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The Solar Cycle Temporal Variation of the Solar Wind Charge Exchange X-Ray Lines
Kaaret, Philip; Bregman, Joel N.; Qu, Zhijie +2 more
Solar wind charge exchange (SWCX) is the primary contamination of soft X-ray emission lines from the Milky Way (MW) hot gas. We report a solar cycle (≈10 yr) temporal variation of observed O VII and O VIII emission line measurements in the XMM-Newton archive, which is tightly correlated with the solar cycle traced by the sunspot number (SSN). This…
Stumbling over Planetary Building Blocks: AU Microscopii as an Example of the Challenge of Retrieving Debris-disk Dust Properties
Weinberger, Alycia J.; Arnold, Jessica A.; Videen, Gorden +1 more
We explore whether assumptions about dust grain shape affect the resulting estimates of the composition and grain size distribution of the AU Microscopii (AU Mic) debris disk from scattered-light data collected by Lomax et al. The near edge-on orientation of the AU Mic debris disk makes it ideal for studying the effect of the scattering phase func…
A triple star origin for T Pyx and other short-period recurrent novae
Knigge, C.; Toonen, S.; Boekholt, T. C. N.
Recurrent novae are star systems in which a massive white dwarf accretes material at such a high rate that it undergoes thermonuclear runaways every 1-100 yr. They are the only class of novae in which the white dwarf can grow in mass, making some of these systems strong Type Ia supernova progenitor candidates. Almost all known recurrent novae are …
The Baltimore Oriole's Nest: Cool Winds from the Inner and Outer Parts of a Star-forming Galaxy at z = 1.3
Barro, Guillermo; Weiner, Benjamin J.; Pacifici, Camilla +12 more
Strong galactic winds are ubiquitous at z ≳ 1. However, it is not well-known where inside galaxies these winds are launched from. We study the cool winds (~104 K) in two spatial regions of a massive galaxy at z = 1.3, which we nickname the "Baltimore Oriole's Nest." The galaxy has a stellar mass of 1010.3±0.3 M ⊙, …
Analytical determination of orbital elements using Fourier analysis. II. Gaia astrometry and its combination with radial velocities
Ségransan, D.; Delisle, J. -B.
The ESA global astrometry space mission Gaia has been monitoring the position of a billion stars since 2014. The analysis of such a massive dataset is challenging in terms of the data processing involved. In particular, the blind detection and characterization of single or multiple companions to stars (planets, brown dwarfs, or stars) using Gaia a…
The Coupling of an EUV Coronal Wave and Ion Acceleration in a Fermi-LAT Behind-the-Limb Solar Flare
Krucker, Säm; Veronig, Astrid M.; Warmuth, Alexander +6 more
We present the Fermi-LAT observations of the behind-the-limb (BTL) flare of 2021 July 17 and the joint detection of this flare by STIX on board the Solar Orbiter. The separation between Earth and the Solar Orbiter was 99.°2 at 05:00 UT, allowing STIX to have a front view of the flare. The location of the flare was S20E140 in Stonyhurst heliographi…
Primary and albedo protons detected by the Lunar Lander Neutron and Dosimetry experiment on the lunar farside
Xu, Zigong; Guo, Jingnan; Wimmer-Schweingruber, Robert F. +4 more
The Lunar Lander Neutron and Dosimetry (LND) Experiment aboard the Chang'E-4 Lander on the lunar far-side measures energetic charged and neutral particles and monitors the corresponding radiation levels. During solar quiet times, galactic cosmic rays (GCRs) are the dominating component of charged particles on the lunar surface. Moreover, the inter…
High-velocity Stars in SDSS/APOGEE DR17
Pereira, C. B.; Cunha, K.; Majewski, S. R. +7 more
We report 23 stars having Galactocentric velocities larger than 450 km s-1 in the final data release of the APOGEE survey. This sample was generated using space velocities derived by complementing the high-quality radial velocities from the APOGEE project in Sloan Digital Sky Survey's Data Release 17 (DR17) with distances and proper mot…
An analysis of the most distant cataloged open clusters. Re-assessing fundamental parameters with Gaia EDR3 and ASteCA
Perren, G. I.; Pera, M. S.; Navone, H. D. +1 more
Context. Several studies have been presented in the last few years applying some kind of automatic processing of data to estimate the fundamental parameters of open clusters. These parameters are then employed in larger scale analyses, for example the structure of the Galaxy's spiral arms. The distance is one of the most straightforward parameters…
A Census of Above-horizontal-branch Stars in Galactic Globular Clusters
Bond, Howard E.; Ciardullo, Robin; Siegel, Michael H. +1 more
We have carried out a search for above-horizontal-branch (AHB) stars-objects lying above the horizontal branch (HB) and blueward of the asymptotic giant branch (AGB) in the color-magnitude diagram-in 97 Galactic and seven Magellanic Cloud globular clusters (GCs). We selected AHB candidates based on photometry in the uBVI system, which is optimized…