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Wind-line Variability and Intrinsic Errors in Observational Mass-loss Rates
Massa, Derck; Oskinova, Lidia M.; Prinja, Raman K.
UV wind-line variability in OB stars appears to be universal. In order to quantify this variation and to estimate its effect on a mass-loss rate determined from a single observation, we use the International Ultraviolet Explorer archive to identify nonpeculiar OB stars with well-developed but unsaturated Si IV λ1400 doublets and at least 10 indepe…
Pre-impact Thermophysical Properties and the Yarkovsky Effect of NASA DART Target (65803) Didymos
Kolb, Ulrich C.; Daly, R. Terik; Rivkin, Andrew S. +8 more
The NASA Double Asteroid Redirection Test (DART) spacecraft impacted the secondary body of the binary asteroid (65803) Didymos on 2022 September 26 and altered its orbit about the primary body. Before the DART impact, we performed visible and mid-infrared observations to constrain the pre-impact thermophysical properties of the Didymos system and …
The April 2023 SYM-H = −233 nT Geomagnetic Storm: A Classical Event
Henri, Pierre; Hajra, Rajkumar; Horne, Richard B. +8 more
The 23-24 April 2023 double-peak (SYM-H intensities of −179 and −233 nT) intense geomagnetic storm was caused by interplanetary magnetic field southward component Bs associated with an interplanetary fast-forward shock-preceded sheath (Bs of 25 nT), followed by a magnetic cloud (MC) (Bs of 33 nT), respectively. The…
Kinematics and star formation of hub-filament systems in W49A
Li, Dalei; Tang, Xindi; Zhou, Jianjun +11 more
Aims: W49A is a prominent giant molecular cloud (GMC) that exhibits strong star formation activities, yet its structural and kinematic properties remain uncertain. Our study aims to investigate the large-scale structure and kinematics of W49A, and elucidate the role of filaments and hub-filament systems (HFSs) in its star formation activity. …
Solar Energetic Proton Fluxes in Near-Earth Space on March 13-23, 2023
Vlasova, N. A.; Bazilevskaya, G. A.; Ginzburg, E. A. +5 more
The results of studying the fluxes of solar protons with energies greater than 5 MeV in near-Earth space on March 13-23, 2023, are presented. The features of the period under study are no visible solar flare with which the beginning of the event could be associated and an untypical time profile of proton fluxes, as well as a long duration of the e…
Diffuse interstellar bands in the near-infrared: expanding the reddening range
Najarro, F.; Geballe, T. R.; Garcia, M. +2 more
We have investigated the behaviour of three strong near-infrared diffuse interstellar bands (DIBs) at λ13177 Å, λ14680 Å, and λ15272 Å, on a larger sample of sightlines and over a wider range of extinctions than previously studied, utilizing spectra from three observatories. We applied two telluric correction techniques to reduce atmospheric conta…
Probing the strength of radial migration via churning by using metal-rich red giant stars from APOGEE
Kordopatis, Georges; Feltzing, Sofia; Lehmann, Christian +1 more
Making use of the APOGEE DR17 catalogue with high quality data for 143 509 red giant branch stars we explore the strength of different mechanisms that causes a star to radially migrate in the Milky Way stellar disc. At any position in the disc we find stars that are more metal-rich than the local interstellar medium. This is surprising and normall…
Production of s-process elements in asymptotic giant branch stars as revealed by Gaia/GSP-Spec abundances
Recio-Blanco, A.; de Laverny, P.; Contursi, G. +2 more
Context. The recent parameterisation by the GSP-Spec module of Gaia/Radial Velocity Spectrometer stellar spectra has produced an homogeneous catalogue of about 174 000 asymptotic giant branch (AGB) stars. Among the 13 chemical elements presented in this Gaia third data release, the abundance of two of them (cerium and neodymium) have been estimate…
The Massive and Distant Clusters of WISE Survey 2: A Stacking Analysis Investigating the Evolution of Star Formation Rates and Stellar Masses in Groups and Clusters
Alberts, Stacey; Connor, Thomas; Eisenhardt, Peter R. M. +8 more
The evolution of galaxies depends on their masses and local environments; understanding when and how environmental quenching starts to operate remains a challenge. Furthermore, studies of the high-redshift regime have been limited to massive cluster members, owing to sensitivity limits or small fields of view when the sensitivity is sufficient, in…
Short-term variability of the transitional pulsar candidate CXOU J110926.4‑650224 from X-rays to infrared
D'Avanzo, P.; Campana, S.; de Martino, D. +14 more
CXOU J110926.4‑650224 is a candidate transitional millisecond pulsar (tMSP) with X-ray and radio emission properties reminiscent of those observed in confirmed tMSPs in their X-ray 'subluminous' disc state. We present the results of observing campaigns that, for the first time, characterise the optical and near-infrared variability of this source …