reimers, Ryabchikova, S. Jancart, Scarfe, Scarfe, Scarfe, Scargle, Spencer Jones, Taylor, Tokovinin, van Leeuwen, Wilson, Wolff, Wright, Wright, Young   +82 more
core   +1 more source

The orbits of the quadruple star system 88 Tau A from PHASES differential astrometry and radial velocity [PDF]

, 2007
We have used high precision differential astrometry from the Palomar High-precision Astrometric Search for Exoplanet Systems (PHASES) project and radial velocity measurements covering a time-span of 20 years to determine the orbital parameters of the 88 ...
Balega I. I., Benjamin F. Lane, Bernard F. Burke, Bopp B. W., Burkhart C., Fabrycky D., Francis C. Fekel, Huenemoerder D. P., M. M. Colavita, M. Shao, Maciej Konacki, Matthew W. Muterspaugh, Michael Williamson, S. R. Kulkarni, Scarfe C. D., Schoeller M., Stanley Browne, Strassmeier K. G.   +17 more
core   +3 more sources

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

Gaia Search for Stellar Companions of TESS Objects of Interest V

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties.
Markus Mugrauer, Ann‐Kathrin Kollak, Lara Pietsch, Kai‐Uwe Michel   +3 more
wiley   +1 more source