Results 51 to 60 of about 241,854 (224)

Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop

Astronomische Nachrichten, Volume 343, Issue 6-7, July-August., 2022
Abstract The relative Rectilinear motion of optical double stars provides an important clue to the relationship of the components. We provide an objective method of confirming the optical status of double stars, and of obtaining unbiased rectilinear elements solely on data obtained from the HIPPARCOS and Gaia DR2 space missions. We apply this technique
Roderick R. Letchford, Graeme L. White, Carolyn J. Brown   +2 more
wiley   +1 more source

Triage of the Gaia DR3 astrometric orbits. I. A sample of binaries with probable compact companions [PDF]

, 2022
In preparation for the release of the astrometric orbits of Gaia, Shahaf et al. (2019) proposed a triage technique to identify astrometric binaries with compact companions based on their astrometric semi-major axis, parallax, and primary mass. The technique requires the knowledge of the appropriate mass-luminosity relation to rule out single or close ...
arxiv   +1 more source

Gaia search for stellar companions of TESS Objects of Interest III

Astronomische Nachrichten, Volume 343, Issue 6-7, July-August., 2022
Abstract The latest results from our ongoing multiplicity study of (Community) TESS Objects of Interest are presented, using astro‐ and photometric data from the ESA‐Gaia mission, to detect stellar companions of these stars and characterize their properties.
Markus Mugrauer, Jule Zander, Kai‐Uwe Michel   +2 more
wiley   +1 more source

Follow‐up observations of the binary system γ Cep

Astronomische Nachrichten, Volume 343, Issue 5, June 2022., 2022
Abstract We present follow‐up imaging and spectroscopic observations of the exoplanet host star γ Cep A, and of its low‐mass stellar companion γ Cep B. We used the lucky‐imager AstraLux at the Calar Alto observatory to follow the orbital motion of the companion around its primary, whose radial velocity (RV) was determined with spectra of the star ...
Markus Mugrauer, Saskia Schlagenhauf, Sven Buder, Christian Ginski, Matilde Fernández   +4 more
wiley   +1 more source

Constraining stellar and orbital co-evolution through ensemble seismology of solar-like oscillators in binary systems. A census of oscillating red giants and dwarf stars in Gaia DR3 binaries

Astronomy & Astrophysics, 2023
Binary systems constitute a valuable astrophysics tool for testing our understanding of stellar structure and evolution. Systems containing at least one oscillating component are interesting in this regard because asteroseismology offers independent ...
P. G. Beck, D. Grossmann, L. Steinwender, L. Schimak, N. Muntean, M. Vrard, R. A. Patton, J. Merc, S. Mathur, R. García, M. Pinsonneault, D. Rowan, P. Gaulme, C. Allende Prieto, K. Z. Arellano-C'ordova, L. Cao, E. Corsaro, O. Creevey, K. Hambleton, A. Hanslmeier, B. Holl, J. Johnson, S. Mathis, D. Godoy-Rivera, S. Simón-Díaz, J. Zinn   +25 more
semanticscholar   +1 more source

The Geophysical Environment of (486958) Arrokoth—A Small Kuiper Belt Object Explored by New Horizons

Journal of Geophysical Research: Planets, Volume 127, Issue 6, June 2022., 2022
Abstract NASA's New Horizons mission performed the first flyby of a small Kuiper Belt Object (KBO), (486958) Arrokoth on 1 January 2019. The fast flyby revealed a fascinating, flattened, contact binary replete with a variety of unexpected geologic terrains.
James T. Keane, Simon B. Porter, Ross A. Beyer, Orkan M. Umurhan, William B. McKinnon, Jeffrey M. Moore, John R. Spencer, S. Alan Stern, Carver J. Bierson, Richard P. Binzel, Douglas P. Hamilton, Carey M. Lisse, Xiaochen Mao, Silvia Protopapa, Paul M. Schenk, Mark R. Showalter, John A. Stansberry, Oliver L. White, Anne J. Verbiscer, Joel W. Parker, Catherine B. Olkin, Harold A. Weaver, Kelsi N. Singer   +22 more
wiley   +1 more source

Spatial and Binary Parameter Distributions of Black Hole Binaries in the Milky Way Detectable with Gaia

The Astrophysical Journal, 2023
Soon after Gaia Data Release 3 (DR3) in 2022 June, some candidates (and one confirmed) of detached black hole (BH)–luminous companion (LC) binaries have been reported.
Minori Shikauchi, Daichi Tsuna, Ataru Tanikawa, Norita Kawanaka   +3 more
doaj   +1 more source

Orbital Elements of visual binary stars with very short arcs: With application to double stars from the 1829 southern double star catalog of James Dunlop

Astronomische Nachrichten, Volume 343, Issue 3, March 2022., 2022
Abstract Binary double stars are those whose binding energies are less than zero. Obtaining binary star orbits from short arcs has been a long‐standing problem in astrophysics. A method is presented and tested here, which addresses the problem by using space‐based astrometry, photometry, and astrophysical data, together with historic measures, to ...
Roderick R. Letchford, Graeme L. White, Carolyn J. Brown   +2 more
wiley   +1 more source

Autonomous orbit determination and timekeeping in lunar distant retrograde orbits by observing X‐ray pulsars

NAVIGATION, Volume 68, Issue 4, Page 687-708, Winter 2021., 2021
Abstract A server satellite that is parked in a stable distant retrograde orbit (DRO) in the vicinity of the Moon can provide navigation service for satellites in the Earth–Moon system. In this study, X‐ray pulsar navigation (XPNAV) is investigated to determine the server's orbital position and velocity, and maintain its onboard timing autonomously to ...
Jiangkai Liu, Wenbin Wang, Hao Zhang, Leizheng Shu, Yang Gao   +4 more
wiley   +1 more source

Precision Astrometry of a Sample of Speckle Binaries and Multiples with the Adaptive Optics Facilities at the Hale and Keck II Telescopes [PDF]

, 2009
Using the adaptive optics facilities at the 200-in Hale and 10-m Keck II, we observed in the near infrared a sample of 12 binary and multiple stars and one open cluster. We used the near diffraction limited images of these systems to measure the relative
Al-Shukri, Barstow, Benedict, Benedict, Cameron, Cutri, Delfosse, Dommanget, Dvorak, Eggenberger, Eisenhauer, Fischer, Han, Harmanec, Hayward, Heintz, Henry, He��miniak, Holman, J. Eisner, Jenkins, K. G. He��miniak, Lane, Launhardt, Law, Lissauer, M. Konacki, Metchev, Metchev, Mugrauer, Muterspaugh, Nelson, Neuh��user, Oppenheimer, Perryman, Pravdo, Pravdo, Raghavan, Reid, Roe, Roeser, R��ll, S. R. Kulkarni, Sahlmann, Simon, Simons, Stetson, S��derhjelm, Thompson, Unwin, Zapatero Osorio   +50 more
core   +2 more sources