Zobrazeno 1 - 10
of 1 784
pro vyhledávání: '"Stellar kinematics"'
Autor:
Jakob Stegmann, Alejandro Vigna-Gómez, Antti Rantala, Tom Wagg, Lorenz Zwick, Mathieu Renzo, Lieke A. C. van Son, Selma E. de Mink, Simon D. M. White
Publikováno v:
The Astrophysical Journal Letters, Vol 972, Iss 2, p L19 (2024)
A substantial fraction of stars can be found in wide binaries with projected separations between ∼10 ^2 and 10 ^5 au. In the standard lore of binary physics, these would evolve as effectively single stars that remotely orbit one another on stationa
Externí odkaz:
https://doaj.org/article/ae1d40135b914cfa9f7c5423ad573e29
Publikováno v:
The Astrophysical Journal Letters, Vol 965, Iss 1, p L9 (2024)
The Milky Way is widely considered to exhibit features of a rotational bar or quadrupole bar. In either case, the feature of the resonance of the Galactic bar should be present in the properties of the chemistry and kinematics, over a large area of t
Externí odkaz:
https://doaj.org/article/4a5678495e624c81939a953c5e68e741
Publikováno v:
The Astrophysical Journal Letters, Vol 961, Iss 1, p L4 (2024)
The phase space, as coded by kinematic parameters and chemical abundances, is crucial for understanding the formation of the Galactic disk. Using red giant stars from the Galactic thin disk with [Fe/H] > − 0.8 and low- α ratios identified in LAMOS
Externí odkaz:
https://doaj.org/article/17c9df5617c94e568f38018da1405673
Publikováno v:
The Astronomical Journal, Vol 168, Iss 5, p 204 (2024)
We investigate the evolutionary stages of four open clusters—Berkeley 39, Collinder 261, NGC 6819, and NGC 7789—of ages ranging from 1.6 to 6 Gyr. These clusters have previously been classified into dynamically young and intermediate age groups b
Externí odkaz:
https://doaj.org/article/24b2c2979bf64c5f87424ec9bb6192c7
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 2, p 149 (2024)
We present a stellar dynamical mass measurement of the supermassive black hole in the elliptical (E1) galaxy NGC 3258. Our findings are based on integral field unit spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE) observations in narrow
Externí odkaz:
https://doaj.org/article/d23c2eeee5094ea09aa790243cee5b31
Autor:
Chih-Chun Hsu, Adam J. Burgasser, Christopher A. Theissen, Jessica L. Birky, Christian Aganze, Roman Gerasimov, Sarah J. Schmidt, Cullen H. Blake, Kevin R. Covey, Elizabeth Moreno-Hilario, Christopher R. Gelino, Javier Serna, Joel R. Brownstein, Katia Cunha
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 274, Iss 2, p 40 (2024)
We present precise measurements of radial (RV) and projected rotational ( $v\sin i$ ) velocities of a sample of 258 M6 to L2 dwarfs with multiepoch, high-resolution ( λ /Δ λ = 22,500), near-infrared (1.514–1.696 μ m) spectroscopic observations
Externí odkaz:
https://doaj.org/article/2d566a9a22f047eda558d614d6083c55
Autor:
Kevin A. McKinnon, Andrés del Pino, Constance M. Rockosi, Miranda Apfel, Puragra Guhathakurta, Roeland P. van der Marel, Paul Bennet, Mark A. Fardal, Mattia Libralato, Sangmo Tony Sohn, Eduardo Vitral, Laura L. Watkins
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 150 (2024)
We present a hierarchical Bayesian pipeline, BP3M , that measures positions, parallaxes, and proper motions (PMs) for cross-matched sources between Hubble Space Telescope (HST) images and Gaia—even for sparse fields ( N _* < 10 per image)—expandi
Externí odkaz:
https://doaj.org/article/4a9a49364b194c98af756b823c3e0ce1
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 70 (2024)
The escape velocity profile of the Milky Way offers a crucial and independent measurement of its underlying mass distribution and dark matter (DM) properties. Using a sample of stars from the third data release of Gaia with 6D kinematics and strict q
Externí odkaz:
https://doaj.org/article/20f595b7cc4e443abd04fdf9094d63ad
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 35 (2024)
Chemical anomalies in planet-hosting stars (PHSs) are studied in order to assess how the planetary nature and multiplicity affect the atmospheric chemical abundances of their host stars. We employ APOGEE DR17 to select thin-disk stars of the Milky Wa
Externí odkaz:
https://doaj.org/article/f07d5b7f7cfa4b639ff4fb48a503f5a5
Publikováno v:
The Astronomical Journal, Vol 168, Iss 2, p 79 (2024)
Studying the structures of open clusters is crucial for understanding stellar evolution and galactic dynamics. Based on Gaia DR3 data, we apply the hierarchical clustering algorithm to the young open cluster NGC 6530 and group its members into five s
Externí odkaz:
https://doaj.org/article/cc8e81a4b9ca45bcb6f6aba87ce8e5e8