Zobrazeno 1 - 10
of 3 057
pro vyhledávání: '"straggler"'
Publikováno v:
The Astrophysical Journal Letters, Vol 970, Iss 2, p L39 (2024)
We report the discovery of a barium blue straggler star (BSS) in M67, exhibiting enhancements in slow neutron-capture ( s -)process elements. Spectroscopic analysis of two BSSs (WOCS 9005 & WOCS 1020) and four stars located near the main-sequence tur
Externí odkaz:
https://doaj.org/article/b37259bd4fea4b299632628870eaa93a
Publikováno v:
Complex & Intelligent Systems, Vol 9, Iss 5, Pp 5199-5219 (2023)
Abstract Federated learning (FL) enables clients learning a shared global model from multiple distributed devices while keeping training data locally. Due to the synchronous update mode between server and devices, the straggler problem has become a s
Externí odkaz:
https://doaj.org/article/b75e0337d0084fa6883e5e7663783d5f
Publikováno v:
The Astronomical Journal, Vol 168, Iss 5, p 205 (2024)
NGC 2506 is a rich, intermediate-age (2.0 Gyr), metal-poor ([Fe/H] ∼ −0.2) open cluster. This work presents the results of 12,157 spectroscopic radial-velocity measurements of 2442 stars in the NGC 2506 field obtained over 41 yr, made as part of
Externí odkaz:
https://doaj.org/article/8886b7d3c8884d2689d9f32e34813fba
Publikováno v:
The Astronomical Journal, Vol 168, Iss 3, p 97 (2024)
We study the intermediate-age open cluster NGC 2627, located at a distance of ∼2 kpc, using UVIT/AstroSat and other archival data. Using a machine learning-based algorithm, ML-MOC, on the Gaia DR3 data, we identify 422 cluster members, including fo
Externí odkaz:
https://doaj.org/article/a19ff40bd72941198144a6a421c1f0a9
Autor:
Fengqing Yu, Ting S. Li, Joshua S. Speagle, Gustavo E. Medina, Sergey E. Koposov, Joss Bland-Hawthorn, Lara R. Cullinane, Gwendolyn M. Eadie, Denis Erkal, Geraint F. Lewis, Guilherme Limberg, Daniel B. Zucker
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 81 (2024)
Blue horizontal branch stars (BHBs), excellent distant tracers for probing the Milky Way’s halo density profile, are distinguished in the ${\left(g-r\right)}_{0}$ versus ( i − z ) _0 color space from another class of stars, blue straggler stars.
Externí odkaz:
https://doaj.org/article/dea9648807754bf8aefef0eaca25cd9b
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 1, p 80 (2024)
Motivated by measurements of the rotation speed of accretor stars in post-mass-transfer (post-MT) systems, we investigate how magnetic braking affects the spin-down of individual stars during binary evolution with the MESAbinary module. Unlike the co
Externí odkaz:
https://doaj.org/article/11d93aa97faf4e57979f6065a60508c7
Autor:
Li Wang, Licai Deng, Xiaoying Pang, Long Wang, Richard de Grijs, Antonino P. Milone, Chengyuan Li
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 21 (2024)
The presence of young stellar populations in the Large Magellanic Cloud cluster NGC 1783 has caught significant attention, with suggestions ranging from it being a genuine secondary stellar generation to a population of blue straggler stars or simply
Externí odkaz:
https://doaj.org/article/e4fd3a2c9f8045fe872baea2269be912
Wind Roche-lobe Overflow in Low-mass Binaries: Exploring the Origin of Rapidly Rotating Blue Lurkers
Autor:
Meng Sun, Sasha Levina, Seth Gossage, Vicky Kalogera, Emily M. Leiner, Aaron M. Geller, Zoheyr Doctor
Publikováno v:
The Astrophysical Journal, Vol 969, Iss 1, p 8 (2024)
Wind Roche-lobe overflow (WRLOF) is a mass-transfer mechanism proposed by Mohamed and Podsiadlowski for stellar binaries wherein the wind acceleration zone of the donor star exceeds its Roche-lobe radius, allowing stellar wind material to be transfer
Externí odkaz:
https://doaj.org/article/73ef1bd9e7db43a78bad7ec9289dcb4c
Autor:
S. Jane Arthur, Gloria Koenigsberger, Kristin Brady, Diana Estrella-Trujillo, Catherine Pilachowski
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 1, p 69 (2024)
The kinetic energy in tidal flows, when converted into heat, can affect the internal structure of a star and shift its location on a color–magnitude diagram from that of standard models. In this paper we explore the impact of injecting heat into st
Externí odkaz:
https://doaj.org/article/e0bd5ea51ec3401fb75ad53f3221ddf4