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Dynamical masses across the Hertzsprung-Russell diagram
Ting, Yuan-Sen; Cheng, Sihao; Speagle, Joshua S. +1 more
We infer the dynamical masses of stars across the Hertzsprung-Russell (H-R) diagram using wide binaries from the Gaia survey. Gaia's high-precision astrometry measures the wide binaries' orbital motion, which contains the mass information. Using wide binaries as the training sample, we measure the mass of stars across the 2D H-R diagram using the …
Velocity-space Signatures of Resonant Energy Transfer between Whistler Waves and Electrons in the Earth's Magnetosheath
Verscharen, Daniel; Klein, Kristopher G.; Li, Hui +4 more
Wave-particle interactions play a crucial role in transferring energy between electromagnetic fields and charged particles in space and astrophysical plasmas. Despite the prevalence of different electromagnetic waves in space, there is still a lack of understanding of fundamental aspects of wave-particle interactions, particularly in terms of ener…
High-resolution X-Ray Spectroscopy of Interstellar Iron toward Cygnus X-1 and GX 339-4
Lee, Julia C.; Paerels, Frits; Gatuzz, Efrain +7 more
We present a high-resolution spectral study of Fe L-shell extinction by the diffuse interstellar medium (ISM) in the direction of the X-ray binaries Cygnus X-1 and GX 339–4, using the XMM-Newton reflection grating spectrometer. The majority of interstellar Fe is suspected to condense into dust grains in the diffuse ISM, but the compounds formed fr…
The kinematics of Polycyclic Aromatic Hydrocarbons (PAHs) in Galaxies revealed by Principal Component Analysis (PCA) tomography with JWST/NIRSpec
Rigopoulou, Dimitra; García-Bernete, Ismael; Donnan, Fergus R
Polycyclic Aromatic Hydrocarbons (PAHs) are organic molecules which comprise the smallest particles of dust in the interstellar medium (ISM). Due to their broad/complex emission profiles, obtaining kinematics is a challenge with traditional methods, especially before the advent of the JWST. In this work, we employ Principal Component Analysis (PCA…
Circumstellar Disk Accretion Across the Lagoon Nebula: The Influence of Environment and Stellar Mass
Howell, Steve B.; Cody, Ann Marie; Beccari, Giacomo +9 more
Pre-main-sequence disk accretion is pivotal for determining the final stellar properties and the early conditions for close-in planets. We aim to establish the impact of internal (stellar mass) and external (radiation field) parameters on the disk evolution in the Lagoon Nebula massive star-forming region. We employ simultaneous u, g, r, i, Hα tim…
Quality flags for GSP-Phot Gaia DR3 astrophysical parameters with machine learning: effective temperatures case study
Zhao, Gang; Kovaleva, Dana A.; Avdeeva, Aleksandra S. +1 more
Gaia Data Release 3 (DR3) provides extensive information on the astrophysical properties of stars, such as effective temperature, surface gravity, metallicity, and luminosity, for over 470 million objects. However, as Gaia's stellar parameters in GSP-Phot module are derived through model-dependent methods and indirect measurements, it can lead to …
The Leakage of Lyman-continuum Photons from a Major Merger at z ∼ 1
Saha, Kanak; Herenz, Edmund Christian; Maulick, Soumil +1 more
We report the detection of Lyman-continuum (LyC) photons from a massive interacting system at z = 1.097 in the Hubble Ultra Deep Field. The LyC detection is made in the far-ultraviolet F154W band of the UVIT telescope on board AstroSat. Both JWST and Hubble Space Telescope (HST) imaging of the system reveal signs that it is a likely merger. In par…
Probing the physical properties of the intergalactic medium using SRG/eROSITA spectra from blazars
Wilms, J.; Gatuzz, E.; Hämmerich, S. +1 more
Most baryonic matter resides in the intergalactic medium (IGM). This diffuse gas is primarily composed of ionized hydrogen and helium and fills the space between galaxies. Observations of this environment are crucial for better understanding the physical processes in it. We present an analysis of the IGM absorption using blazar spectra from the fi…
Peering into the Wolf-Rayet phenomenon through [WO] and [WC] stars
Toalá, Jesús A.; Todt, Helge; Sander, Andreas A. C.
Spectroscopic observations have shown for decades that the Wolf-Rayet (WR) phenomenon is ubiquitous among stars with different initial masses. Although much effort to understand the winds from massive WR stars has been presented in the literature, not much has been done for such type of stars in the low-mass range. Here we present an attempt to un…
A dynamic view of V Hydrae. Monitoring of a spectroscopic-binary AGB star with an alkaline jet
Jorissen, A.; Planquart, L.; Escorza, A. +2 more
Context. The well studied carbon star V Hydrae is known to exhibit a complex asymmetric environment made of a dense equatorial wind and high-velocity outflows, hinting at its transition from the AGB phase to the asymmetric planetary nebula phase. In addition, V Hydrae also exhibits a long secondary period of 17 yr in its light curve, suggesting th…