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Photochemistry of HCl in the martian atmosphere
Krasnopolsky, Vladimir A.
The recent discovery of HCl in the martian atmosphere using the ExoMars Trace Gas Orbiter (Korablev et al., 2021, Sci. Adv. 7, eabe4386) during a global dust storm indicates a correlation between the HCl appearance and dust. Here this idea is studied using one-dimensional photochemical modeling on two summer midlatitude sites in the aphelion and p…
Galactic and stellar perturbations of long-period comet motion. Practical considerations
Dybczyński, Piotr A.; Breiter, Sławomir
Context. Thanks to our expanding knowledge of the Galactic and stellar neighborhood of the Solar System, modern long-period comet motion studies must take into account both stellar perturbations and the overall Galactic potential.
Aims: Our aim is to propose algorithms and methods that aid in performing numerical integrations of equations of …
A Deep Investigation of Two Poorly Studied Open Clusters Haffner 22 and Melotte 71 in the Gaia era
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +4 more
This paper presents a deep investigation of two open clusters, Haffner 22 and Melotte 71, using astrometric and photometric data from Gaia EDR3. We identified 382 and 597 most probable cluster members with membership probability higher than 50%. Mean proper motions in R.A. and decl. are estimated as (-1.631 ± 0.009, 2.889 ± 0.008) and (-2.398 ± 0.…
An edge-on orbit for the eccentric long-period planet HR 5183 b
Vanderburg, Andrew; Pearce, Logan A.; Venner, Alexander
The long-period giant planet HR 5183 b has one of the most extreme orbits among exoplanets known to date, and represents a test for models of their dynamical evolution. In this work, we use Hipparcos-Gaia astrometry to measure the orbital inclination of this planet for the first time and find $i=89.9^{+13.3\circ }_{-13.5}$, fully consistent with e…
The Long Stare at Hercules X-1. I. Emission Lines from the Outer Disk, the Magnetosphere Boundary, and the Accretion Curtain
Fabian, A. C.; Reynolds, C. S.; Pinto, C. +11 more
Hercules X-1 is a nearly edge-on accreting X-ray pulsar with a warped accretion disk, precessing with a period of about 35 days. The disk precession allows for unique and changing sightlines toward the X-ray source. To investigate the accretion flow at a variety of sightlines, we obtained a large observational campaign on Her X-1 with XMM-Newton (…
Thermal Comptonization in a Changing Corona in the Changing-look Active Galaxy NGC 1566
Dewangan, Gulab Chand; Tripathi, Prakash
We present broadband UV/X-ray spectral variability of the changing-look active galactic nucleus (AGN) NGC 1566, based on simultaneous near-ultraviolet and X-ray observations performed by the XMM-Newton, Swift, and NuSTAR satellites at five different epochs during the declining phase of the 2018 outburst. We found that the accretion disk, soft X-ra…
The detection of magnetic chemically peculiar stars using Gaia BP/RP spectra
Paunzen, E.; Prišegen, M.
Context. The magnetic chemically peculiar (mCP) stars of the upper main sequence are perfectly suited to studying the effects of rotation, diffusion, mass-loss, accretion, and pulsation in the presence of an organized stellar magnetic field. Therefore, many important models can only be tested with this star group.
Aims: In this case study we …
New evidences in IRDC G333.73 + 0.37: colliding filamentary clouds, hub-filament system, and embedded cores
Dewangan, L. K.
To unravel the star formation process, we present a multi-scale and multi-wavelength study of the filamentary infrared dark cloud (IRDC) G333.73 + 0.37, which hosts previously known two H II regions located at its center. Each H II region is associated with a mid-infrared source, and is excited by a massive OB star. Two filamentary structures and …
SOFIA/HAWC+ observations of the Crab Nebula: dust properties from polarized emission
Pattle, Kate; Kirchschlager, Florian; De Looze, Ilse +14 more
Supernova remnants (SNRs) are well-recognized dust producers, but their net dust production rate remains elusive due to uncertainties in grain properties that propagate into observed dust mass uncertainties, and determine how efficiently these grains are processed by reverse shocks. In this paper, we present a detection of polarized dust emission …
Estimating the Ages of Open Star Clusters from Properties of Their Extended Tidal Tails
Kroupa, Pavel; Jeřábková, Tereza; Šubr, Ladislav +1 more
The most accurate current methods for determining the ages of open star clusters, stellar associations, and stellar streams are based on isochrone fitting or the lithium depletion boundary. We propose another method for dating these objects based on the morphology of their extended tidal tails, which have been recently discovered around several op…