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Two stellar populations with different metallicities in the low-mass globular cluster Gran 5
Chung, Chul; Lee, Young-Wook; Koch-Hansen, Andreas J. +3 more
Context. With the increasing number of discoveries of globular clusters in the inner Milky Way, the need for spectroscopic confirmation and further investigation of their stellar populations and chemodynamical properties has become crucial. Aims. Gran 5 is a newly reported low-mass globular cluster located close to the Galactic center, and it is t…
BSN: The First Light Curve Analysis of the Total Eclipse Binary System EL Tuc
Poro, Atila; Sarvari, Elham; Fernández Lajús, Eduardo
We conducted the first light curve study of the binary star EL Tuc within the Binary Systems of South and North project's framework. The photometric observations were made using standard multiband BVR c I c filters at an observatory in Argentina. We presented a new ephemeris for EL Tuc and a linear fit to the O – C diagra…
Observations of the Ultraviolet-bright Star ZNG 1 in the Globular Cluster M5 (NGC 5904)
Dixon, William V.
We have analyzed archival spectra of the hot UV-bright star ZNG 1 in the globular cluster M5 (NGC 5904) obtained with the Far Ultraviolet Spectroscopic Explorer and the Space Telescope Imaging Spectrograph. From these data, we derive an effective temperature T eff = 43,000 ± 1400 K, a surface gravity $\mathrm{log}g$ = 4.47 ± 0.08, a rot…
Ages of "Singles" versus "Multis": Predictions for Dynamical Sculpting over Gyr in the Kepler Sample
Ballard, Sarah; Lam, Christopher
The sample of host stars with multiple transiting planets has illuminated the orbital architectures of exoplanetary systems. These architectures may be shaped mostly by formation conditions, be continually sculpted by ongoing dynamical processes, or both. As more studies have placed planet occurrence within a galactic context, evidence has emerged…
An Imaging and Spectroscopic Exploration of the Dusty Compact Obscured Nucleus Galaxy Zw 049.057
Gallagher, J. S.; Evans, A.; Privon, G. C. +9 more
Zw 049.057 is a moderate-mass, dusty, early-type galaxy that hosts a powerful compact obscured nucleus (CON, L FIR,CON ≥ 1011 L ⊙). The resolution of the Hubble Space Telescope enabled measurements of the stellar light distribution and characterization of dust features. Zw 049.057 is inclined with a prominent three…
Fermi-bubble Bulk and Edge Analysis Reveals Dust, Cooling Breaks, and Cosmic-Ray Diffusion, Facilitating a Self-consistent Model
Keshet, Uri; Gurwich, Ilya; Lavi, Assaf +2 more
The full, radio to γ-ray spectrum of the Fermi bubbles is shown to be consistent with standard strong-shock electron acceleration at the bubble edge, without the unnatural energy cutoffs and unrealistic electron cooling of previous studies, if the ambient interstellar radiation is strong; the γ-ray cooling break should then have a microwave counte…
Hunting for Hydrated Minerals on Trans-Neptunian Objects
Fraser, Wesley C.; Puzia, Thomas H.; Seccull, Tom +1 more
We present new optical reflectance spectra of three potentially silicate-rich trans-Neptunian objects (TNOs). These spectra were obtained with the aim of confirming past hints and detections of λ ∼ 0.7 µm absorption features associated with the presence of iron-bearing phyllosilicates. Our new spectrum of 120216 (2004 EW95) presen…
The Cluster Spacecrafts' View Of The Motion Of The High-Latitude Magnetopause
Darrouzet, Fabien; Plaschke, Ferdinand; Grimmich, Niklas +10 more
The magnetopause is the boundary between the interplanetary magnetic field and the terrestrial magnetic field. It is influenced by different solar-wind conditions, which lead to a change in the shape and location of the magnetopause. The interaction between the solar wind and the magnetosphere can be studied from in situ spacecraft observations. M…
Determining the Origin of Very-high-energy Gamma Rays from Galactic Sources by Future Neutrino Observations
Wang, Kai; Song, Bo-Heng; Huang, Tian-Qi
Recently, the Large High Altitude Air Shower Observatory (LHAASO) identified 12 gamma-ray sources emitting gamma rays with energies above 100 TeV, making them potential PeV cosmic-ray accelerators (PeVatrons). Neutrino observations are crucial in determining whether the gamma-ray radiation process is of hadronic or leptonic origin. In this paper, …
Benchmarking the spectroscopic masses of 249 evolved stars using asteroseismology with TESS
Huber, Daniel; Bedding, Timothy R.; Stello, Dennis +5 more
One way to understand planet formation is through studying the correlations between planet occurrence rates and stellar mass. However, measuring stellar mass in the red giant regime is very difficult. In particular, the spectroscopic masses of certain evolved stars, often referred to as 'retired A-stars', have been questioned in the literature. Ef…