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Orbits and Dynamical Masses for Six Binary Systems in the Hyades Cluster
Torres, Guillermo; Latham, David W.; Klement, Robert +8 more
We report long-baseline interferometric observations with the CHARA Array that resolve six previously known double-lined spectroscopic binary systems in the Hyades cluster, with orbital periods ranging from 3 to 358 days: HD 27483, HD 283882, HD 26874, HD 27149, HD 30676, and HD 28545. We combine those observations with new and existing radial-vel…
CME Arrival Time Prediction Based on Coronagraph Observations and Machine-learning Techniques
Shen, Fang; Yang, Yi; Li, Yucong +2 more
The timely and precise prediction of the arrival time of coronal mass ejections (CMEs) is crucial in mitigating their potential adverse effects. In this study, we present a novel prediction method utilizing a deep-learning framework coupled with physical characteristics of CMEs and background solar wind. Time series images from synchronized solar …
An Informed and Systematic Method to Identify Variable Mid-L Dwarfs
Karalidi, Theodora; Manjavacas, Elena; Faherty, Jacqueline K. +3 more
Most brown dwarfs show some level of photometric or spectral variability. However, finding the most variable dwarfs more suited for a thorough variability monitoring campaign remained a challenge until a few years ago with the design of spectral indices to find the most likely L and T dwarfs using their near-infrared (NIR) single-epoch spectrum. I…
The Second Case of a Major Merger Triggering a Starburst in a Green Pea Galaxy
Ghosh, T.; Malhotra, S.; Rhoads, J. +4 more
We have used the Karl G. Jansky Very Large Array (VLA) to map H I 21 cm emission from the Green Pea galaxy GP J1148+2546 at z ≈ 0.0451, only the second measurement of the H I spatial distribution of a Green Pea. The VLA H I 21 cm image, the DECaLS optical image, and Sloan Digital Sky Survey spectroscopy show that GP J1148+2546 has two neighbors, t…
An Inward-moving and Asymmetric Velocity Wave Detected in LAMOST-Gaia
Zhao, Gang; Chen, Yuqin; Wu, Wenbo +3 more
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 LAMOST-Gaia, we detect numerous ridges and undulations in the R-V ϕ diagram coded by median …
A Multiwavelength Portrait of the 3C 220.3 Lensed System
Azadi, Mojegan; Wilkes, Belinda J.; Worrall, D. M. +10 more
The 3C 220.3 system is a rare case of a foreground narrow-line radio galaxy ("galaxy A," z A = 0.6850) lensing a background submillimeter galaxy (z SMG = 2.221). New spectra from MMT/Binospec confirm that the companion galaxy ("galaxy B") is part of the lensing system with z B = 0.6835. New three-color Hubble S…
Expansion Properties of the Young Supernova Type Iax Remnant Pa 30 Revealed
Kulkarni, S. R.; Raymond, John C.; Caiazzo, Ilaria +14 more
The recently discovered Pa 30 nebula, the putative type Iax supernova remnant associated with the historical supernova of 1181 AD, shows puzzling characteristics that make it unique among known supernova remnants. In particular, Pa 30 exhibits a complex morphology, with a unique radial and filamentary structure, and it hosts a hot stellar remnant …
Properties of Galactic B[e] Supergiants. X. Refined Orbit and Fundamental Parameters of the HD 327083 Binary System
Miroshnichenko, A. S.; Manset, N.; Zharikov, S. V. +5 more
HD 327083 is a binary system that consists of two supergiant components and exhibits the B[e] phenomenon. In this paper, we report the determination of a new set of the system's fundamental parameters using a combination of photometric and spectroscopic data as well as the Gaia EDR3 distance. We found that the orbital period of the system is 107.6…
Visual Orbits of Wolf–Rayet Stars. II. The Orbit of the Nitrogen-rich Wolf–Rayet Binary WR 138 Measured with the CHARA Array
Moffat, Anthony F. J.; Monnier, John D.; Schaefer, Gail H. +19 more
Classical Wolf–Rayet (WR) stars are descendants of massive OB-type stars that have lost their hydrogen-rich envelopes and are in the final stages of stellar evolution, possibly exploding as Type Ib/c supernovae. It is understood that the mechanisms driving this mass loss are either strong stellar winds and or binary interactions, so intense studie…
Exploration of a Dissolving Association Made Up of IC 2602, Tucana–Horologium, and Other Young Comoving Groups
Kiman, Rocio; Faherty, Jacqueline K.; Gagné, Jonathan +11 more
Recently Gagné et al. suggested that young moving groups with similar kinematic properties could be part of larger dissolving structures. One example was IC 2602 as the core of a group of associations, including its corona (CIC 2602), Tucana-Horologium (THA), and parts of Theia 92. We explore this hypothesis by measuring the rotation periods of 95…