Results 21 to 30 of about 2,833,165 (330)
The Astronomical Journal, 2023 The accuracy of stellar distances inferred purely from parallaxes degrades rapidly with distance. Proper motion measurements, when combined with some idea of typical velocities, provide independent information on stellar distances.
C. A. L. Bailer-Jones
doaj +1 more source
Unresolved stellar companions with Gaia DR2 astrometry [PDF]
Monthly notices of the Royal Astronomical Society, 2020 For stars with unresolved companions, motions of the centre of light and that of mass decouple, causing a single-source astrometric model to perform poorly.
V. Belokurov +11 more
semanticscholar +1 more source
galstreams: A Library of Milky Way Stellar Stream Footprints and Tracks [PDF]
, 2022 Nearly a hundred stellar streams have been found to date around the Milky Way and the number keeps growing at an ever faster pace. Here we present the galstreams library, a compendium of angular position, distance, proper motion and radial velocity track
C. Mateu
semanticscholar +1 more source
Hierarchical Probabilistic Inference of the Color–Magnitude Diagram and Shrinkage of Stellar Distance Uncertainties [PDF]
, 2017 We present a hierarchical probabilistic model for improving geometric stellar distance estimates using color–magnitude information. This is achieved with a data-driven model of the color–magnitude diagram, not relying on stellar models but instead on the
B. Leistedt, D. Hogg
semanticscholar +1 more source
The Astrophysical Journal, 2023 The tip of the red giant branch (TRGB) is an apparent discontinuity of the luminosity function (LF) due to the end of the red giant evolutionary phase and is used to measure distances in the local universe.
J. Wu +7 more
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On Cepheid Distance Scale Bias Due to Stellar Companions and Cluster Populations [PDF]
Astrophysical Journal, 2017 State-of-the-art photometric measurements of extragalactic Cepheids account for the mean additional light due to chance superposition of Cepheids on crowded backgrounds through the use of artificial star measurements. However, light from stars physically
R. Anderson, A. Riess
semanticscholar +1 more source
A Catalog of Distance Determinations for the LAMOST DR8 K Giants in the Galactic Halo
The Astronomical Journal, 2023 We present a catalog of distances for 19,544 K giants drawn from Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR8. Most of them are located in the halo of the Milky Way up to ∼120 kpc.
Lan Zhang +6 more
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Measuring Distance and Properties of the Milky Way’s Central Supermassive Black Hole with Stellar Orbits [PDF]
, 2008 We report new precision measurements of the properties of our Galaxy’s supermassive black hole. Based on astrometric (1995-2007) and radial velocity (RV; 2000-2007) measurements from the W. M.
A. Ghez +14 more
semanticscholar +1 more source
ORBITS, DISTANCE, AND STELLAR MASSES OF THE MASSIVE TRIPLE STAR σ ORIONIS [PDF]
, 2016 We present interferometric observations of the σ Orionis triple system using the CHARA Array, NPOI, and VLTI. Using these measurements, we spatially resolve the orbit of the close spectroscopic binary (Aa,Ab) for the first time and present a revised ...
G. Schaefer +13 more
semanticscholar +1 more source
The Extragalactic Distance Database: The Color–Magnitude Diagrams/Tip of the Red Giant Branch Distance Catalog [PDF]
, 2021 The Extragalactic Distance Database (EDD) was created as a repository for high-quality, redshift-independent distances. A key component of EDD is the Color–Magnitude Diagrams/Tip of the Red Giant Branch (CMDs/TRGB) catalog, which provides information on ...
G. Anand +9 more
semanticscholar +1 more source